Standards Respecting Mobile Offshore Drilling Units

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TP 6472 E
Standards Respecting
Mobile Offshore
Drilling Units
1995
TP 6472E
STANDARDS RESPECTING
MOBILE OFFSHORE'DAILLING UNITS
- i -
CONTENTS
Page
PREAMBLE...................................................................................................................................1
STANDARDS RESPECTING
MOBILE OFFSHORE DRILLING UNITS
Section 1 .............................................................................................................................2
Short Title
Section 2 .............................................................................................................................2
Definitions
PART I
GENERAL.....................................................................................................................................9
Section 3 - Application...................................................................................................9
Section 4 - Responsibility...............................................................................................9
Section 5 - Equivalents...................................................................................................9
Section 6 - Submission of Plans and Data................................................................10
Section 7 - Plans and Data Required.........................................................................10
Section 8 - Inspection...................................................................................................15
Section 9 - Fees............................................................................................................17
Section 10 - Certification................................................................................................17
PART II
CONSTRUCTION, STRENGTH AND MATERIALS...........................................................19
Section 12 - General.......................................................................................................19
Section 13 - Design Loads............................................................................................19
Section 14 - Structural Analysis.....................................................................................20
Section 15 - Special Consideration for Surface Units................................................21
Section 16 - Special Consideration for Self-elevating Units......................................21
Section 17 - Special Consideration for Column Stabilized Units..............................23
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Section 18 - Construction Portfolio...............................................................................24
Section 19 - Materials and Welding..............................................................................24
PART III
INTACT AND DAMAGE STABILITY AND FREEBOARD..................................................25
Section 20 - Inclining Experiment..................................................................................25
Section 21 - Sample Loading Conditions....................................................................25
Section 22 - Allowable KG Curves................................................................................26
Section 23 - Righting Moment and Wind Heeling Moment Curves...........................26
Section 24 - Intact Stability Criteria...............................................................................30
Section 24 - Damage Stability.......................................................................................31
Section 26 - Permeability Factors.................................................................................31
Section 27 - Extent of Damage.....................................................................................31
Section 28 - Watertight Integrity.....................................................................................33
Section 29 - Internal Openings.......................................................................................34
Section 30 - External Openings.....................................................................................34
FREEBOARD.............................................................................................................................35
Section 31 - General.......................................................................................................35
Section 32 - Surface Units.............................................................................................36
Section 33 - Self-elevating Units...................................................................................36
Section 34 - Column Stabilized Units...........................................................................37
PART IV
MACHINERY INSTALLATIONS FOR ALL TYPES OF UNITS.........................................39
Section 35 - General.......................................................................................................39
Section 36 - Internal Combusiton Engines...................................................................40
Section 37 - Steam Boilers and Boiler Feed Systems...............................................41
Section 38 - Steam Pipe Systems................................................................................42
Section 39 - Machinery Controls...................................................................................42
Section 40 - Air Pressure Systems...............................................................................43
Section 41 - Oil Fuel, Lubricating Oil and Other Flammable Oils..............................43
- iii -
Section 42-44- Bilge and Ballast Arrangements.............................................................44
Section 45 - Air and Overflow Pipes.............................................................................48
Section 46 - Sounding Pipes.........................................................................................49
Section 47 - Draught Gauges........................................................................................49
Section 48 - Jacking and Self-Elevating Systems.......................................................49
PART V
ELECTRICAL INSTALLATIONS FOR ALL TYPES OF UNITS........................................51
Section 49 - General.......................................................................................................51
Section 50 - Main Source of Electrical Power.............................................................51
Section 51 - Emergency Source of Electrical Power..................................................52
Section 52 - Starting Arrangements for Emergency Generators...............................57
Section 53 - Precautions against Shock, Fire and Other Hazards of Electrical Origin
...................................................................................................................58
Section 54 - Internal Communication............................................................................61
PART VI
MACHINERY AND ELECTRICAL INSTALLATIONS IN HAZARDOUS LOCATIONS
FOR ALL TYPES OF UNITS...................................................................................................62
Section 55 - Electrical Installations in Hazardous Locations......................................62
Section 56 - Classification of Hazardous Locations...................................................65
Section 57 - Openings, Access and Ventilation Conditions Affecting the Extent of
Hazardous Locations..............................................................................67
Section 58 - Ventilation of Spaces................................................................................68
Section 59 - Emergency Shutdown Procedures..........................................................69
Section 60 - Machinery Installations in Hazardous Locations....................................69
Section 61 - Portable Structures in Hazardous Locations..........................................70
PART VII
MACHINERY AND ELECTRICAL INSTALLATIONS
FOR SELF PROPELLED UNITS...........................................................................................71
Section 62 - General.......................................................................................................71
Section 63 - Means of Going Astern.............................................................................72
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Section 64 - Steam Boiler and Boiler Feed Systems.................................................73
Section 65 - Propulsion Machinery Controls................................................................73
Section 66 - Steering Gear............................................................................................74
Section 67 - Electric and Electrohydraulic Steering Gear..........................................76
Section 68 - Communication between the Navigating Bridge and Engine Room...77
Section 69 - Engineers' Alarm.......................................................................................78
Section 70 - Main Source of Electrical Power.............................................................78
Section 71 - Emergency Source of Electrical Power..................................................78
Section 72 - Other Requirements..................................................................................79
PART VIII
PERIODICALLY UNATTENDED MACHINERY SPACES
FOR ALL TYPES OF UNITS...................................................................................................80
Section 73 - General.......................................................................................................80
Section 74 - Fire Prevention..........................................................................................80
Section 75 - Fire Detection............................................................................................81
Section 76 - Fire Fighting...............................................................................................82
Section 77 - Protection against Flooding.....................................................................82
Section 78 - Bridge Control of Propulsion Machinery.................................................83
Section 79 - Communication.........................................................................................84
Section 80 - Alarm System............................................................................................84
Section 81 - Special Requirements for Machinery, Boiler and Electrical Installations85
Section 83 - Other Requirements..................................................................................87
PART IX
FIRE SAFETY.............................................................................................................................88
Section 84 - Structural Fire Protection..........................................................................88
Section 85 - Fire Integrity of Bulkheads and Decks....................................................88
Section 86 - Protection of Accommodation Spaces, Service Spaces and Control
Stations....................................................................................................92
Section 87 - Means of Escape......................................................................................94
Section 88 - Ventilation Systems..................................................................................96
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Section 89 - Fire Pumps................................................................................................99
Section 90 - Fire Mains................................................................................................100
Section 91 - Hydrants, Hoses and Nozzles................................................................100
Section 92 - International Shore Connection..............................................................101
Section 93 - Fire Extinguishing Arrangements in Machinery Spaces and in Spaces
Containing Fired Processes................................................................102
Section 94 - Arrangements in Spaces Containing Internal Combustion Machinery103
Section 95 - Arrangements in Spaces Containing Steam Turbines or Enclosed
Steam Engines......................................................................................104
Section 96 - Arrangements in Other Machinery Spaces..........................................104
Section 97 - Fire Fighting Equipment in Accommodation Service and Working
Spaces...................................................................................................104
Section 98 - Fire Detection and Alarm System.........................................................105
Section 99 - Gas Detection and Alarm System.........................................................107
Section 100 - Arrangements for Ventilation and Oil Fuel Systems in Machinery and
Working Spaces....................................................................................107
Section 101 - Firefighter's Outfits.................................................................................107
Section 102 - Fire Extinguishers..................................................................................110
Section 103 - Fixed Fire Extinguishing Systems........................................................112
Section 104 - Storage of Gas Cylinders......................................................................112
Section 105 - Fire Control Plan....................................................................................113
Section 106 - Other Requirements...............................................................................114
PART X
LIFE SAVING EQUIPMENT...................................................................................................115
Section 107 -......................................................................................................................115
PART XI
RADIOCOMMUNICATION INSTALLATIONS....................................................................117
Section 108 -......................................................................................................................117
PART XII
LIFTING DEVICES..................................................................................................................118
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Section 109 -......................................................................................................................118
PART XIII
HELICOPTER FACILITIES....................................................................................................119
Section 110 -......................................................................................................................119
PART XIV
OPERATING REQUIREMENTS...........................................................................................120
Section 111 - Operating Manual...................................................................................120
Section 112 - Dangerous Goods.................................................................................123
Section 113 - Pollution Prevention...............................................................................124
Section 114 - Towing.....................................................................................................124
Section 115 - Transfer of Material and Equipment.....................................................124
Section 116 - Safety of Navigation...............................................................................125
- 1 -
PREAMBLE
TP-6472E
1.Recognising that some present domestic regulations do not refer specifically to
Mobile Offshore Drilling Units (MODUs), the Canadian Coast Guard (CCG) has adopted
the following Standards for the design, construction and operation of new Canadian
registered MODUs pursuant to paragraph 370(2)(a) of the Canada Shipping Act. Existing
Canadian registered MODUs shall comply with these Standards to the extent considered
reasonable and practicable by CCG.
