MIL-HDBK 1028/6A
(ASME), Boiler and Pressure Vessel Code, Section VIII, Unfired Pressure
Vessels. Coat tank interiors with corrosion-resistant, chemically inert
material. Provide tanks with drain valve, automatic condensate trap, safety
valve, air inlet and outlet connections, flanged manhole, and support
saddles. Tanks shall be installed adjacent to the central facilities
building and provided with concrete pads and fabricated steel support
saddles.
3.2.3
Miscellaneous Equipment and Piping. Miscellaneous equipment and
piping shall be furnished, installed, tested, and operated successfully.
Piping systems and components shall conform to American National Standards
Institute (ANSI) B31.1, Power Piping. 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. The piping system shall include the following:
3.2.3.1
Distribution System Pressure Control Valve. The pressure control
valve shall reduce and maintain a constant system pressure of 125 psig
(47.53 kPa).
3.2.3.2
Pressure Relief Valve. Pressure relief valve shall protect
distribution system components from overpressure in excess of 140 psig
(965.16 kPa).
3.2.3.3
Piping. Pipe shall be American Society for Testing and Materials
(ASTM) A53, Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded, and
Seamless, Grade B, carbon steel seamless Schedule 40 for sizes 2-1/2 in.
(63.5 mm) and larger; Schedule 80 for sizes 2 in.
(50.8 mm) and smaller. Refer to ASTM A53.
3.2.3.4
Miscellaneous Equipment. Miscellaneous equipment at aircraft
service points are itemized in Section 6.
3.2.4
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 125 psig (861.75 kPa) gauge at 60 degrees F (15.5 degrees
C). Pipe shall be of carbon steel welded construction with polyethylene
coating, and shall be direct buried. Distribution header shall be run from
central facilities to apron loop and connect isolated feeder lines to serve
service islands. Slope compressed air distribution piping system to drain
at low points, provide drains, and a means to solvent flush the system to
allow cleanup after fuel or lube oil spills into system.
3.3
Environmental Control Cooling Air System. The design of the
environmental control cooling air system shall comply with the requirements
of MIL-HDBK-1003/3, Heating, Ventilating, Air Conditioning,
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