Change 2, 30 December 1991
NFGS-02696, Exterior Piping Insulation. NFGS-02696 covers field-
applied exterior piping insulation, insulation requirements for exterior steam
piping, exterior condensate piping including aboveground piping, piping on
piers, piping under piers, piping in trenches on piers, piping in tunnels, and
piping in manholes.
NFGS-02697, Exterior Buried Pumped Condensate Return System. NFGS-
02697 covers the requirements for exterior buried factory-prefabricated
preinsulated pumped condensate (hot water) return piping systems suitable for
installation in Class A, B, C, and D ground water conditions, including piping
in manholes, plastic piping systems for which a Federal Agency Approved
Brochure has been issued, and related work. Use the plastic carrier piping
only for sizes 2, 3, 4, 5, 6, 8, and 10 inches. Thus, the connecting system
piping should be of equal size or increased to the next size of the plastic
carrier piping. NFGS-02697 also covers Contractor's responsibilities which
include the following:
b) provide exterior buried factory-prefabricated preinsulated pumped
condensate (hot water), and
c) provide plastic piping systems for Class A or Class B ground water
conditions including concrete pipe anchors exterior of manholes, interface
with each manhole, and the watershed to aboveground piping.
Show the design for the aboveground piping, the manholes, the piping
within manholes, and the piping not in approved prefabricated conduit or pre-
direct 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 piping anchors exterior of
manholes, interface with each manhole, and the watershed to aboveground
NFGS-02698, Exterior Buried Preinsulated Water Piping. NFGS-02698
covers the requirements for exterior buried factory-prefabricated preinsulated
domestic water piping, including hot domestic water piping, recirculating hot
domestic water piping, chilled water piping, chill-hot (dual-temperature)
water piping, and hot water piping. Show the design for the entire piping
Exterior Compressed Air Piping System. Use NFGS-02682, Exterior Fuel
Distribution System, for the requirements of furnishing and installing
exterior compressed air piping.
Loads and Distribution System Locations.
For approximate conditions,
refer to Table 1.