2.The Standards have been based upon the International Maritime Organisation’s
(IMO) Code for the Construction and Equipment of Mobile Offshore Drilling Units. A
position has been defined for those areas in the IMO Code where the level of safety is
delegated to the Flag Administration. Additional requirements have also been included in
the Standards which have not been specifically addressed in the IMO Code. CW
considers these Standards as an equivalent to the technical requirements of the
international Convention for the Safety of Life at Sea, 1974 and the international
Convention on Load Lines, 1966.
3.The Standards do not include requirements for the drilling of or the procedures for
control of the subsea well. Notwithstanding that foreign drilling operations are subject to
the control of the Coastal State, Canadian registered MODus should comply in general
with the Canada Oil and Gas Lands Administration (COGLA) drilling equipment
requirements. The drilling operations of both foreign and Canadian registered MODUs
operating on Canada Lands shall be subject to the regulations administered by COGLA.
4.Recognising CCG's responsibility under the terms of the CCG/COGLA
Memorandum of Understanding, all foreign registered MODUs operating on Canada
Lands shall comply with these Standards as if they were Canadian registered units. (See
section 3 of Part I).
- 2 -
STANDARDS RESPECTING MOBILE OFFSHORE DRILLING UNITS
Short Title
1.These Standards may be cited as the Mobile Offshore Drilling Units
Standards.
Definitions
2.(1) In these Standards unless expressly provided otherwise the terms therein
have the meanings defined in the following paragraphs:
" ‘A' Class division" means a division as defined in the Hull Construction Regulations;
"accommodation spaces" means those spaces used for public spaces, corridors,
laboratories, cabins, offices, hospitals, cinemas, games and hobbies rooms, pantries
containing no cooking appliances and similar spaces; public spaces are those portions
of the accommodation which are used for halls, dining rooms, lounges and similar
permanently enclosed spaces;
"approved" means approved by the Board or approved in such a manner as the Board
may accept or direct;
"assigned working pressure" means the pressure at which the particular item of machinery
is approved to operate and in no case shall the assigned working pressure exceed the
design pressure;
"auxiliary steering system" means that equipment which is provided for effecting movement
of the rudder for the purpose of steering the unit in the event of failure of the main
steering gear;
" 'B' Class division" means a division as defined in the Hull Construction Regulations;
"Board" means the Board of Steamship Inspection;
"bottom founded unit" means a unit with the capability of lowering itself to and raising itself
from the seabed or berm;
" 'C' Class division" means a division as defined in the Hull Construction Regulations;
"C.S.A." means the Canadian Standards Association;
- 3 -
"Canada Lands` means the territory and the offshore region North of 60 degrees, the East
and West Coast offshore regions to the limits of the continental margin, and Hudson Bay
and Hudson Strait;
"certificate" means Mobile Offshore Drilling Unit Safety Certificate;
"certifying authority" means a testing laboratory or facility whose standards are recognised
and accepted by the Board;
"certified safe" means that equipment has been certified safe for use in a particular
hazardous atmosphere by a certifying authority;
"Chairman" means the Chairman of the Board of Steamship Inspection;
"Class I, Division l" is the CSA interpretation of Hazardous Zone 1 as defined in the IMO
Modu Code;
"Class I, Division 2" is the CSA interpretation of Hazardous Zone 2 as defined in the IMO
Modu Code;
"Coastal State" means the Government of the Country exercising administrative control
over the drilling operations of the unit;
"column stabilized unit" is a unit with the main deck connected to the underwater hull or
footings by columns or caissons;
"complement" means the number of persons the unit is certified to carry;
"control stations" means those stations from which main and emergency power, navigation,
electronic communications, firefighting and machinery for propulsion, steering,
positioning and essential ships services may be controlled or monitored;
"1974 SOLAS Convention" means the International Convention for the Safety of Life at
Sea, 1974;
"dead ship condition" means the condition under which the main propulsion plant, boilers
and auxiliaries are not in operation due to the absence of power;
"design pressure" means the maximum allowable working pressure to which the particular
item of machinery may be subjected;
"diving system" means the plant and equipment necessary for the safe conduct of diving
operations from a Mobile Offshore Drilling Unit;
- 4 -
"emergency source of electrical power" means a source of electrical power intended to
supply the emergency services in the event of failure of the main source of electrical
power;
"emergency switchboard" means a switchboard which in the event of failure of the main
source of electrical power is directly supplied by the emergency source of electrical
power or the transitional source of emergency power and intended to distribute
electrical energy to the emergency services;
"enclosed spaces" means spaces delineated by solid decks and bulkheads which may
have doors and/or windows;
"explosion proof" or flame proof means that an enclosure is capable of withstanding
without damage ad explosion of a specified gas or vapour which may occur and is
capable of preventing the ignition of a specified gas or vapour surrounding the
enclosure from sparks, flashes or explosion of the specified gas or vapour within the
enclosure;
"F.M. " means Factory Mutual Research Corporation;
"factory sealed" means an explosion proof device which is so constructed that external
seals are not required;
"freeboard" means the distance measured vertically downwards from the upper edge of
the deck line to the upper edge of the related load line;
"gas-tight door" means a solid close fitting door designed to resist the passage of gas
under normal atmospheric conditions;
"hazardous locations" means locations in which explosive accumulation of gases or
mixtures of flammable substances may be present;
"increased safety apparatus" means apparatus designed beyond standard industrial
norms to prevent, under normal working conditions, sparking or arcing and to avoid
rises in temperature to dangerous levels by any part in contact with an explosive mixture;
"industrial-machinery and components" the machinery and components which are not used
in connection with the marine operation;
"Inspector" means a Steamship Inspector appointed under the provisions of the Canada
Shipping Act;
- 5 -
"intrinsically safe apparatus" means apparatus that is so constructed that when installed
and operated under the conditions specified by the certifying authority, any electrical
sparking that may occur in normal and fault conditions either in the apparatus or in the
circuit associated therein, is incapable of causing an ignition of the prescribed
flammable gas or vapour;
"intrinsically safe circuit" means a circuit in which any electrical sparking that may occur in
normal and fault conditions specified by the certifying authority, and with the prescribed
components, is incapable of causing an ignition of the prescribed flammable gas or
vapour;
"length (L) " means 96 percent of the total length of a unit on its waterline at 85 percent of
the least moulded depth measured from the top of the keel, or the length from the
foreside of the stem to the axis of the rudder stock on the waterline, if that be greater; in
units designed with a rake of keel the waterline on which this length is measured shall be
parallel to the designed waterline;
"Letter of Compliance" means Mobile Offshore Drilling Unit Letter of Compliance;
"machinery" means boilers, main propulsion and ship service engines, unit positioning
systems, gearing, shafting, propellers, steering systems, windlasses, pumps,
compressors, pressure vessels, liquid, vapour and gas piping systems, control and
monitoring systems, electrical and electronic equipment and all similar apparatus
required for the operational safety of the ship and safety of life of personnel on board but
excluding industrial equipment;
"machinery spaces of Category A" means all spaces which contain internal combustion
type machinery and trunks to such spaces used either
(a) for main propulsion, or
