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|  MIL-S-62127A(AT)
contained in the cylinder. All cylinder(s) temperature sensing elements shall be wired to a single
temperature indicator through a selector switch designed to connect the indicator to any selected
individual sensing element.
3.8.4.2.1 Mounting. The temperature indicator and selector switch shall be securely
mounted in the control cabinet adjacent to the manifold pressure gages specified in 3.9.4.3. They
shall be readily visible and accessible to an operator standing on the ground at the rear of the
semitrailer. The mounting shall be such as to protect the units against damage during service and
road transport, and to permit removing the units without disturbing components not associated
with the temperature-measuring apparatus.
*
3.8.5 Cylinders. The vehicle shall be equipped with 38 cylinders which have a total
water capacity of not less than 340 cubic feet. The nominal water capacity of each cylinder shall
be at least 15,460 cubic inches. The unit, including all operating equipment, shall conform to
Title 49, Code of Federal Regulation 173.300, 173.302, 173.306, 173.314 and the applicable
portions of Section 178 requirements specified herein. The cylinders shall conform to United
States Department of Transportation specification 3AA-2400. The cylinders and all associated
equipment shall be constructed to withstand 2,400 psig working pressure, and all cylinders and
connections thereto shall be designed and fabricated in accordance with Title 49, Code of
Federal Regulations, Parts 1 through 199, and ASME Boiler and Pressure Vessel Code Section
VIII, and shall be stamped with the Code 4-symbol.
3.8.5.1 Pressure relief devices. Wherever needed, pressure relief devices conforming to
Compressed Gas Association (CGA) Pamphlet 8-1 shall be provided to protect against excessive
pressure in any component. Provisions shall be incorporated to permit discharge of pressure
without danger to operating or maintenance personnel.
*
3.8.5.2 Storage capacity. The semitrailer shall have a total actual (water volume) gas
storage cylinder capacity of not less than 52,000 cubic feet at 2,400 psig.
3.8.5.3 Working pressure. The semitrailer gas storage cylinders and all other
gas-handling components shall be capable of containing the gas without leakage at a working
pressure of 2,400 psi and at any temperature between minus 62C and plus 71C.
3.8.5.4 Storage cylinder assembly. The storage cylinder assembly shall consist of
38 cylinders constructed in accordance with Department of Transportation Specification
3AA-2400 for a working pressure of not less than 2,400 psi under the temperature and use
conditions
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