15200-1 SECTION 15200 - VIBRATION ISOLATION PART 1 - GENERAL

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15200
-
1




SECTION 15200
-

VIBRATION ISOLATION



PART 1
-

GENERAL


1.1

RELATED DOCUMENTS
:

A.

Drawings and general provisions of Contract, including General and Supplementary C
onditions
and Division 1 Specification Sections, apply to this Section.


1.2

WORK INCLUDED
:

A.

This Section of the Specification includes the vibration isolation of various machinery,
equipment, piping, ductwork and conduit fu
rnished in the Division 15 and Division 16 Sections.


1.3

QUALITY ASSURANCE
:

A.

Static deflection of vibration isolators shall conform to the Schedules as a minimum, and shall be
no less than recommended in the ASHRAE Guid
e and Data Book for the actual floor spans
involved. Replace at no charge any isolator failing to conform to these Specifications as applied
to the actual systems involved.

B.

A single vibration isolation manufacturer, or his qualified representative, sh
all supply vibration
isolation devices, including auxiliary steel bases and pouring forms, and be responsible for
coordination of this Work.

C.

The vibration isolation manufacturer, or his qualified representative, shall provide such
supervision as may be

necessary to assure correct installation and adjustment of the isolation
equipment, inspect the installation in operation, and submit a report in writing certifying the
correctness of installation and compliance with approved submittal data, and indicatin
g the
actual measured isolator deflection compared with that predicted and that specified.

D.

The vibration isolation manufacturer and his representative shall have been engaged in the
business of vibration isolation for no less than 5 years. Products sha
ll be standard cataloged
items with factory certified ratings.


1.4

SUBMITTALS
:

A.

Submit the following data for approval, clearly identifying each item of equipment supported and
the isolation to be installed at each point of su
pport.

1.

Floor span if the equipment is to be supported by structure above grade.

2.

Horsepower of each motor, and rpm of both driven and driver, in each supported unit.

3.

Calculated horsepower transmitted to the structure through the vibration isolat
ion as
applied.

4.

Calculated static load of each isolator, in pounds.

5.

Deflection recommended by the ASHRAE Systems Guide, in inches.

6.

Scheduled deflection of each isolator. Identification of each isolator selected by model
number and spring color
.

7.

Deflection of each isolator under the calculated load, actual loaded and unloaded
measurable spring height.

8.

The loading at which each isolator would be fully compressed to solid.

9.

The load at which each isolator would operate at the deflection

recommended by the
ASHRAE Guide, and at scheduled deflection.

10.

Shear stress at solid, calculated stress as applied, and maximum allowable stress for
infinite cycle life classification.

11.

Horizontal stiffness KX, vertical stiffness KY, at calculated

load at each isolator.

12.

Calculated lateral load imposed on each isolator, and lateral deflection under load.

13.

Design details of lateral restraints.

14.

Factory certified data to allow submitted conditions of selection to be easily verified, with

calculations.

15.

Complete base details.

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16.

Complete flexible connection details.

B.

If an increase or decrease in calculated load of 20 percent would cause the mount to deflect
more than 75 percent of full range
-

or to deflect less than called for b
y this Specification, submit
an alternate selection.



PART 2
-

PRODUCTS


2.1

ACCEPTABLE MANUFACTURERS
:

A.

Amber
-
Booth Co., Kinetics Corp., Korfund Dynamics Corp., Mason Industries, Vibrat
ion
Eliminator, Inc.


2.2

VIBRATION ISOLATOR GENERAL REQUIREMENTS
:

A.

All vibration isolators shall have either known undeflected heights or other markings so that after
adjustment, when carrying thei
r load, the deflection under load can be verified, thus determining
that the load is within the proper range of the device and that the correct degree of vibration
isolation is being provided according to the design.

B.

All isolators shall operate in the
linear portion of their load versus deflection curve. Load versus
deflection curves shall be furnished by the manufacturer and shall be linear over a deflection
range 50% above the design deflection.

C.

The ratio of lateral to vertical stiffness shall no
t be less than 1.0 or greater than 2.0.

D.

The vertical natural frequency for each support point, based upon the load per isolator and
isolator stiffness, shall not differ by more than plus or minus 10%.

E.

Wave motion through the isolator shall be reduc
ed to the following extent:

1.

Isolation above the resonant frequency shall follow the theoretical prediction based upon
an undamped single, degree of freedom system, with a minimum isolation of 50 decibels
above 150 cycles per second.

F.

All vibration iso
lation shall be designed to provide a minimum of 95 percent efficiency.