(b) for other purposes where such machinery has in the aggregate a total power of
not less than 375 kilowatts or which contain any oil-fired boiler or oil fuel unit;
"machinery spaces" means all machinery spaces of Category A and all other spaces
containing propelling machinery, unit positioning systems, boilers and other fired
processes, oil fuel units, steam and internal combustion engines, generators and major
electrical machinery, oil filling stations, refrigerating, stabilizing, ventilation and air
conditioning machinery and similar spaces and trunks to such spaces;
"main source of electrical power" means a source intended to supply electrical power for
all services necessary for maintaining the unit in normal operational and habitable
conditions;
- 6 -
"main steering gear" means the machinery, the steering gear power units, if any, and
auxiliary equipment and the means of applying torque or thrust necessary for the
purpose of steering the unit under normal service conditions;
"main switchboard" means a switchboard directly supplied by the main source of electrical
power and intended to distribute electrical energy to the unit's services;
"maximum ahead service speed" means the greatest speed which the unit is designed to
maintain in service at sea at its deepest seagoing draft;
"maximum astern speed" is the speed which it is estimated the unit can attain at the
designed maximum astern power at its deepest seagoing draft;
"mobile offshore drilling unit" or "unit" means any vessel capable of engaging in drilling
operations for the exploration for or exploitation of resources beneath the sea-bed;
"mode of operation" means a condition or manner in which a unit may operate or function
while on location or in transit and include the following:
(a)"operating conditions" - conditions wherein a unit is on location for the purpose
of conducting drilling operations where the combined environmental and operational
loadings are within the appropriate design limits established for such operations,
(b)"severe storm conditions` conditions wherein a unit may be subjected to the
most severe environmental loadings for which the unit is designed; drilling operations are
assumed to have been discontinued due to the severity of the environmental loadings, and
(c)"transit conditions" conditions wherein a unit is moving from one geographical
location to another;
"moon pool" means that area of the hull through which drilling operations are conducted;
"non-combustible material" means a material as defined in the Hull Construction
Regulations;
- 7 -
"normal operational and habitable conditions" means
(a) conditions under which the unit as a whole, its machinery, services, means and
aids of ensuring safe navigation when underway, safety when in the industrial mode, fire
and flooding safety, internal and external communications and signals, means of escape
and winches for lifeboats and other lifesaving apparatus as well as the minimum
comfortable conditions of habitability are in working order and functioning normally, and
(b) conditions during drilling operations when the unit and all systems essential for
the safety of the unit and the safety of life of personnel on board are in working order and
functioning normally;
"operator" means an individual or company that seeks or has been granted approval
pursuant to the Canada Oil and Gas Drilling Regulations to conduct a drilling program;
"owner" means the registered owner of the unit as defined in the Canada Shipping Act;
"portable unit" means a transferable prefabricated structure which is not a permanent part
of the unit's structure;
"rescue boat" means an easily manoeuvred power boat capable of rapid launching and
adequate for quick recovery of a man overboard and towing a liferaft away from
immediate danger;
"self-elevating unit" means a unit with moveable legs capable of raising its hull above the
surface of the sea;
"semi-enclosed locations" means locations where natural conditions of ventilation are
notably different from those on open decks due to the presence of structures such as
roofs, wind breaks and bulkheads and which are so arranged that dispersion of gas
may not occur;
"service spaces" means those spaces used for galleys, pantries containing cooking
appliances, lockers and store-rooms, workshops other than those forming part of the
machinery spaces, and similar spaces and trunks to such spaces;
"stairtower" means an enclosure that provides continuous fire shelter for a stairway that
penetrates more than one deck;
"steel or other equivalent material" means steel or any material which, by itself or due to
insulation provided, has structural and fire integrity properties equivalent to steel;
"steering gear power unit" means, in the case of
- 8 -
(a) electric steering gear, an electric motor and its associated electrical equipment,
(b) electrohydraulic steering gear, an electric motor and its associated electrical
equipment and connected pump, and
(c) other hydraulic gear, a driving engine and connected pump;
"surface unit" is a unit with a ship or barge-type displacement hull of single or multiple hull
construction intended for operation in the floating condition;
"transitional source of emergency power" means a source of battery power intended to
supply the emergency services for the half hour period between the loss of main power
and the assumption of the emergency load by the emergency generator unless the
emergency generation is arranged for automatic start-up in not more than 45 seconds;
"UL" means Underwriters' Laboratories;
"watertight" means designed and constructed to withstand a static head of water without
any leakage;
"weathertight" means that water will.not penetrate into the unit in any sea condition;
"working spaces" means those open or enclosed spaces or portable units containing
equipment and processes Associated with drilling operations which are not included in
the definition of machinery spaces.
(2) The numerical units used in these Standards are as defined in the `Metric
Practice Guide` published by the Canadian Standards Association and unless specifically
stated, pressures prescribed are gauge pressures.
(3) Unless specifically defined in a particular Standard, all other words and
expressions used in these Standards have the same meaning as in the Canada Shipping
Act.
- 9 -
PART I
GENERAL
Application
3.(1) Subject to subsection (2) these Standards apply to
(a) Canadian registered units the keels of which are laid or which are at a similar
stage of construction,
(b) vessels which are converted to Canadian registered units,
(c) units which are transferred to Canadian Registry,
(d) foreign registered units operating within the territorial sea of Canada, and
(e) under the terms of the COGLA/CW Memorandum of Understanding foreign
registered units operating outside the territorial sea of Canada and on Canada Lands,
on or after the 31 January 1984.
(2) These Standards apply to existing units to the extent considered
reasonable and practical by the Board.
Responsibility
4.The owner and operator of every unit shall ensure that the unit complies with all the
applicable provisions of these Standards and applicable Regulations.
Equivalents
5.(1) Subject to subsection (2) where these Standards require that a particular fitting,
material, appliance, apparatus, item of equipment or type thereof shall be fitted or carried
on a unit, or that any particular provision shall be made, or any procedure or arrangement
shall be complied with, the Board may allow any other fitting, material, appliance,
apparatus, item of equipment or type thereof to be fitted or carried, or any other procedure
or arrangement to be made in the unit, if it is satisfied by trial thereof or otherwise that such
fitting, material, appliance, apparatus, item of equipment or type thereof or that any
particular provision, procedure or arrangement is at least as effective as that required by
these Standards.
- 10 -
(2) Approval of an equivalent arrangement may be revoked at any time
if it is found that the chosen arrangement is not satisfactory.
Submission of Plans and Data
6.(1) Every unit shall be constructed and equipped in accordance
with approved plans and data as described in section 7.
(2) The plans and data referred to in subsection (1) shall be submitted for
approval, in quadruplicate, in legible English or French language form prior to construction
or installation being commenced and if the construction or installation is commenced
before that approval is obtained the builder may be required to make such alterations as
are necessary to comply with the conditions of approval.
