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CONTRACT TITLE
SECTION 15520
STEAM SYSTEMS AND EQUIPMENT
PART I - GENERAL
1.01
WORK INCLUDED
A.
1.02
1.03
Types of steam systems and equipment specified in this Section include the following:
1.
Steam Piping
2.
Condensate Piping
3.
Steam Traps and Drip Sets
4.
Pressure Reducing Valves
5.
Condensate Receiver and Pump Unit
QUALITY ASSURANCE
A.
Manufacturer's Qualifications: Firms regularly engaged in manufacture of steam and
condensate piping products of types, materials, and sizes required, whose products have
been in satisfactory use in similar service for not less than 5 years.
B.
Requirements of Regulatory Agencies:
C.
ASME Compliance: Fabricate and install steam and condensate piping in accordance
with ASME B31.9 "Building Services Piping."
D.
Fabricate and install steam and condensate piping in accordance with 2001 California
Mechanical Code.
SUBMITTALS
A.
Product Data: Submit manufacturer's technical product data and installation instructions
for each type of steam and condensate pipe.
B.
Record Drawings: At project closeout, submit Record Drawings of installed piping
systems, in accordance with requirements of Division 1.
PART II - PRODUCTS
2.01
MATERIALS
A.
Provide piping materials and factory-fabricated piping products of sizes, types, pressure
ratings, temperature ratings, and capacities as indicated. Provide materials and products
complying with ASME B31.9 Code for Building Services Piping where applicable, base
pressure rating on steam and condensate piping systems maximum design pressures or
as specified. Provide sizes and types matching piping and equipment connections;
provide fittings of materials which match pipe materials used in steam and condensate
piping systems.
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2.02
BASIC PIPES AND PIPE FITTINGS
A.
2.03
2.04
Provide pipes and pipe fittings complying with Division 15 Basic Mechanical Materials
and Methods section "Pipes and Pipe Fittings," in accordance with the following listing:
1.
Steam Piping at 15 psig and below: ASTM A53 black steel Schedule 40. Pipe
sizes 2” and smaller - Schedule 80 black steel pipe with wrought-steel,
buttwelding fittings. On pipe sizes 2-½” and larger, standard-weight, full-radius,
butt-welding fittings and weld neck flanges.
2.
Steam Piping above 15 psig: ASTM A53 black steel Schedule 40. Provide
wrought-steel buttwelding fittings for all pipe sizes. Steam piping 1" and less shall
be Schedule 80.
3.
Condensate Return and Pumped Condensate Piping: ASTM A53 or ASTM A120
black steel Schedule 80. On pipe sizes 2” and smaller 125-lb, cast-iron,
threaded, steam pattern fittings.
4.
Steam and Condensate Return Piping Below Grade: Encased in prefabricated
insulated piping system with FRP jacket as manufactured by Perma-Pipe Co., or
equal. Piping shall be all welded construction. Insulation shall be 2-½” thick
calcium silicate or mineral wool. Casing shall be 10 gauge black steel with all
welded seams. All fittings shall be prefabricated and assembled by manufacturer.
Field joints shall be made as follows: Join inner and outer pipes together by
welding; cover bare pipe section with matching half sections of insulation; cover
casing seams with conduit closure sleeve supplied with piping, and weld all joints
and seams. Complete installation shall be as recommended by manufacturer,
including terminals, anchors, etc. Manufacturer's field representative shall be
present at unloading and for all critical phases of piping installation, such as
making field joints, and at final inspection of piping, before backfilling of trench.
STEAM TRAPS AND DRIP SETS
A.
Provide steam traps and drip sets as shown on Drawings and as specified herein. Size
traps in accord with required capacities and pressure differentials given on Drawings.
Equip traps with ASTM - A278 Class 30 cast iron bodies, chrome steel valves and
stainless steel seats.
B.
Manufacturers: TLV, Sarco or equal.
PRESSURE REDUCING SETS
A.
Complete with valves, strainers, gauges and fittings.
B.
Reducing valves for steam service shall have self-contained control, dual diaphragms
with pilot, single seated, normally closed type. Valves, seats and springs: Stainless steel.
Diaphragms: Stainless Steel 300 Series. Valve bodies: Cast-Iron. All valves shall be
suitable for maximum operating conditions of 250-psig and 450ºF. Valves: Leslie Class
GPKP-1 or equal.
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2.05
CONDENSATE RECEIVER AND PUMP UNIT
A.
General: Provide as indicated, condensate receiver and pump unit, of capacity as
scheduled, consisting of cast-iron receiver, inlet strainer, 2 water pumps, and accessories
as specified herein. Factory-test complete unit and furnish certified test report including
NPSH characteristics.
B.
Receiver: Construct of close grained cast iron and equip with water level gage, dial
thermometer, pressure gage for each pump discharge, isolation valves between pump
suction and receiver, and 2 lifting eye bolts.
C.
Control Panel: Provide NEMA 2 control panel mounted on receiver, factory-wired, and
enclosing the following:
D.
1.
Combination magnetic starters for each pump, with 3 overload relays, circuit
breaker and cover interlock.
2.
2 selector switches.
3.
Momentary contact "test" push button for each pump.
4.
Circuit breaker for control circuit with cover interlock.
5.
Fusible control circuit transformer for each circuit when motor voltage exceeds
130v.
Manufacturers: Paco Pumps, Peerless Pump, or equal.
PART III - EXECUTION
3.01
INSTALLATION OF STEAM AND CONDENSATE PIPING
A.
B.
Steam Piping:
1
1.
Where possible, install piping with /16” per foot (½%) downward slope in direction
1
of steam flow. Otherwise, install with /32” per foot (¼%) downward slope.
2.
Install branch piping and riser offsets with ⅛” per foot (1%) downward slope in
direction of condensate return.
3.
Install eccentric reducer where pipe is reduced in size, with bottoms of both pipe
and reducer flush. Locate reducers 18” minimum distance from branch
connection.
Condensate Piping
1.
Install condensate piping to return steam condensate collection. Comply with
1
applicable steam piping installation requirements, except install piping with /32”
per foot (¼%) downward slope in direction of flow.
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3.02
FABRICATION AND INSTALLATION OF PIPING COMPONENTS
A.
3.1
FIELD QUALITY CONTROL:
A.
3.2
General: Fabricate and install piping components in accordance with applicable
requirements of Division 15 sections, ASME B31.9, and, where not otherwise indicated,
comply with recognized industry practices to ensure that components serve intended
function.
Test steam and condensate piping in accordance with testing requirements of Division 15
Basic Mechanical Materials and Methods sections.
ADJUSTING AND CLEANING:
A.
Clean, flush, and inspect steam and condensate piping systems in accordance with
requirements of Division 15, Section 15050 – Basic Mechanical Materials and Methods.
END OF SECTION 15520
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