Project Name
Project Number
UEPH Complex
Statement of Work
26 November 2001
8 and smaller
70
10
80
12
105
14
115
16 to 18
120
20
125
24
155
4-15.3
End seals. Each preinsulated section of piping shall have a complete sealing of the
insulation to provide a permanent water and vapor seal at each end of the preinsulated section
of piping. Preinsulated 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. End seals
must be tested and certified in accordance with manufacturer's recommendations.
4-15.4
Insulation.
4-15.4.1 Factory applied insulation. Prefabricated pipe and fittings shall be insulated in the
factory. Foam insulation for prefabricated insulated pipe and fittings shall be polyurethane foam
meeting the requirements of ASTM C 591 having a density not less than 32 kg per cubic meter
(2 pounds per cubic foot). The polyurethane foam shall completely fill the annular space
between the carrier pipe and the casing. Insulation thickness shall be a minimum of [20]
[_____] mm ([0.9] [_____] inches). The insulation thermal conductivity factor shall not exceed
the numerical value of 0.02 W/mK at 24 degrees C (0.15 Btu-inch/square foot-degree F-hour at
75 degrees F), when tested in accordance with ASTM C 518. Manufacturer shall certify that the
insulated pipe is free of insulation voids.
4-15.4.2 Field applied insulation. Field applied insulation for fittings, and field casing closures,
if required, and other piping system accessories shall be polyurethane matching the pipe
insulation. Thickness shall match adjacent piping insulation thickness. Buried fittings and
accessories shall have field applied polyurethane insulation to match adjacent piping and shall
be protected with a covering matching the pipe casing. Shrink sleeves with a minimum
thickness of 1.3 mm 50 mils shall be provided over casing connection joints.
4-15.5
Thrust blocks. Thrust blocks shall be installed at the locations shown or
recommended by the pipe system manufacturer. No pipe joint shall be embedded in concrete
unless the assembly has previously been hydrostatically tested. The thrust blocks shall provide
for transfer of thrusts and reactions without exceeding the allowable stress of the concrete and
shall be installed in accordance with pipe manufacturer's instructions. In muck or peat, all
thrusts shall be resisted by piles or tie rods to solid foundations or by removal of peat or muck
which shall be replaced with ballast of sufficient stability to resist thrusts.
4-15.6
Expansion loops. Expansion loops and expansion bends (Z- and L- type) shall be
factory fabricated of casing, insulation, and carrier piping identical to that furnished for straight
runs. Expansion loops and bends shall be properly designed in accordance with the allowable
stress limits indicated in ASME B31.1 for the type of pipe used. Expansion loops and bends
shall be shipped to the jobsite in the maximum size sections feasible to minimize the number of
field joints. The expansion loops and bends casing and insulation where applicable, shall be
suitably sized to accommodate pipe movement. Field joints shall be made in straight runs of the
expansion loops and bends, and the number shall be kept to a minimum.
4-15.7
Manholes and anchors. Manholes shall be designed and installed as recommended
by the system manufacturer. Anchor design shall be in accordance with the published data of
the manufacturer and for prefabricated systems shall be factory fabricated by the prefabricated
system manufacturer. In all cases, the design shall be such that water penetration,
SOW-96
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