Plans and Data Required
7.(1) The following plans, descriptions and calculations, where applicable, are to be
submitted to the Board for approval:
(a) hull and equipment:
(i) general arrangement,
(ii) profile and decks,
(iii) transverse sections,
(iv) longitudinal sections,
(v) welding schedule giving details of steel grades,
(vi) loadings for all decks,
(vii) framing,
(viii) shell expansion,
(ix) subdivision plan,
(x) watertight bulkheads and flats,
(xi) structural bulkheads and flats,
- 11 -
(xii) tank bulkheads and flats with location of overflows,
(xiii) pillars and girders,
(xiv) diagonals and struts,
(xv) legs,
(xvi) structure in way of jacking and other elevating arrangements including
calculations confirming their adequacy,
(xvii) stability columns and intermediate columns,
(xviii) hulls, pontoons and fittings,
(xvix) superstructures and deck houses,
(xx) structural fire protection plan to include details of insulation, linings,
ceilings, deck coverings, doors, etc.,
(xxi) safety plan,
(xxii) escape plan,
(xxiii) arrangements and details of watertight, weathertight and gastight
doors, hatches and manholes,
(xxiv) general arrangement of hazardous locations,
(xxv) ventilation arrangement including details of fans, dampers, etc.,
(xxvi) rudder and steering systems,
(xxvii) anchoring, mooring and towing arrangements,
(xxviii) machinery and equipment foundations,
(xxix) seaboxes,
(xxx) air and sounding pipes,
(xxxi) rails and stanchions, ladders, elevators and inspection platforms,
- 12 -
(xxxii) operating manual - see section 111,
(xxxiii) information on the relevant limiting functional loads together with the
design environmental conditions,
(xxxiv) capacity plan, hydrostatic curves and cross curves of stability,
(xxxv) stability calculations for intact and damaged conditions,
(xxxvi) corrosion protection,
(xxxvii) details of non destructive testing programmes,
(xxxviii) details of quality control program,
(xxxix) details of pressure tests for hull structure,
(xl) details of heat treatment procedures for critical joints,
(xli) details of welding processes and procedures,
(xlii) lifesaving arrangements,
(xliii) details of lifting gear,
(xliv) details of helicopter deck, and
(xlv) details of navigating lights and other equipment as required by the
Collision Regulations;
(b) machinery:
(i) general arrangement of machinery and physical properties of
principal parts,
(ii) details of stern tube and stern bush or bearing,
(iii) details of thrust shafts, intermediate shafts, propeller shafts with the
propeller diameter indicated and shafts of electric generators, motors and
couplings essential for the safe operation of the unit,
- 13 -
(iv) diagrammatic arrangement of the feed water, steam, exhaust, cooling
water, fuel oil, lubricating oil and compressed air systems including vent,
sounding and overflow systems for fuel oil tanks with type and capacity of
pumps shown,
(v) diagrammatic arrangement and description of the bilge, ballast and
similar pumping systems, with type and capacity of pumps shown,
(vi) details of unfired pressure vessels including sprinkler and foam
pressure tanks, showing control and safety devices,
(vii) details of main, auxiliary and heating boilers, superheaters and
economizers; the heating surfaces, the maximum rating of water tube boilers
and the materials, size and pressure ratings of all boiler mountings,
(viii) details of engines and gearing for propulsion and services essential
to the safe operation of the unit, including power to services essential for safety
under emergency conditions,
(ix) details of main and auxiliary steering systems, giving particulars of
machinery, assigned torques, control systems, safety devices and physical
properties of finished parts,
(x) details of thruster units giving particulars of propellers, shafting,
gearing, control systems, safety devices and physical properties of finished
parts,
(xi) arrangements and details of jacking or other self-elevating systems,
(xii) details of fuel tanks separate from the hull,
(xiii) plans of fixed and portable fire detection and extinguishing equipment
as prescribed in the Fire Protection, Detection and Extinguishing Equipment
Regulations for a cargo ship,
(xiv) plans of liquified gas installations, and
(xv) general arrangement of controls and explanation of the operating
sequence of automated or remote controls for systems fitted for the operation of
the unit and for systems which may affect the safety of the unit or the safety of
life of personnel on board;
(c) electrical:
- 14 -
(i) load analysis,
(ii) short-circuit analysis,
(iii) elementary single line diagram of main and emergency distribution
systems,
(iv) elementary single line diagram of propulsion system,
(v) wiring diagram of propulsion control circuits,
(vi) details of switchboard including general arrangement, wiring diagram,
nameplates and materials,
(vii) wiring diagram of motor control centres,
(viii) lighting circuits wiring deck plan or book of diagrams including symbol
list,
(ix) essential interior communication systems - block diagrams,
(x) essential alarm system - block diagrams,
(xi) fire detection system - wiring deck plan and block diagram,
(xii) details of automated or remote control systems including description
of operation,
(xiii) plan of hazardous locations) including type and classification of all
electrical equipment located therein, and
(xiv) where an automatic start emergency diesel generator is fitted, a
wiring diagram and description of operation of the automatic start circuitry.
(2) Where alterations or additions are being carried out on an existing structure,
system or installation, plans and data covering all aspects of the modification shall be
submitted to the Board for approval.
- 15 -
Inspection
8.(1) Each unit shall be subject to the following inspections:
(a) a first inspection, as for a cargo ship, shall be carried out in accordance with the
applicable sections of the Hull Inspection Regulations, the Plachinery Inspection
Regulations, the Ship Safety Electrical Standards TP 127, and with the requirements of
these Standards;
(b) subject to paragraph(c) an annual general inspection, as for a cargo ship, shall
be carried out in accordance with the applicable sections of the Hull Inspection
Regulations, the Machinery Inspection Regulations, the Ship Safety Electrical Standards
TP 127 and with the following:
(i) the units permanent towing arrangement and anchoring system shall
be inspected, and
(ii) documents relating to the stability of the unit shall be examined, in
particular, the monitoring on board of the unit's lightweight and centre of gravity
shall be investigated; in addition at every Type III inspection a displacement
check shall be carried out to ascertain the lightweight of the unit and where a
significant difference in lightweight is found the Board may decide to reincline
the unit;
(c) an annual general inspection may be carried out within three (3) months on
either side of the due date;
(d) Subject to paragraphs (e) to (j) a periodic structural inspection shall be carried
out as follows:
(i) annual structural inspection - Type I a visual inspection of the primary
structural members and any high stress areas;
(ii) intermediate structural inspection - Type II a visual inspection with
partial non destructive testing of the primary structural members and any high
stress areas; and
(iii) special structural inspection - Type III a visual inspection with non
destructive testing of the primary structural members and any high stress areas
together with a visual inspection of the secondary structural members and
thickness gauging of any structure where wastage is evident or suspected;
- 16 -
(e) the following table indicates the sequence and periodicity of inspections
required:
TYPE OF
INSPECTION
PERIODICITY IN
YEARS
I 1
III 2
1/2
III 4
(f) Type I inspections may be carried out on location provided all exposed
structures can be examined; Type II and Type III inspections shall be carried out in
sheltered waters except that Type II inspections may be carried out on location provided a
Steamship Inspector is satisfied with the inspection arrangements and procedures;
(g) a Type I inspection may be carried out within three (3) months on either side of
the due date;
(h) a Type II inspection may be carried out within six (6) months on either side of
the due date but the maximum period between Type II and Type III inspections shall not
exceed thirty-six (36) months;
(j) a Type III inspection may be postponed for a period of twelve (12) months
subject to the completion of a Type I inspection and provided that the maximum period
between Type III inspections does not exceed five (5) years;
(k) a drydock inspection or equivalent shall be conducted during Type II and Type III
structural inspections in accordance with the applicable sections of the Hull Inspection
Regulations and the Machinery Inspection Regulations;
(l) an inspection either partial or general according to the circumstances shall be
carried out every time a defect is discovered or an accident occurs which affects the safety
of the unit or whenever any significant repairs, alterations or additions are made; and
(m) when considered necessary by the Board a post-voyage inspection shall be
carried out after an ocean voyage, wet tow or dry tow that exceeds ten (10) days duration
to ascertain that the structure has suffered no damage in transit and remains in a safe
condition.
(2) A program for conducting structural Type inspections shall be submitted for
approval and in addition the owner may submit a proposal to the Board for a system
of continuous inspection of the hull and' machinery whereby all items are inspected
and tested in regular, rotation within a five year-period.
- 17 -
(3) In the case of units which have been out of service for an extended period the
requirements for inspections on reactivation will be considered in each case with
due regard being given to the-status of inspections at the time of the
commencement of the lay-up period, the length of the period and conditions under
which the unit had been maintained during that period.
Fees
9.Inspection fees shall be paid in accordance with the Board of Steamship Inspection
Scale of Fees.
Certification
10.(1) A Certificate may be issued to a Canadian registered unit for a period of five
years subject to annual endorsement only after completion of a satisfactory first inspection
or appropriate inspection in accordance with section 8 of this Part.
(2) A Certificate may be endorsed only after completion of the appropriate
satisfactory inspection in accordance with section 8 of this Part.
(3) A Letter of Compliance may be issued for a period of one year to a foreign
registered unit prior to commencing operations in Canada Lands and only after completion
of an assessment for compliance with these standards.
