SECTION 23 21 13 HYDRONIC PIPING

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SECTION 23 21 13



HYDRONIC

PIPING

PART 1
-

GENERAL

1.1

WORK INCLUDED

A.

This Section includes pipin
g systems for hot water heating and

blow
-
down drain lines
. Piping
materials and equipment specified in this Section include:

1.

Piping and fittings
.

2.

Air vents
.

B.

The following

Division
-
23

sections apply to this section:

1.

Mechanical General Provisions

2.

Basic Mechanical Materials and Methods.

3.

General Duty Valves.

4.

Supports and Anchors.

C.

Related Sections: The following sections contain require
ments that relate to this Section:

1.

Divis
ion
31

Section
"Earth

Moving


for trenching and backfilling materials and methods
for underground piping installations.

2.

Division 23

Section "Basic Mechanical Materials and Methods" for materials and methods
for sealing pipe penetrations through basement wa
lls, and fire and smoke barriers.

3.

Division 23

Section "General Duty Valves" for gate, globe, ball, butterfly, and check
valves.

4.

Division 23

Section "
Basic Mechanical Materials and Met
hods
" for labeling and
identification of hydronic piping system.

5.

Division

23

Section "Mechanical Insulation" for pipe insulation.

1.2

DEFINITIONS

A.

Pipe sizes used in this Specification are Nominal Pipe Size (NPS).

1.3

SYSTEM DESCRIPTION

A.

General: The hydronic piping systems are

the "water
-
side" of an air
-
and
-
water or all
-
water
heating system. Hydronic piping systems specified in this Section include hot water
piping
system
. These systems are classified by ASHRAE as Low Water Tempera
ture, Forced,
Recirculating systems.

1.4

SUBMITTALS

A.

Product Data including rated capacities of selected models, weights (shipping, installed, and
operating), furnished specialties and accessories, and installation instructions for each hydronic
specialty and special duty valve speci
fied.

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1.

Furnish flow and pressure drop curves for diverting fittings and calibrated plug valves,
based on manufac
turer's testing.

B.

Maintenance Data for hydronic specialties and special duty valves, for inclusion in operating
and maintenan
ce manual specifi
ed in Division 1 and Division
-
23

Section "Mechanical General
Provisions."

C.

Welders certificates certifying that welders comply with the quality requirements specified in
Quality Assurance below.

D.

Certification of compliance with ASTM and ANS
I manufacturing require
ments for pipe, fittings,
and specialties.

E.

Reports specified in Part 3 of this Section.

1.5

QUALITY ASSURANCE

A.

Regulatory Requirements: Comply with the provisions of the following:

1.

ASME B 31.9 "Building Services
Piping" for materials, products, and installation. Safety
valves and pressure vessels shall bear the appropriate ASME label.

2.

Fabricate and stamp air separators and compression tanks to comply with ASME Boiler
and Pressure Vessel Code, Selection VIII, Divi
sion 1.

3.

ASME "Boiler and Pressure Vessel Code", Section IX, "Welding and Brazing
Qualification" for qualifications for welding processes and operators.

4.

Local, City, and State Codes.

1.6

SEQUENCING AND SCHEDULING

A.

Coordina
te the size and location of concrete
inserts
. Concrete, reinforcement, and formwork
requirements
are specified i
n Division
3

Section “
Cast
-
In
-
Place Concrete
”.

PART 2
-

PRODUCTS

2.1

MANUFACTURERS

A.

Manufacturer: Subject to compliance with requirements, provide hydronic piping system
products from one of the following:

1.

Air Vents (manual and automatic):

a.

Armstrong Machine Works.

b.

Bell & Gossett ITT; Fluid Handling Div.

c.

Hoffman Specialty ITT; Fluid Handl
ing Div.

d.

Spirax Sarco.

2.

Dielectric Waterway Fittings:

a.

Victaulic Company of America

3.

Dielectric Unions:

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a.

Perfection Corp.

b.

Watts Regulator Co.

