Project Name
Project Number
UEPH Complex
Statement of Work
26 November 2001
4-16.2.3 Air space. Continuous 25 mm 1 inch 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. 230 degrees F. 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 (0.05 inch) minimum thickness
polyethylene shrink sleeve designed for a service temperature exceeding 80 degrees C (176
degrees F).
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
resin plastic (RTRP) piping manufactured by the filament winding process. The casing pipe
shall be wound to meet ASTM D 2310 classification RTRP and ASTM D 2996. The resin shall
be a polyester isothalic resin. The outer surface shall be coated with a pigmented, protected
resin containing a parafinated wax and ultraviolet inhibitors. Casing thickness shall be 5 mm
(0.185 inches) for 100 mm (4 inches) and below carrier pipe sizes and 6.5 mm (0.25 inches) for
carrier pipe sizes above 100 mm (4 inches). Condensate piping shall not be located in casings
which contain any other piping.
4-16.3.2 End seals. Each preinsulated section of piping shall completely seal the insulation,
providing a permanent water and vapor seal at each end. Preinsulated factory fabricated
sections of piping modified in the field shall be provided with an end seal which is equivalent to
the end seals furnished with the preinsulated section of piping.
4-16.3.3 Pipe coupling, steam. Coupling shall be of a multi-stage seal designed to
accommodate the expansion and contraction of the system in the coupling. Couplings shall be
of corrosion resistant materials. The annular seals and carrier pipe ends shall be specifically
designed to protect the seals and resist abrasion due to lateral loads in the system.
4-16.3.4 Pipe coupling, condensate. Coupling shall be a single stage seal design to
accommodate the expansion and contraction of the adjacent pipes. Coupling shall be of
corrosion resistant materials. The annular seals and carrier pipe ends shall be specifically
designed to protect the seals and resist abrasion due to lateral loads in the system.
4-16.4
Insulation. The minimum thickness of insulation for the heat distribution system shall
be in accordance with Tables 1 and 2.
Table 4.2 Minimum Pipe Insulation Thickness (mm)
For Steam (100 to 2.800 kPa (gage)) and High Temperature
Hot Water Supply and Return (120 to 230 degrees C)
INSULATIONS
INSULATIONS
For Drainable/Dryable Systems
For other Pre-Engineered Systems
Nominal
Paroc Epitherm Kaylo-10
Calcium
WSL
Pipe
Delta
Thermo-12
Silicate
Polyurethane
Diameter
Super
(mm)
Caltemp
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SOW-98
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