11.(1) A Certificate shall cease to be valid
(a) on the date of expiry stated thereon;
(b) if the Certificate has not been endorsed in accordance with subsection 10(2);
(c) if any significant alterations have been-made, without being approved in the
structure, equipment, fittings, arrangements, or material required by these Standards,
except the direct replacement of equipment or fittings for the purpose of repair or
replacement; or
(d) if the unit is transferred from Canadian Registry.
(2) A Letter of Compliance shall cease to be valid
(a) on the date of expiry stated thereon; or
- 18 -
(b) if any significant alterations have been made, without being approved in the
structure, equipment, fittings, arrangements, or material required by these Standards,
except the direct replacement of equipment or fittings for the purpose of repair or
replacement.
- 19 -
PART II
CONSTRUCTION, STRENGTH AND MATERIALS
General
12.(1) The structural strength of every unit to which these Standards apply shall be
sufficient for the service and area of operation for which the unit is intended.
(2) The Board may accept as standards of construction the standards set out in
the current edition of the construction rules published by Lloyds Register of Shipping,
American Bureau of Shipping, Bureau Veritas or Det Norske Veritas.
(3) Where the Board has accepted the standards of one of the rules described
in subsection (2) in relation to a unit, any deviation from such rules shall be submitted to the
Board for approval.
Design Loads
13.(1) The modes of operation for each unit shall be investigated using realistic
loading conditions with relevant environmental loadings; the following environmental
considerations shall be included, where applicable:
(a) wind forces, sustained and gust wind velocities as relevant shall be considered
when determining wind loadings; pressures and resultant forces shall be calculated by the
method referred to in section 23 or by an equivalent method;
(b) wave forces, the design wave criteria shall be described by design wave
energy spectra or determinate design waves having appropriate shape and size;
consideration shall be given to waves of lesser height, where due to their period, the
effects on structural elements may be greater;
(c) wave forces utilized in the design analysis shall include the effects of
immersion, heeling and acceleration due to motion; theories used for the calculation of
wave forces and the selection of coefficients shall be to the satisfaction of the Board;
(d) current loadings, consideration shall be given to the interaction of current and
waves and where necessary, this superimposition shall be performed by adding the current
velocity vectorially to the wave particle velocity with the resultant velocity being used in
calculating the structural loadings due to current and waves;
- 20 -
(e) ice and snow forces;
(f) mooring forces;
(g) temperature;
(h) extraordinary conditions such as the occurrence of earthquakes, fouling, etc.
and
(j) any other loadings considered relevant by the Board.
(2) When available the above design environmental conditions shall be
based upon relevant data with a period of recurrence of at least 100 years for the most
severe anticipated environment.
(3) Results from relevant model tests may be used instead of calculations or to
substantiate or amplify calculations.
Structural Analysis
14.(1) Loading conditions for all modes of operation shall be analysed to enable the
critical design cases for all principal structural components to be evaluated; this design
analysis shall be to the satisfaction of the Board.
(2) The scantlings shall be determined on the basis of criteria which combine the
individual stress components in each structural element and the allowable stresses shall be
to the satisfaction of the Board.
(3) Local stresses, including stresses caused by circumferential loadings on
tubular members, shall be added to primary stresses in evaluating combined stress levels.
(4) The buckling strength of structural members shall be evaluated
where appropriate by the Board.
(5) Where deemed necessary by the Board, a fatigue analysis based on the
most severe intended operating areas or environments shall be provided.
(6) The effect of notches, local stress concentrations and other stress raisers
shall be accounted for in the design of primary structural elements.
- 21 -
(7) Structural joints shall not be designed to transmit primary tensile stresses
through the thickness of plates integral with the joint; where such joints are unavoidable, the
plate material properties and inspection procedures selected to prevent lamellar tearing
shall be to the satisfaction of the Board.
Special Consideration for Surface Units
15.(1) The required strength of the unit shall he maintained in way of the moon pool,
and particular attention shall be given to the transition of fore and aft members, the plating
of the well shall also be suitably stiffened to prevent damage during transit modes of
operation.
(2) Consideration shall be given to the scantlings in way of large hatches to
maintain strength of the main hull girder.
(3) Local structure in way of fairleads, winches, etc. forming part of the position
mooring system, shall be capable of withstanding forces equivalent to the breaking test
load of a mooring chain.
Special Consideration for Self-elevating Units
16.(1) The hull strength shall be evaluated in the elevated position for the specified
environmental conditions with maximum gravity loads aboard and supported by all legs; the
distribution of these loads in the hull structure shall be determined by a method of rational
analysis and scantlings shall be calculated based on this analysis, but shall not be less than
those required for other modes of operation.
(2) The unit shall be designed to enable the hull to clear the highest design wave
including the combined effects of astronomical and storm tides; the minimum clearance
may be the lesser of either 1.2 metres or 10 per cent of the combined storm tide,
astronomical tide and height of the design wave above the mean low water level.
(3) Legs shall be designed to withstand the dynamic loads which may be
encountered by their unsupported length while being lowered to the bottom and also to
withstand the shock of bottom contact due to wave action on the hull; the maximum design
motions, sea state and bottom conditions for operations to raise or lower the hull shall be
clearly stated in the Operating Manual.
(4) When evaluating leg stresses with the unit in the elevated position, the
maximum overturning moment on the unit due to the most adverse combination of
applicable environmental and gravity loadings shall be considered.
- 22 -
(5) Legs shall be designed for the most severe environmental transit conditions
anticipated including wind moments, gravity moments and accelerations resulting from unit
motions; the Board shall be provided with calculations, an analysis based on model tests,
or a combination of both; acceptable transit conditions shall be included in the Operating
Manual.
(6) Structural members which transmit loads between the legs and the hull shall
be designed for the maximum loads transmitted and arranged to diffuse the loads into the
hull structure.
(7) When a mat is utilized to transmit the bottom bearing loads, attention shall be
given to the attachment of the legs so that the loads are diffused into the mat.
(8) Where tanks in the mat are not open to the sea, the scantlings shall be based
on a design head using the maximum water depth and tidal effects.
(9) Mats shall be designed to withstand the loads encountered during lowering
including the shock of bottom contact due to wave action on the hull.
(10) The effect of possible loss of bottom support shall be considered and the
effect of skirt plates, where provided, shall be given special consideration.
(11) Except for those units utilizing a bottori mat, the capability shall be provided
to pre-load each leg to the maximum applicable combined load after initial positioning at a
site and the pre- loading procedures shall be included in the Operating Manual.
(12) Deckhouses located near the side shell of a unit may be required to have
scantlings similar to those of an unprotected house front and other deckhouses shall have
scantlings suitable for their size, function and location.
- 23 -
Special Consideration for Column Stabilized Units
17.(1) Unless deck structures are designed for wave impact
(a) the unit shall be designed in such a manner that passing wave crests will not
touch the underside of the lower deck structure during any predicted wave conditions with
the unit at survival draft; and
(b) the Board shall be provided with model test data, past operating experience
with similar configurations or calculations showing that adequate provision is made to
maintain this clearance.
(2) The scantlings of the upper structure shall not be less than those required for
the loadings shown in the deck loading plan, and if an approved mode of operation or
damaged condition in accordance with the stability requirements allows the upper structure
to become waterborne, special consideration shall be given to the resulting structural
loadings.
(3) The scantlings of columns, lower hulls and footings should be based on the
evaluation of hydrostatic pressure loadings and combined loadings including wave and
current considerations.
(4) Where a column, lower hull or footing is a part of the overall structural frame
of a unit, consideration shall also be given to stresses resulting from deflections due to the
applicable combined loadings.
(5) Particular consideration shall be given to structural arrangements and details
in areas subject to high local loadings resulting from, for example, external damage, wave
impact or partially filled tanks.
(6) The structure in way of components for the position mooring system such as
fairleads and winches shall be designed to withstand the stresses imposed when a
mooring chain is loaded to its breaking test load.
(7) Bracing members shall be designed to make the structure effective against
applicable combined loadings and such members shall also be investigated, where
applicable, for combined stresses including local bending stresses due to buoyancy, wave
forces and current forces and the following:
(a) where applicable, consideration shall be given to local stresses caused by
wave impact;
- 24 -
(b) where bracings are watertight they shall be designed to prevent collapse from
hydrostatic pressure and be fitted with an effective leak detection system; and
(c) consideration shall be given to the need for ring frames to maintain stiffness
and shape in tubular bracing members.