2.2

PIPE AND TUBING MATERIALS

A.

General: Refer to Part 3 Article "PIPE APPLICATIONS
" for identifica
tion of where the below
materials are used.

B.

Drawn Temper Copper Tubing: ASTM B 88, Type L.

C.

Annealed Temper Copper Tubing: ASTM B 88, Type K.

D.

Steel Pipe: ASTM A 53, Schedule 40, seamless, black steel pipe, plane ends.

2.3

FITTINGS

A.

Cast
-
Iron Threaded Fittings: ANSI B16.4, Class 125, standard pattern, for threaded joints.
Threads shall conform to ANSI B1.20.1.

B.

Malleable
-
Iron Threaded Fittings: ANSI B16.3, Class 150, standard pattern, for threaded joints.
Threads shall co
nform to ANSI B1.20.1.

C.

Steel Fittings: ASTM A 234, seamless or welded, for welded joints.

D.

Wrought
-
Copper Fittings: ANSI B16.22, streamlined pattern.

E.

Cast
-
Iron Threaded Flanges: ANSI B16.1, Class 125; raised ground face, bolt holes spot faced.

F.

Cast Bronz
e Flanges: ANSI B16.24, Class 150; raised ground face, bolt holes spot faced.

G.

Steel Flanges and Flanged Fittings: ANSI B16.5, including bolts, nuts, and gaskets of the
following material group, end connection and facing:

1.

Material Group: 1.1.

2.

End Connect
ions: Butt Welding.

3.

Facings: Raised face.

H.

Unions: ANSI B16.39 malleable
-
iron, Class 150, hexagonal stock, with ball
-
and
-
socket joints,
metal
-
to
-
metal bronze seating surfaces; female threaded ends. Threads shall conform to ANSI
B1.20
.1.

I.

Dielectric Unions: Threaded or soldered end connections for the pipe materials in which
installed; constructed to isolate dissimilar metals, prevent galvanic action, and prevent
corrosion.

2.4

JOINING MATERIALS

A.

Solder Filler Metals: A
STM B 32, 95
-
5 Tin
-
Antimony, for chilled water, condenser water,
heating hot water, low pressure steam, make
-
up water and drain piping.

B.

Brazing Filler Metals: AWS A5.8, Classification BAg 1 (Silver).

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1.

WARNING: Some filler metals contain compounds which pr
oduce highly toxic fumes
when heated. Avoid breathing fumes. Provide adequate ventilation.

C.

Welding Materials: Comply, with Section II, Part C. ASME Boiler and Pressure Vessel Code for
welding materials appropriate for the wall thickn
ess and chemical analysis of the pipe being
welded.

D.

Gasket Material: Thickness, material, and type suitable for fluid to be handled, and design
temperatures and pressures.

2.5

GENERAL DUTY VALVES

A.

General duty valves (i.e., check, ball, and

butterfly valv
es) are specified in Division
-
23

Section
"General Duty Valves." Special duty valves are specified below by their generic name; refer to
Part 3 Article "VALVE APPLICATION" for specific uses and applica
tions for each valve
specified.

2.6

HYDRONIC SPECIALTIES

A.

Manual Air Vent: Bronze body and nonferrous internal parts; 150 psig working pressure, 225
degree F operating temperature; manually operated with screwdriver or thumbscrew; and
having 1/8 inch discharg
e connec
tion and 1/2 inch inlet connection.

PART 3
-

EXECUTION

3.1

PIPE APPLICATIONS

A.

Install Type L, drawn copper tubing with wrought copper fittings and solder joints for 2 inch and
smaller, above ground, within building. Inst
all Type K, annealed temper copper tubing for 2 inch
and smaller without joints, below ground or within slabs.

B.

Install steel pipe with threaded joints and fittings for 2 inch and smaller, and with welded joints
for 2
-
1/2 inch and larger.

3.2

PIPING INSTALLATIONS

A.