2.3

FIBERGLASS ISOLATORS
:

A.

Precompressed molded fiberglass noise and vibration isolators, individually coated with a flexible
moisture imperviou
s elastomeric membrane. Material shall be manufactured specifically for
isolation purposes, shall be produced in a range of density and spring rate to afford load
bearing capacities from 1 to 500 psi. Natural frequency of isolators as applied shall be 12

Hertz
or less.


2.4

NEOPRENE ISOLATORS
:

A.

Neoprene shall be bridge bearing quality, 40 durometer unless specified otherwise, with a Shore
hardness of 50 to 60 after minimum aging of 20 days or corresponding over aging.


2.5

STEEL SPRINGS
:

A.

Springs shall be of the stable type having horizontal stiffness at least equal to the vertical
stiffness. Each isolator shall be so selected that static deflection is no greater than 75 percent
of tota
l deflection from free height to fully compressed or "solid". Shear stress at solid shall be
sufficiently low that the spring does not exceed its elastic limit and is certified by the
manufacturer for infinite cycle life classification. Springs shall be
coated in colored PVC. Colors
shall be chosen such that each spring is visibly identifiable by color and physical size.


2.6

FLOOR MOUNTS
:

A.

Floor mounted spring isolators shall be of the open type without horizontal restraint

unless
specified otherwise. Where indicated, limit stops shall be provided to limit motion of the
supported equipment when the load is temporarily lessened or when equipment is subjected to
external forces. Floor mounts may be of the single or multispri
ng type so designed to force
concentration of the supported load at the center of support. Floor mounted isolators shall be

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equipped with a glued
-
on neoprene sound pad on the bottom. Floor mounts shall be so
selected that no more than l
-
inch of adjustmen
t is required to level the equipment.


2.7

HANGERS
:

A.

Hangers may be of the open or box type. Metal
-
to
-
metal contact between the supporting rods
and hanger components shall be prevented by neoprene inserts. Box hangers shall be
d
esigned to withstand temporary loading of 400 percent of the design load without visible
deformation. Spring hangers shall be so selected that no more than l
-
inch of adjustment is
required to level equipment.


2.8

CORROSION PROTECTION
:

A.

Vibration isolators shall be designed or treated for resistance to corrosion.

B.

Steel components shall be PVC coated, or phosphated and painted with industrial grade
enamel. Nuts, bolts and washers shall be zinc electroplated. Struc
tural steel bases shall be
thoroughly cleaned of welding slag and primed with zinc chromate or metal etching primer. A
finish coat of industrial enamel shall be applied over the primer.

C.

Isolators exposed to the weather shall have steel parts PVC coate
d, hot
-
dip galvanized or zinc
electroplated plus coating of neoprene or bitumastic paint. Aluminum components for outdoor
installation shall be etched and painted with industrial grade enamel. Nuts, bolts and washers
shall be zinc electroplated. Coiled
steel sptings shall not be hot dip galvanized.


2.9

BRACKETS
:

A.

Where height saving brackets for side mounting of isolators are specified, the height saving
brackets shall be designed to provide for an operating clearance of 1
-
inc
h under the base and
designed so that the isolators can be installed and removed without moving the machine when
the operating clearance is 1
-
inch and the base is supported on shims. The operating distance
between the top of the isolator spring compressio
n plate and the underneath side of the bracket
shall not exceed 2
-
1/2
-
inches in any case. When used with spring isolators having a deflection
of 2
-
1/2
-
inches or more, the height saving brackets shall be of the precompression type to limit
exposed bolt len
gth between the top of the isolator and the underneath side of the bracket.


2.10

DESIGN REQUIREMENTS
:

A.

Isolators supporting a given piece of equipment shall be selected for approximately equal spring
deflection.

B.

Isolators for equipment installed out
-
of
-
doors shall be designed to provide adequate restraint
due to normal wind conditions and to withstand wind loads of 30 pounds per square foot applied
to any exposed surface of the equipment without failure.

C.

Hori
zontal deflection of isolators under operating conditions shall not exceed 2 percent of the
height of the loaded elastic element. Provide stabilizers if necessary to limit such horizontal
movement to 2 percent or 1/4
-
inch, whichever is least.


2.11

TYPE
HSN ISOLATORS
:

A.

A spring hanger, consisting of a rectangular steel box, coil spring, spring cups, neoprene
impregnated fabric washer, and steel washer, with an elastomeric element at the top of the box
for acoustic isol
ation. The design shall be such as to prevent metal
-
to
-
metal contact between
the hanger rod and the top of the hanger box. The elastomeric element shall be designed for
approximately 1/4
-
inch deflection and loaded so that deflection does not exceed 15 pe
rcent of
the free height of the element.