Construction Portfolio
18.A construction portfolio including plans showing the location and extent of
application of different grades and strengths of materials, together with a description of the
materials and welding procedures employed, and any other relevant construction
information shall be prepared and a copy placed on board the unit; restrictions or
prohibitions regarding repairs or modifications shall be included in the portfolio.
Materials and Welding
19.(1) Units shall be constructed from steel or other suitable material having properties
acceptable to the Board.
(2) The welding procedures employed during construction shall be to the
satisfaction of the Board; the selection of welds for testing and the methods utilized shall be
to the satisfaction of a Steamship Inspector.
(3) Welding shall be carried out by operators certificated to the appropriate level
by a Provincial Government of Canada or other authority approved by the Board.
- 25 -
PART III
INTACT AND DAMAGE STABILITY AND FREEBOARD
Inclining Experiment
20.An inclining experiment shall be conducted on each unit in the presence of and to
the satisfaction of a Steamship Inspector and the results of the experiment shall be
submitted to the Board for approval.
Sample Loading Conditions
21.(1) The following typical operating conditions shall be developed from the results of
the inclining experiment and submitted to the Board for approval:
(a) normal operating condition at maximum draught with the maximum deck load
and equipment in the most unfavourable positions;
(b) severe storm conditions at survival draught assuming the same weight
distribution as in the normal operating condition except for the necessary ballast
adjustments and possible dumping of the variable deck load and with the marine riser
assumed disconnected and a reasonable amount of drill pipe assumed stored in the pipe
rack;
(c) normal transit departure condition with related maximum deck load;
(d) normal transit arrival condition with related maximum deck load; and
(e) severe storm conditions at survival draught assuming the same weight
distribution as in the normal transit conditions except for the necessary ballast adjustments
and possible dumping of the variable deck load.
(2) The KG values of the conditions defined in subsection (1) corrected for free
surfaces shall not exceed the values given by the respective allowable KG curves required
by section 22.
(3) When calculating the displacement and KG account shall be taken of the
weight of mooring lines in use with the vertical component of the mooring forces being
included; reasonably accurate data as a function of the water depth shall be available in the
Operating Manual.
- 26 -
(4) For operations in those areas where icing up can occur the variable deck
load in each condition shall be adjusted to allow for the effect of ice and snow accumulation
on the unit's structure.
Allowable KG Curves
22.(1) The following allowable vertical centre of gravity curves ensuring compliance
with both the intact stability criteria of section 24 and the damage stability criteria of section
25 with supporting calculations are to be prepared for the complete range of draughts and
submitted to the Board for approval:
(a) normal operating and transit conditions - maximum KG values according to the
intact stability criteria with 70 knot wind and damage stability criteria with 50 knot wind;
(b) temporary conditions, column stabilized units when changing draught -
maximum KG values according to the intact stability criteria with 70 knot wind; and
(c) severe storm conditions - maximum KG values according to the intact stability
criteria with 100 knot wind.
(2) In cases where a change in draught is necessary to reach the
survival draught a ballasting curve shall be included.
(3) The allowable KG curves shall reflect the lowest KG values obtained for the
most critical axis; the unit shall be free to trim when heeled.
Righting Moment and Wind Heeling Moment Curves
23.(1) Curves of righting moments and of wind heeling moments similar to Figure 1
with supporting calculations for the chosen drafts and maximum KGs used for calculating
the allowable KG curves shall be prepared and submitted to the Board for approval; the
righting moment curves and wind heeling moment curves shall be related to the most
critical axes; the influence of the mooring forces on the righting moment shall be
disregarded.
(2) Where equipment is of such a nature that it can be lowered and stowed,
additional wind heeling moment curves may be required and such data shall clearly
indicate the position of such equipment.
(3) The curves of wind heeling moments shall be drawn for wind forces
calculated by the following formula:
- 27 -
F =1/2C
s
CHP
V2
A
(newtons)
where
F = the wind force (newtons)
C
S
= the shape coefficient depending on the shape of the
structural member exposed to the wind (see table 1)
C
H
= the height coefficient depending on the height above sea
level of the structural member exposed to wind (see table 2)
P = the air mass density (1.222 kilograms per cubic metre)
V = the wind velocity (metres per second)
A = the projected area of the exposed surface of the structural
member in either the upright or the heeled condition (square
metres)
(A + B) 1.4(B + C) For surface and Self-elevating Units
(A + B) 1.3(B + C) For Column Stabilized Units
Note:Downflooding angle is the angle at which water can enter the
hull, superstructures or deck houses through openings which are not capable
of being made weathertight.
FIGURE I
RIGHTING MOMENT AND WIND HEELING MOMENT CURVES
- 28 -
TABLE 1.VALUES OF THE COEFFICIENT C
S
SHAPE C
S
Sperical 0.4
Cylindrical 0.5
Large, flat surface (hull, deckhouse, smooth under deck areas) 1.0
Drilling derrick 1.25
Wires 1.2
Exposed beams and girders under deck 1.3
Small parts 1.4
Isolated shapes (crane, beam, etc.) 1.5
Clustered deck houses or similar structures 1.1
TABLE 2.VALUES OF THE COEFFICIENT C
H
HEIGHT ABOVE SEA LEVEL (METRES) C
H
0 - 15.3 1.00
15.3 - 30.5 1.10
30.5 - 46.0 1.20
46.0 - 61.0 1.30
61.0 - 76.0 1.37
76.0 - 91.5 1.43
91.5 - 106.5 1.48
106.5 - 122.0 1.52
122.0 - 137.0 1.56
137.0 - 152.5 1.60
152.5 - 167.5 1.63
167.5 - 183.0 1.67
183.0 - 198.0 1.70
198.0 - 213.5 1.72
213.5 - 228.5 1.75
228.5 - 244.0 1.77
244.0 - 256.0 1.79
above 256 1.80
- 29 -
(4) Wind forces shall be considered from any direction relative to the unit and the
value of the wind velocity shall be as follows:
(a) in general a minimum wind velocity of 36 metres per second (70 knots) for
offshore service shall be used for normal operating conditions and a minimum wind velocity
of 51.5 metres per second (100 knots) shall be used for the severe storm conditions;
(b) where a unit is to be limited in operation to sheltered locations (protected inland
waters such as lakes, bays, swamps, rivers, etc.) consideration shall be given to a reduced
wind velocity of not less than 25.8 metres per second (50 knots) for normal operating
conditions; and
(c) for the damaged condition a wind velocity of 25.8 metres per second (50 knots)
shall be used.
(5) In all cases for the purpose of calculation, it shall be assumed that the unit is
floating free of mooring restraints.
(6) in calculating the projected areas to the vertical plane the area of surfaces
exposed to wind due to heel or trim such as under decks, etc., shall be included using the
appropriate shape factor; open truss work may be approximated by taking 30 per cent of
the projected block area of both the front and back section, i.e., 60 per cent of the
projected block area of one side.
(7) In calculating the wind heeling moments the lever of the wind overturning force
shall be taken vertically from the centre of pressure of all surfaces exposed to the wind to
the centre of lateral resistance of the underwater body of the unit with the unit assumed
floating free of mooring restraint.
(8) The wind heeling moment curve shall be calculated for a sufficient number of
heel angles to define the curve; for ship shaped hulls the curve may be assumed to vary as
the cosine function of the units heel.
(9) Wind heeling moments derived from wind tunnel tests on a representative
model of the unit may be considered as alternatives to the method given in this section;
such heeling moment determination shall include lift and drag effects at various applicable
heel angles.