Locations and Arrangements: Drawings (plans, schematics, and diagrams) indicate the general
location and arrangement of piping systems. Locations and arrangements of piping take into
consideration pipe sizing and friction loss,
expansion, pump sizing, and other design considera
-
tions. So far as practical, install piping as indicated.

B.

Use fittings for all changes in direction and all branch connections.

C.

Install exposed piping at right angles or parallel to building walls. Diagon
al runs are not
permitted, unless expressly indicated.

D.

Conceal all pipe installations in walls, pipe chases, utility spaces, above ceilings, below grade or
floors, unless indicated to be exposed to view.

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E.

Install piping tight to slabs, beams, joists, column
s, walls, and other permanent elements of the
building. Provide space to permit insulation applications, with 1" clearanc
e outside the
insulation.

F.

Locate groups of pipes parallel to each other, spaced to permit applying insulation and servicing
of valves.

G.

Install drains at low points in mains, risers, and branch lines consisting of a tee fitting, 3/4" ball
valve, and short 3/4" threaded nipple and cap.

H.

Install piping at a uniform grade of 1 inch in 40 feet upward in the direction of flow.

I.

Make reductions i
n pipe sizes using eccentric reducer fitting installed with the level side up.

J.

Install branch connections to mains using Tee fittings in main with take
-
off out the bottom of the
main, except for up
-
feed risers which shall have take
-
off out the top of the m
ain line.

K.

Install unions in pipes 2 inches and smaller, adjacent to each valve, at final connections each
piece of equipment, and elsewhere as indicated. Unions are not required on flanged devices.

L.

Install dielectric unions to join dissimilar metals.

M.

Inst
all flanges on valves, apparatus, and equipment having 2
-
1/2 inches and larger connections.

3.3

HANGERS AND SUPPORTS

A.

General: Hanger, supports, and anchors devices are specified

in Division 23

Section
"SUPPORTS AND ANCHORS." Conform to th
e table below for maximum spacing of supports:

B.

Install the following pipe attachments:

1.

Adjustable steel clevis hangers for individual horizontal runs less than 20 feet in length.

2.

Adjustable roller hangers and spring hangers for individual horizontal runs 2
0 feet or
longer.

3.

Pipe roller complete
-

MSS Type 44 for multiple horizontal runs, 20 feet or longer,
supported on a trapeze.

C.

Install hangers with the following minimum rod sizes and maximum spacing:

Nom. Pipe Size

Max. Span
-
Ft.

Min. Ro
d Size
-
Inches


1

7

3/8


1
-
1/2

9

3/8


2

10

3/8


3

12

1/2


3
-
1/2

13

1/2


4

14

5/8


5

16

5/8


6

17

3/4

3.4

PIPE JOINT CONSTRUCTION

A.

Soldered Joints: Comply with the procedures contained in the AWS "Soldering Manual."

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B.

Brazed Joints: Comply
with the procedures contained in the AWS "Brazing Manual."

1.

CAUTION: Remove stems, seats, and packing of valves and accessi
ble internal parts at
piping specialties before brazing.

2.

Fill the pipe and fittings during brazing, with an inert gas (i.e., nitroge
n or carbon dioxide)
to prevent formation of scale.

3.

Heat joints using oxy
-
acetylene torch. Heat to proper and uniform temperature.

C.

Threaded Joints: Conform to ANSI B1.20.1, tapered pipe threads for field cut threads. Join
pipe fittin
gs and valves as follows:

1.

Note the internal length of threads in fittings or valve ends, and proximity of internal seat
or wall, to determine how far pipe should be threaded into joint.

2.

Align threads at point of assembly.

3.

Apply approximate tape or thread c
ompound to the external pipe threads (except where
dry seal threading is specified).

4.

Assemble joint wrench tight. Wrench on valve shall be on the valve end into which the
pipe is being threaded.

a.

Damaged Threads: Do not use pipe with threads which are cor
roded or damaged.
If a weld opens during cutting or threading operations, that portion of pipe shall not
be used.

D.

Welded Joints: Comply with the requirement in ASME Code B31.9
-
"Build
ing Services Piping."