B.

Mason Type W3 ON.


2.12

TYPE HSNT ISOLATORS
:

A.

A combination spring and elastomeric hanger consisting of a rectangular steel box, coil spring,
spring cups, neoprene impregna
ted fabric washer, and steel washer, with an elastomeric
element at the top of the box for acoustic isolation. The design shall be such as to prevent
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metal
-
to
-
metal contact between the hanger rod and the top of the hanger box. The elastomeric
element sha
ll be designed for approximately 1/4
-
inch deflection and loaded so that deflection
does not exceed 15 percent of the free height of the element. Provide a load transfer plate to
hold the equipment or piping at a fixed elevation during installation and to
permit transferring the
load to the spring after installation.


2.13

TYPE MPF ISOLATORS
:

A.

A pad type mounting of precompressed molded fiberglass individually coated with a flexible
moisture impervious elastomeric membr
ane. Bolting not required. Pad loading shall be such as
required to produce at least the scheduled deflection and result in level equipment mounting at
static deflection between 10 and 40 percent of unloaded thickness.


2.14

TYPE MSO ISOLATORS
:

A.

An adjustable, free standing, open spring mounting with combination leveling bolt and equipment
fastening bolt. The spring (or springs) shall be rigidly attached to mounting baseplate and to the

spring compression plate. The

isolator shall be designed for a minimum of KX/KY (horizontal to
vertical spring rate) of 1.0. A neoprenepad having a minimum thickness of 1/4
-
inch shall be
bonded to the baseplate. Baseplates shall be sized to limit pad loading to 100

psi.

B.

Mason Ty
pe SLF.


2.15

TYPE ND ISOLATORS:

A.

Double deflection neoprene mountings shall have a minimum static deflection of 0.35". All metal
surfaces shall be neoprene covered to avoid corrosion and have friction pads both top and
bottom. Bolt holes shall be pr
ovided for bolting to housekeeping pads. On equipment such as
transformers, steel rails shall be used above the mounting to compensate for the overhang.

B.

Mountings shall be type ND or rails type DNR as manufactured by Mason Industries, Inc.


2.16

TYPE
RCS ISOLATORS
:

A.

Roof curb isolation consisting of two high strength aluminum rail sections in parallel with a
continuous neoprene air seal and coil spring isolators spaced around the periphery between the
two rails. B
ottom rail shall mount directly to the top of the curb and top rail shall support
eguipment. Entire assembly shall be weatherproof, air and water tight. Provide restraining clips
for equipment holddown.

B.

Mason Type CMAB.


2.17

BASE TYPES
:

A.

Base types for machinery mounting shall be as scheduled. The bases shall comply with the
following description for each type required on the project.

B.

The inertia base shall be sized to extend a minimum of 4
-
inches beyond the base of
the
equipment, and in the case of belt driven equipment 4
-
inches beyond the end of the drive shaft.

C.

Concrete inertia bases for pumps shall be sized to support the suction elbow of end suction
pumps and both the suction and discharge elbows of horizonta
l split
case pumps. The bases
shall be T
-
shaped where necessary to conserve space.


2.18

TYPE B BASE
:

A.

Brackets
-

Gusseted welded steel brackets bolted or welded directly to equipment, and arranged
to accommodate isolators s
pecified without raising equipment but 1
-
inch from floor or pad.


2.19

TYPE HSC BASE
:

A.

Height Saving Concrete
-

A concrete inertia base, consisting of a perimeter steel pouring form,
reinforcing bars welded in place, boltin
g templates, and height saving brackets for side mounting
of the isolators. The perimeter steel members shall be structural channels having a minimum
depth of 1/12 of the longest span, but not less than 6
-
inches deep.



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2.20

TYPE SSF BASE
:

A.

Steel Suspension Frame
-

A structural steel base constructed of angle iron or channels,
designed to spread base area of equipment to increase stability and/or permit suspension with
hanger rods.


2.21

FLEXIBLE PIPING CONNECTORS
:

A.

Shall have same or higher pressure rating as piping system in which installed.

B.

Type FC
-

1.

