MIL-HDBK-1003/8A
Change 2, 30 December 1991
2.2.1
NFGS-02685, Exterior Buried Natural Gas Distribution Systems. NFGS-
02685 covers these requirements for maximum system working pressures of 60
psig at 100 degrees F for exterior distribution systems for natural gas.
Project drawings shall indicate the design for the entire piping system.
2.2.2
NFGS-02693, Exterior Shallow Trench Heat Distribution System. NFGS-
02693 covers the requirements for exterior shallow trench heat distribution
systems, including concrete trench, manholes, piping, pipe anchors, pipe
supports, interface with each manhole and watershed to aboveground piping.
The specification covers system components for working pressure of 150 psig
(1034 kiloPascal (kPa)) steam at 366 degrees F (185 degrees C) and 125 psig
(862 kPa) condensate at 250 degrees F (121 degrees C) or hot water at 450
degrees F (232 degrees C). Show the design for the entire piping systems and
shallow concrete trench systems on the project drawings.
2.2.3
NFGS-02694, Exterior Underground Heat Distribution Systems. NFGS-
02694 (formerly NFGS-15705) covers the requirements for Contractor designing
and providing exterior buried factory-prefabricated preinsulated or pre-
engineered preinsulated steam and condensate piping systems and hot water
piping systems for Class A, B, C, and D ground water conditions including
concrete pipe anchors exterior of manholes, interface with each manhole, and
the watershed to aboveground piping. The specification covers system
components for working pressure of 150 psig (1034 kPa) steam at 366 degrees F
(185 degrees C) and 125 psig (862 kPa) condensate at 250 degrees F (121
degrees C) or hot water at 450 degrees F (232 degrees C). Show the design for
the aboveground piping, the manholes, the piping within manholes, and the
piping not in approved conduit systems on the drawings. The Contractor
designs and provides buried factory-prefabricated preinsulated piping in a
conduit or pre-engineered insulated piping system for which a Federal Agency
Approved Brochure has been issued including concrete pipe anchors exterior of
manholes, interface with each manhole and building, and the watershed to
aboveground piping.
2.2.4
NFGS-02695, Exterior Aboveground Steam Distribution System. NFGS-
02695 covers the requirements for exterior aboveground steam and condensate
(hot water) piping systems: exposed to the weather exterior of buildings and
supported on pedestals or poles; on piers, under piers, and in trenches on
piers; and in tunnels, in manholes, and related work. The work also includes
providing buried factory-prefabricated preinsulated steam and condensate
piping under roads. The specification covers system components for working
pressure of 150 psig (1034 kPa) steam at 366 degrees F (185 degrees C) and 125
psig (862 kPa) condensate at 250 degrees F (121 degrees C). Show the design
for the aboveground piping, and the piping under roads on project drawings.
The design includes manholes, the piping within manholes, (buried factory-
prefabricated preinsulated piping in a conduit or pre-engineered insulated
piping under roads for which a Federal Agency Approved Brochure has been
issued), concrete pipe anchors, interface with each manhole, and the watershed
to aboveground piping.
3
Previous Page