E.

Flanged J
oints: Align flanges surfaces parallel. Assemble joints by sequencing bolt tightening
to make initial contract of flanges and gaskets as flat and parallel as possible. Use suitable
lubricants on bolt threads. Tighten bolts gradually and uniformly using

torque wrench.

3.5

VALVE APPLICATIONS

A.

General Duty Valve Applications: The Drawings indicate valve types to be used. Where
specific valve types are not indicated the following requirements apply:

1.

Shut
-
off duty: use ball, and butterfly v
alves

2.

Install shut
-
off duty valves at each branch connection to supply mains, at supply
connection to each piece of equipment, and elsewhere as indicted.

B.

Install drain valves at low points in mains, risers, branch lines, and elsewhere as required for
syste
m drainage.

3.6

HYDRONIC SPECIALTIES INSTALLATION

A.

Install manual air vents at high points in the system, at heat transfer coils, and elsewhere as
required for system air venting. For unacces
sible

vent locations, the vent piping shall be piped
to a location where vent will be accessible.

3.7

FIELD QUALITY CONTROL

A.

Preparation for testing: Prepare hydronic piping in accordance with ASME B 31.9 and as
follows:

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1.

Leave joints including w
elds uninsulated and exposed for examina
tion during the test.

2.

Provide temporary restraints for expansion joints which cannot sustain the reactions due
to test pressure. If temporary restraints are not practical, isolate expansion joints from
testing.

3.

Flu
sh system with clean water. Clean strainers.

4.

Isolate equipment that is not to be subjected to the test pressure from the piping. If a
valve is used to isolate the equipment, its closure shall be capable of sealing against the
test pressure without damage

to the valve. Flanged joints at which blinds are inserted to
isolate equipment need not be tested.

5.

Install relief valve set at a pressure no more than 1/3 higher than the test pressure, to
protect against damage by expansion of liquid or other source of
overpressure during the
test.

B.

Testing: Test hydronic piping as follows:

1.

Use ambient temperature water as the testing medium, except where there is a risk of
damage due to freezing. Another liquid may be used if it is safe for workmen
and
compatible with the piping system components.

2.

Use vents installed at high points in the system to release trapped air while filling the
system. Use drains installed at low points for complete removal of that liquid.

3.

Examine system to see that equipme
nt and parts that cannot withstand test pressures
are properly isolated. Examine test equipment to ensure that it is tight and that low
pressure filling lines are disconnected.

4.

Subject piping system to a hydrostatic test pressure which at every point in t
he system is
not less than 1.5 times the design pressure. The test pressure shall not exceed the
maximum pressure for any vessel, pump, valve, or other component in the system under
test. Make a check to verify that the stress due to pressure at the bott
om of vertical runs
does not exceed either 90 percent of specified minimum yield strength, or 1.7 times the
"SE" value in Appendix A of ASME B31.9, Code For Pressure Piping, Building Services
Piping.

5.

After the hydrostatic test pressure has been applied for

at least 10 minutes, examine
piping, joints, and connections for leakage. Eliminate leaks by tighten
ing, repairing, or
replacing components as appropriate, and repeat hydrostatic test until there are no leaks.

3.8

ADJ
USTING AND CLEANING

A.

Clean and flush hydronic piping systems. Remove, clean, and replace strainer screens. After
cleaning and flushing hydronic piping system, but before balancing, remove disposable fine
mesh strainers in pump suction diffusers.

3.9

COMMISSIONING

A.

Fill system and perform initial chemical treatment.

B.

Check expansion tanks to determine that they are not air bound and that the system is
completely full of water.

C.

Before operating the system perform these steps:

1.

Open valves to ful
l open position. Close coil bypass valves.

2.

Remove and clean strainers.

3.

Set automatic fill valves for required system pressure.

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4.

Check air vents at high points of systems and determine if all are installed and operating
freely (automatic type) or to bleed a
ir completely (manual type).

END OF SECTION 23 21 13