Flexible spherical neoprene pipe connectors manufactured of multiple plies of nylon tire
cord fabric and neoprene both mol
ded and cured in hydraulic rubber presses. No steel
wire or rings shall be used as pressure reinforcement. Straight connectors shall have two
spheres. Neoprene elbows shall be manufactured with a single sphere forming the corner
of the joint itself. Co
nnectors up to and including 2
-
inch diameter may have threaded
ends. Connectors 2
-
1/2
-
inch and larger shall be manufactured with floating steel flanges
recessed to lock the connector's raised face neoprene flanges.

2.

All connectors shall be rated a mini
mum of 150

psi at 220

F. All straight through
connections shall be made with either flanged or screwed twin spheres properly
preextended as recommended by the manufacturer to prevent additional elongation under
pressure. Size 12
-
inch and larger operating

at pressure above 100

psi shall employ
control cables with end fitting isolated from the anchoring plates by means of 1/2
-
inch thick
bridge bearing neoprene washer bushings designed for a maximum of 1000

psi.

3.

Mason
-
Flex Type MFTFU or MFTNC, and contro
l cable assemblies Type ACC.



PART 3
-

EXECUTION


3.1

CONCRETE WORK
:

A.

Where housekeeping pads are not poured integrally with the floor slab, construct housekeeping
pads at least 4
-
inches high, u
nless otherwise noted herein, reinforced with No.

3 steel wire mesh
6

x

6
-
inches, fastened to structural slabs with 1/2
-
inch diameter bolts embedded in structural
slabs with expansion bolts at all corners (inset 3
-
inches) and no farther apart than 18
-
inche
s.
Score structural slab thoroughly to assure concrete bonding between structural slab and
housekeeping pad. Construct in full accordance with "Concrete" Section. Finish tops of
housekeeping pads smooth and level within 1 percent of span. Provide house
keeping pads for
-

1.

Each floor mounted fan.

2.

Each base mounted pump.

3.

Each air compressor unit.

4.

Each floor mounted air handling unit.

5.

Miscellaneous equipment indicated to be pad mounted.

B.

Housekeeping pads which are an integral part of t
he floor slab will be furnished, installed, and
left in a finished condition under another Section of the Work. Coordinate the dimensions
required for the equipment actually furnished and provide anchor bolts and templates.

C.

Provide concrete inertia bl
ocks, affixed to a piece of moving equipment or rotating equipment,
and then isolated from the building structure, or from the housekeeping pad. Inertia blocks shall
be not less than 4
-
inches in thickness, nor weigh less than three times the weight of all
the
equipment mounted thereon, (unless specified otherwise) and shall be constructed of reinforced
standard dense aggregate concrete weighing not less than 140 pounds per cubic foot. Provide
a structural steel or rigid sheet metal form with (at least) 1/2
-
inch centers both ways.

D.

Provide anchor bolts for equipment mounted directly on concrete. Anchor bolts shall be
embedded in concrete (length as necessary for applied anchor bolt loading) and equipment
shall be bolted down firmly.


3.2

EQUIPMENT ISOLA
TOR INSTALLATION
:

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A.

The installation or use of vibration isolators shall not cause any change of position of equipment
or piping which would result in stresses in piping connections or misalignment of shafts
or
bearings. Maintain equipment and piping in a rigid position during installation. The load shall
not be transferred to the isolator until the installation is complete and under full operational load.

B.

Support the machine to be isolated by base or by

brackets, attached directly to the machine,
where no other base is required.

C.

Provide brackets to accommodate the isolator and provide a mechanical stop. The vertical
position and size of the bracket shall be specified by the isolator manufacturer.

D.


The operating clearance between the bracket and the housekeeping pad or floor shall be
3/8
-
inch plus or minus 1/16
-
inch. The minimum operating clearance between the base and the
pad or floor shall be 1
-
inch.

E.

Place the base in position and support th
e brackets temporarily by 3/8
-
inch shims prior to the
installation of the machine or isolators.

F.

Install the isolators without raising the machine and base assembly.

G.

After the entire system installation is completed and under full operational load,

adjust the
isolator so that the load is transferred from the shims to the isolator. When isolators are
properly adjusted, the shims will be barely free. The shims shall be used as a gage to check
that the 3/8
-
inch clearance is maintained so that the sys
tem will remain free of stress. Remove
the shims.

H.

Install and adjust horizontal snubbers or lateral restraints on machinery subject to lateral loads in
excess of the isolator capacity.


3.3

PIPE PENETRATION
:

A.

Provide re
silient weatherproof seals on all pipe floor and wall penetration exiting interior of
building.

B.

Provide 40 durometer neoprene resilient sleeves on all mechanical room wall and floor pipe
penetrations.


3.4

PIPE ISOLATION
:

A
.

