Project Name
Project Number
TEMF
Statement of Work
UFC 4-214-02, 24 Jul 03
paragraphs.] Distribution system shall be installed to supply steam to [and return condensate
from] mechanical equipment rooms. A complete underground [heat distribution] [and]
[condensate return] system including all required components such as carrier pipes, [steam
pipe,] [high temperature hot water supply pipe,] [condensate return pipe,] [high temperature hot
water return pipe,] and fittings, anchors, pipe supports, insulation, protective casing, and
cathodic protection, for the system supplied. Gland type end seals will not be permitted.
Drainable-Dryable-Testable (DDT) systems with fiberglass casings shall not be permitted.
4-16.1
Piping materials.
4-16.1.1 Steam and High Temperature Hot Water Pipe. Pipe material shall be steel; seamless
ASTM A 53, Grade B or ASTM A 106, Grade B; or electric resistance welded ASTM A 53,
Grade B; Schedule 40. Standard weight will be permitted for pipe sizes 300 mm and above.
ASTM A 53, Type F furnace butt welded pipe will not be allowed. Joints will not be allowed in
the factory fabricated straight section of the carrier pipe. Factory fabricated piping sections, as
part of an expansion loop or bend, shall have all welded joints 100% radiographically inspected
in accordance with ASME B31.1.
4-16.1.2 Condensate pipe. Pipe shall be steel; seamless ASTM A 53, Grade B or ASTM A
106, Grade B, schedule 80; electric resistance welded ASTM A 53, Grade B; Schedule 80.
ASTM A 53, Type F furnace butt welded pipe will not be allowed. Joints will not be allowed in
the factory fabricated section of the carrier pipe. Factory fabricated piping sections, as part of
an expansion loop or bend shall have all welded joints 100% radiographically inspected in
accordance with ASME B31.1.
4-16.2
Factory fabricated, direct-buried DDT systems.
4-16.2.1 Casing. Casing shall be smooth-wall steel, electric resistance spiral welded,
conforming to ASTM A 134, ASTM A 135, or ASTM A 139. Minimum casing thickness shall be
6.35 mm. Eccentric connectors shall be provided between casing sections as needed to
provide drainage of casing section between manholes and between manholes and buildings.
4-16.2.2 Casing End Plates, Vents, and Drains. End plates shall be made of ASTM A 36/A
36M steel, minimum thickness 13 mm for conduit pipe sizes above 300 mm and 9.5 mm for
conduit pipe sizes 300 mm and less. A 25 mm ASTM A 53, Sch 40, galvanized vent riser pipe
shall be provided on end plate vent opening. Vent pipe shall extend to top of manhole and
terminate 300 mm above grade with a 180 degree bend. A 25 mm drain shall be provided at
the bottom and vent at the top. Brass plugs and half coupling, constructed with welded steel
and welded to the end plate, shall be furnished; drains shall be plugged; vents shall not be
plugged.
4-16.2.3 Air space. Continuous 25 mm minimum air space shall be provided between carrier
pipe insulation and casing.
4-16.2.4 Casing coating. Coating shall be rated by manufacturer for continuous service for at
least 25 years at temperatures of 110 degrees C. Coating shall be applied in accordance with
the coating manufacturer's instructions, shall be factory inspected for holidays and repaired as
necessary.
4-16.2.5 Field connections. Field connection of casing sections shall be made using a
compatible steel section, welded to casing sections, coated on all surfaces with manufacturer's
coating field repair compound, and covered with a 1.3 mm minimum thickness polyethylene
shrink sleeve designed for a service temperature exceeding 80 degrees C.
4-16.3
Factory fabricated, direct-buried water spread limiting (WSL) systems.
4-16.3.1
Casing for Steam and Condensate. The casing shall be reinforced thermosetting
SOW-57
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