- 30 -
Intact Stability Criteria
24.(1) The intact stability of a unit in each mode of operation shall meet the following
criteria (see also Figure l):
(a) all units shall have a static heel when the unit is subjected to the wind heeling
moments of section 23 of not more than 15 degrees in any condition;
(b) surface units and self-elevating units shall have
(i) a metacentric height of at least 0.50 metres, and
(ii) an area under the righting moment curve at or before the second
intercept or the angle of downflooding, whichever is less, of not less than 40 per
cent in excess of the area under the wind heeling moment curve to the same
limiting angle; and
(c) column Stabilized Units shall have
(i) a metacentric height of at least 1.0 metre in all operating and transit
conditions and a metacentric height not less than 0.3 metres in all temporary
conditions, and
(ii) an area under the righting moment curve at or before the second
intercept or the angle of downflooding, whichever is less, of not less than 30 per
cent in excess of the area under the wind heeling moment curve to the same
limiting angle.
(2) Each unit shall be capable of attaining a severe storm condition in a period
of time consistent with the meteorological conditions, the procedures recommended and
the approximate length of time required considering both operating conditions and transit
conditions shall be contained in the Operating Manual.
(3) The Board will consider other standards of stability where it can be shown
that they are equivalent to the above criteria.
(4) Alternative methods of proving that stability criteria are fulfilled, such as the
application of wind tunnel tests and behaviour tests of a representative model in waves
may be considered by the Board provided an equivalent level of safety is maintained.
- 31 -
Damage Stability
25.(1) Calculations shall be submitted to the Board to indicate that each unit shall be
capable of withstanding the damage defined in section 27 in the normal operating and
normal transit conditions and remaining afloat in the following state of equilibrium:
(a) the waterline in the final condition of equilibrium after flooding, taking into
account the effect of wind according to section 22 shall be below the lower edge of any
opening through which progressive flooding may take place;
(b) the final angle of heel shall not exceed 15 degrees in any direction;
(c) the area under the righting moment curve shall be at least equal to the area
under the heeling moment curve; both areas are to be calculated from the static angle of
heel without wind up to the second intercept, or any lesser angle; and
(d) bilge and ballast systems, lifesaving equipment, means of escape and lighting
shall be capable of operating in the above equilibrium condition.
(2) The ability to reduce heeling angles by pumping out or ballasting
arrangements or application of mooring forces, etc, shall be not be considered as
alleviating the requirements.
Permeability Factors
26.The permeability factors to be applied in the damage stability calculations are
Store rooms 0.60 Accommodation Spaces 0.95
Machinery spaces 0.85 Voids 0.95
Tanks for consumables 0.95
The permeability of ballast tanks is to be consistent with the amount of ballast carried.
Extent of Damage
27.(1) Surface units:
(a) in assessing the damage stability of surface units, the following extent of
damage shall be assumed to occur between effective watertight bulkheads:
(i) longitudinal extent: 3 metres;
- 32 -
(ii) vertical extent: from the baseline upwards without limit; and
(iii) horizontal penetration: 1.5 metres;
(b) where damage of a lesser extent than in this subsection results
in a more severe condition, such lesser extent shall be assumed; and
(c) all piping, ventilation systems, trunks, etc, within the extent of damage referred
to in this subsection shall be assumed to be damaged; positive means of closure shall be
provided at watertight boundaries to preclude the progressive flooding of other spaces
which are intended to be intact and the means of closure shall be readily accessible at all
times.
(2) Self-elevating units:
(a) In assessing the damage stability of self-elevating units, the following extent of
damage shall be assumed to occur between effective watertight bulkheads:
(i) horizontal extent: 3 metres;
(ii) vertical extent: from the base line upwards without limit; and
(iii) horizontal penetration: 1.5 metres;
(b) where damage of a lesser extent than in this subsection results in a more
severe condition, such lesser extent shall be assumed;
(c) where a mat is fitted the above extent of damage shall be applied to both the
platform and the mat but not simultaneously, unless deemed necessary by the Board due to
their close proximity to each other; and
(d) all piping, ventilation systems, trunks, etc. within the extent of damage referred
to in this subsection shall be assumed to be damaged and positive means of closure shall
be provided at watertight boundaries to preclude the progressive flooding of other spaces
which are intended to be intact and the means of closure shall be readily accessible at all
times.
(3) Column Stabilized Units:
(a) in assessing the damage stability of column stabilized units, the following extent
of damage shall be assumed:
- 33 -
(i) only those columns on the periphery of the unit shall be assumed to be
damaged and the damage shall be assumed in the exposed portions of the
column;
(ii) columns which are subdivided into watertight compartments by
watertight flats shall in general be assumed to be damaged within any one
compartment enclosed by watertight flats and where a watertight flat is located
within 1.5 metres above or below the draft under consideration, the damage
shall be assumed to have occurred in both compartments above and below the
watertight flat in question;
(iii) horizontal penetration: 1.5 metres;
(iv) horizontal extent: 3.0 metres, measured along the periphery of the
column or pontoon; and
(v) lower hulls or footings shall be assumed damaged when operating in
a light or transit condition in the same manner as indicated in this paragraph or
in subsection 27(1) having regard to their shape;
(b) where damage of a lesser extent than in this subsection results in a more
severe condition, such lesser extent shall be assumed;
(c) al! piping, ventilation systems, trunks, etc. within the extent of damage referred
to in this subsection shall be assumed to be damaged; positive means of closure shall be
provided at watertight boundaries to preclude the progressive flooding of other spaces
which are intended to be intact and the means of closure shall be readily accessible at all
times; and
(d) special consideration may be given to units fitted with efficient rendering
arrangements.
Watertight Integrity
28.(1) All units shall be provided with watertight bulkheads as may be required to give
adequate strength and subdivision.
(2) The number of openings in watertight subdivisions shall be kept to a
minimum compatible with the design and proper working of the unit and where
penetrations of watertight decks and bulkheads are necessary for access, piping,
ventilation, electrical cables, etc., arrangements shall be made to maintain the watertight
integrity of the enclosed compartments.
- 34 -
(3) Where valves are provided at watertight boundaries to maintain watertight
integrity, these valves shall be capable of being operated from a deck which is above the
final waterline after flooding and valve position indicators shall be provided at the remote
control station.
(4) For self-elevating units the ventilation system valves required to maintain
watertight integrity shall be kept closed when the unit is afloat and necessary ventilation in
this case shall be arranged by alternative approved methods.
Internal Openings
29.(1) The means to ensure the watertight integrity of internal openings which are used
during the operation of the unit, while afloat, shall comply with the following:
(a) subject to paragraph (b) doors shall be remotely controlled from a continuously
manned central position on a deck which is above the final waterline after flooding and
shall also be operable locally from each side of the bulkhead and indicators shall be
provided at the control position to indicate whether the doors are open or closed; and
(b) the requirements regarding remote controls may be dispensed with for those
doors or hatch covers which are normally closed while the unit is afloat, provided an alarm
system is arranged showing personnel at a continuously manned central position whether
the doors in question are open or closed and a notice being affixed to each such door or
hatch cover to the ef fect that it is not to be left open while the unit is afloat.
(2) To ensure the watertight integrity of internal openings which are kept
permanently closed during the operation of the unit, while afloat a permanent notice shall
be affixed to each such closing appliance, in a prominent position, to the effect that it is to
be kept closed while the unit is afloat, except that manholes fitted with close bolted covers
need not be so marked; on self elevating units an entry shall be made in the official log
book to the effect that all such openings have been witnessed closed before the unit
becomes waterborne.
External Openings
30.(1) Where watertight integrity is dependent on external openings which are used
during the operation of the unit, while afloat, they shall comply with the following:
(a) the lower edges of openings, including air pipes regardless of closing
appliances, shall not be submerged;
- 35 -
(b) openings such as manholes fitted with close bolted covers and side suttles of
the non-opening type may be submerged; and
(c) small hatches which are normally used for access by personnel may be
submerged provided they are not considered as emergency exits and are fitted with
(i) approved quick acting watertight covers of steel, or equivalent
material,
(ii) an alarm system indicating to personnnel at a continuously manned
central position whether the hatch covers in question are open or closed, and
(iii) a permanent notice in a prominent position to the effect that the hatch
is to be kept closed except during use while the unit is afloat.
(2) The requirements of subsection 29(2) shall apply where the watertight
integrity is dependent on external openings which are permanently closed during the
operation of the unit while afloat.
FREEBOARD
General
31.(1) The requirements, including those relating to certification, of the applicable
Load Line Rules shall apply to all units and certificates shall be issued as appropriate.
