MIL-HDBK 1028/6A
Provide a closed-circuit type cooling water assembly with continuous
cooling water recirculation and horizontal air-cooled radiator type heat
exchanger. Also provide propeller forced draft fans; a National Electrical
Manufacturers Association (NEMA) Type 12 control cabinet housing electrical
controls; motor starters; transformers and relays; and interconnecting
piping mounted on a common steel base. As an option, the cooling water
assembly shall include a circulating pump completely piped and wired to an
integral control cabinet.
3.3.1.9
Circulating Pumps. Furnish and install circulating pumps of the
end-suction centrifugal type:
a)
Inside the central facilities building or
b)
As an integral component of the radiator type cooling water
assembly.
3.3.1.10 Controls. Provide compressors and a compressed air system with a
completely factory-assembled control system. The control system shall
provide automatic capacity control (load sequencing) and safety controls
for warning and equipment protection. Also provide and install a
freestanding cabinet type control panel near the compressors.
3.3.2
Miscellaneous Equipment and Piping. Furnish, install, test, and
successfully operate miscellaneous equipment and piping. Piping systems
and components shall conform to ANSI B31.1. Pipe, fittings, valves, and
accessories shall be of the proper type for pressure and temperature of
each piping system. Joints for ferrous piping shall be flanged, screwed, or
welded. Provide isolation valves and piping required to remove any major
component for servicing during system operation. The piping system shall
meet the following criteria:
a) Pipe shall conform to ASTM A53, Grade B, seamless carbon
steel Schedule 40 for sizes 2-1/2 in. (63.5 mm) and larger, Schedule 80 for
sizes 2 in. (51 mm) and smaller.
b) Provide miscellaneous equipment at aircraft service points as
itemized in Section 6.
3.3.3
Distribution System. Compressed air shall be distributed to
hangar and parking apron in underground lines, with cathodic protection, in
common trench with electrical duct bank. Compressed air distribution
pressure shall be 100 psig (689.4 kPa) gauge at 60 degrees F (16 degrees
C). Pipe shall be of carbon steel welded construction with polyethylene
coating and shall be direct buried. Run distribution header from central
facilities to apron loop and connect isolated feeder lines to serve service
islands.
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