MIL-PRF-38170H
3.3 Materials. All materials shall be suitably treated to resist corrosion due to electrolytic
decomposition and any other atmospheric conditions that may be encountered during operational
use or storage. The use of toxic chemicals, hazardous substances, or ODCs shall be avoided,
whenever feasible (see 4.5.1).
3.4 Interface. The following shall be interfaced with the storage tanks:
a. Liquid servicing hose (see 3.5.8.)
b. Hoisting and tiedown attachments (see 3.5.12.7.)
3.5 Design.
3.5.1 Tank assembly. The tank assembly shall be a self-contained liquid oxygen transport,
storage, and servicing unit consisting of a tow-wheeled trailer, a storage tank, a control housing
assembly, piping and connections, and safety devices, including necessary controls and
accessories. The tank assembly shall be capable of:
a. Being filled with liquid oxygen at a supply location (see 4.5.1).
b. Being transported while filled with liquid oxygen and pressurized to 50 pounds per square
inch gage (psig) (see 4.5.1).
c. Transporting the liquid oxygen about an airbase (see 4.5.1).
d. Storing the liquid with minimum evaporation loss until needed to service the aircraft
converters (see 4.5.1).
3.5.2 Storage tank. The storage tank unit shall consist of inner and outer shells, piping and
connections, controls, and safety devices. The storage tank shall be interchangeable, and shall be
removable, using common hand tools, from the control housing and chassis frame (see 4.5.1).
3.5.3 Pressure vessels. The liquid storage tank assembly, piping, and connections thereto shall
meet the requirements of section VIII of the ASME Boiler and Pressure Vessel Code. Also, the
inner shell shall be certified under the code for the specified working pressure (see 4.5.1, 4.5.2,
6.2).
3.5.4 Inner shell.
3.5.4.1 Design pressure. The inner shell shall have a maximum working pressure the same as
the inner shell pressure relief device (see 3.5.4.2). The normal working pressure shall be not less
than 50 psig for transferring and servicing liquid oxygen under the conditions specified herein.
The inner shell shall withstand an absolute pressure of 100 microns of mercury (Hg) or less with
the annular space at atmospheric pressure. The shell shall not sustain damage when the annular
space is evacuated to a high vacuum or is pressurized to the outer shell pressure relief device
maximum opening pressure (see 4.5.1, 4.5.2).
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