(2) The minimum freeboard of units which cannot be computed by the normal
methods laid down by those Rules shall be determined on the basis of meeting the
applicable intact stability, damage stability and structural requirements for transit
conditions and drilling operations while afloat; however, the freeboard shall not be less than
that computed from the applicable Load Line Rules.
(3) Subject to sections 32, 33 and 34 the requirements of the applicable Load
Line Rules with respect to weathertightness and watertightness of decks, superstructures,
deckhouses, doors, hatchway covers, other openings, ventilators, air pipes, scuppers,
inlets and discharges, etc. shall be taken as a basis for all units in the afloat conditions.
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Surface Units
32.(1) Load Lines shall be assigned to surface units as calculated under the terms of
the applicable Load Line Rules and shall be subject to all the conditions of assignment of
those Rules.
(2) Where it is necessary to assign a greater than minimum freeboard to meet
intact or damage stability requirements or for any other restriction imposed by the Board,
Regulation 6(6) of Part I, Schedule I and Regulation 27(10) of Part III of the Load Line
Regulations (Sea) and Load Line Regulations (Inland), respectively, shall apply and when
such a freeboard is assigned, seasonal marks above the centre of the ring shall not be
marked and any seasonal marks below the centre of the ring shall be marked.
(3) If a unit is assigned a greater than minimum freeboard at the request of the
owner, Regulation 6(6) and Regulation 27(10) of the applicable Load Line Regulations
need not apply.
(4) Where wells such as moonpools are arranged within the hull, the volume of
the well shall be deducted from the volume of displacement of the unit used for the
calculation of the block coefficient and an addition shall be made to the freeboard, equal to
the volume of the well divided by the waterplane area to compensate for the loss of
buoyancy.
(5) The procedure described in subsection (4) shall also apply in cases of small
notches or relatively narrow cut-outs at the stern of the unit.
(6) Narrow wing extensions at the stern of the unit shall be considered as
appendages and excluded for the determination of length (L) and for the calculation of
freeboards and the Board shall determine the effect of such wing extensions with regard to
the requirements for the strength of unit based upon length (L).
Self-elevating Units
33.(1) Load Lines shall be assigned to self-elevating units as calculated under the
terms of the applicable Load Line Rules; when floating or when in transit from one
operational area to another units shall be subject to all the conditions of assignment unless
specifically excepted; these units shall not be subject to the requirements of the Load Line
Rules while they are supported by the sea-bed or are in the process of lowering or raising
their legs.
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(2) The minimum freeboard of units which due to their configuration cannot be
computed by the normal methods laid down by the applicable Load Line Rules shall be
determined on the basis of meeting applicable intact stability, damage stability and
structural requirements in the afloat conditions.
(3) Where it is necessary to assign a greater than minimum freeboard
to meet intact or damage stability requirements or for any other restriction imposed by the
Board, Regulation 6(6) of Part I, Schedule I and Regulations 27(10) of Part III of the Load
Line Regulations (Sea) and Load Line Regulations (Inland), respectively, shall apply and
when such a freeboard is assigned, seasonal marks above the centre of the ring shall not
be marked and any seasonal marks below the centre of the ring shall be marked.
(4) If a unit is assigned a greater than minimum freeboard at the request of the
owner Regulation 6(6) and Regulation 27(10) of the applicable Load Line Regulations
need not apply.
(5) Where wells such as moonpools are arranged within the hull, the volume of
the well shall be deducted from the volume of displacement of the unit used for the
calculation of the block coefficient and an addition shall be made to the freeboard, equal to
the volume of the well divided by the waterplane area to compensate for the loss of
buoyancy.
(6) The procedure described in Subsection (5) shall apply in cases of small
notches or relatively narrow cut-outs at the stern of the unit.
(7) Narrow wing extensions at the stern of the unit shall be considered as
appendages and excluded for the determination of length (L) and for the calculation of
freeboards and the Board shall determine the effect of such wing extensions with regard to
the requirements for the strength of unit based upon length (L).
(8) Self-elevating units may be manned when under tow; in such cases a unit will
be subject to a bow height requirement which may not always be possible to achieve; in
such circumstances, the Board shall consider the extent of application of Regulation 39(3)
of the Load Line Regulations (Sea) to such units, having regard to the occasional nature of
such voyages on predetermined routes and to prevailing weather conditions.
(9) Some self-elevating units utilize a large mat or similar supporting structure
which contributes to the buoyancy when the unit is floating; in such cases the mat or similar
supporting structure shall be ignored in the calculation of freeboard but shall always be
taken into account in the evaluation of the stability of the unit when floating since its vertical
position relative to the upper hull may be critical.
Column Stabilized Units
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34.(1) The hull form of this type of unit makes the calculation of geometric freeboard in
accordance with the provisions of the applicable Load Line Regulations impracticable and
therefore the minimum freeboard of each column stabilized unit shall be determined by
meeting the applicable requirements for
(a) the strength of the unit's structure,
(b) the minimum clearance between passing wave crests and deck structure as
required by section 17(1), and
(c) intact and damage stability requirements.
(2) The minimum freeboard shall be marked at appropriate locations on the
structure and where practicable, such marks shall be visible to the person in charge of
mooring, lowering or otherwise operating the unit.
(3) The main deck of each column stabilized unit shall be made weathertight as
far as practicable.
(4) In general, heights of hatch and ventilator coamings, air pipes, door sills, etc.
in exposed positions and their means of closure shall be determined by consideration of
both intact and damage stability requirements, in particular, all openings which may
become submerged before the heeling angle at which the required area under the intact
righting arm curve is achieved shall be fitted with weathertight closing appliances.
(5) Weathertight closing appliances shall also be fitted to openings which lead to
spaces the volume of which was included in the calculation of cross curves of stability and
to sanitary discharges originating in such spaces and which lead through the shell; and with
regard to damage stability, the requirements in subsection 30(1) shall apply.
(6) The Board shall give special consideration to the position of openings which
cannot be closed in emergencies, such as air intakes for emergency generators, having
regard to the intact righting arm curves and the final waterline after assumed damage.
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PART IV
MACHINERY INSTALLATIONS FOR ALL TYPES OF UNITS
General
35.(1) This section applies to Parts IV to VIII and subject to subsection (2) before a
certificate is issued to a new unit the Inspector shall carry out a first inspection of the
machinery and verify that
(a) the machinery has been designed, constructed and installed in accordance with
the approved plans and with these Standards;
(b) the assigned working pressures of the boilers and pressure vessels are in
accordance with approved plans and that connected systems are protected against
overpressure;
(c) where applicable, the propelling, steering and positioning machinery is
sufficient in power and capacity to enable the unit to be manoeuvered both ahead and
astern and controlled at sea with a proper degree of safety having regard to the voyages
the unit is to make;
(d) means are provided to protect against overspeeding and excessive vibration of
machinery;
(e) the safety devices fitted to the machinery are in correct adjustment and
operable condition;
(f) efficient guards are fitted in the way of moving machinery or hazardous
equipment to provide protection against accident;
(g) sufficient means are provided to clean, maintain and inspect machinery parts;
(h) means are provided to ensure that the machinery can be brought into operation
from the dead ship condition without external aid;
(j) units are provided with two means of communicating orders from the bridge or
main control room to the main machinery control station;
(k) the supervision, monitoring and control of the machinery is in accordance with
these Standards; and
(1) suitable slip resisting gratings, handrails and ladders are fitted to allow
access to machinery for operational and maintenance purposes.
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(2) Design, construction, installation and inspection requirements in addition to
those detailed in this Part shall be in accordance with the requirements of the Machinery
Inspection Regulations, the Machinery Construction Regulations, Marine Automation
Standards TP2069 and Ship Safety Electrical Standards TP-127.
(3) Subject to subsection (4) main machinery and auxiliary machinery essential
for the operation and safety of the unit shall be designed to function at full rated power when
it is upright and when inclined at any angle of list up to and including
(a) 15 degrees either way under static conditions and 22
1/2
degrees under dynamic
conditions (rolling) either way and simultaneously inclined dynamically (pitching) 7