Isolate each connected pipe for the first four hangers or supports from any piece of isolated
equipment. Static deflection for these isolators shall be the same as specified for the
equipment.

B.

Pipe Riser Supports
-

Isolate pipe risers as scheduled
to both isolate the pipe for sound
transmission and allow for vertical pipe extension and contraction. Isolation shall consist of
Type

MSO isolators supporting each end of extension riser clamps. Top and bottom of each
isolated riser shall be isolated an
d intermediate isolators shall be spaced not to exceed 4 floors
between isolators. Provide auxiliary structural supports as necessary for isolation mounting and
for articulation with the building structure. All the isolators on any riser shall be adjuste
d to
support equal loads during normal system operation.


3.5

DUCT PENETRATION
:

A.

Provide 40 durometer neoprene resilient sleeves for each supply and return air duct penetrating
mechanical room walls or floors.


3.6

DUCT
ISOLATION
:

A.

Isolate supply air ducts from air handling units operating at more than 3
-
inches discharge static
pressure (i.e., 3
-
inches static pressure at fan or unit discharge connection).

1.

The stanchions supporting such
ducts in equipment rooms and the first two support points
in vertical risers shall rest on 1/2
-
inch deflection type MPF mounts.

2.

Provide 1
-
1/2
-
inch deflection Type

HSN hangers for the first 4 hangers from the fan for
such ducts. Select isolators as req
uired to accommodate duct fittings and sound
attenuators.


3.7

PIPING ISOLATOR INSTALLATION
:


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A.

Supported
-

The installation procedure is similar to the equipment isolator installation
procedures.

B.

Suspended
-

1.

Install the isolators with the isolator hanger box as close as possible to the structure.

2.

Suspend the isolators from massive beams, never from slab diaphragms between beams.

3.

Align hanger rods to clear the hanger box, plumb and centered in open
ings.

4.

Load transfer isolators, when utilized, shall temporarily maintain the load in a rigid position
until installation is complete and fully loaded.


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3.8

UNSCHEDULED REQUIREMENTS
:

A.

Equipment, system, constr
uction or condition that may be altered, added or changed, or that is
not specifically considered herein, or on the Drawings, shall be treated in a manner which is
similar to that set out for similar equipment, system, construction or condition.

B.

Provid
e lateral restraints (snubbers) wherever required to prevent excessive equipment
dislocation due to thrusts during operation (such as fans).


3.9

VIBRATION ISOLATION SCHEDULE
:

A.

Specific Project requirements ar
e scheduled below. Provide types of isolators and bases in
accordance with the Specifications for each in Part 2. Minimum isolator deflections are
scheduled in inches.


EQUIPMENT

BASE

ISOLATOR

DEFLECTION

(Inches)


1.


Secondary Chilled Water Pumps

HSC


MSO


1.5


2.


Receiver Mounted Condensate Pumps

B


MPF


0.4


3.


In
-
Line Pumps

--


HSNT


1.0


4.


Base Mounted Pumps

HSC


MSO


1.0


5.


House Pump Unit

HSC


MSO


1.5


6.


Suspended Supply and/or Exhaust Fans

SSF


HSNT


1.5


7.


Suspended Air Hand
ling Units

--


HSNT


2.0


8.


Floor Mounted Air Handling Units

B


MSO


2.0


9.


Roof Mounted Vent Sets

B


MSO


1.5


10.

Roof Curb Mounted Fans

--


RCS


1.5


11.

Suspended Cabinet Fans

--


HSNT


1.5


12.

Suspended In
-
Line Fans

--


HSN


2.0


13.

Centrifugal Exhaust Fans

B


MSO


1.5


14.

Instrument Air Compressor

HSC


MSO


2.0


15.

Suspended Cabinet Heaters

--


HSNT


1.0


16.

Suspended Entrance Heaters

--


HSNT


1.0


17.

Chilled Water Risers

--


MSO


1.0


18.

General Air Compressor Unit

HSC


MSO


2.0


19.

Chilled Water Piping Within Mechanical

Room and at AHU and Pumps and

Machines (4 Hangers each)

--


HSNT


1.0


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20.

Steam Piping and Condensate Return

Piping Within Mechanical Room

--


HSNT


1.0


21.

Floor Mounted Dry Type Transforme
rs

above 125 KVA

--


MSO


1.0


22.

Floor Mounted Dry Type Transformers

125 KVA and Smaller

--


ND


0.35


23.

Suspended Dry Type Transformers

--


HSN


1.0
































END OF SECTION