MIL-S-62127A(AT)
3.8.2.2.1 Size. The bulkheads shall be of sufficient overall width and height to extend not less than 2 inches beyond the extreme cylinder outline as viewed from the end. Bulkhead thickness shall be sufficient to aline the cylinders in the proper longitudinal position and to insure against longitudinal movement of the cylinders when the semitrailer is subjected to the acceleration forces specified herein (see 3.3).
3.8.2.2.2 Installation. Bulkhead bottoms shall be secured to the chassis, and the tops shall be braced by compression or tension members so that longitudinal movement of the cylinders will not occur when the semitrailer is subjected to the maximum acceleration forces specified herein (see 3.3). Bulkheads shall be installed to be readily demountable for removal and replacement without the use of special tools and without breaking welds or seals.
3.8.3 Cylinder valves. The rear end of each cylinder shall be provided with a
diaphragm-type, oil-free, helium cylinder valve designed for service on cylinders with 2,400 psi
working pressure and conforming to MIL-V-2 except for the safety device.
* 3.8.4 Cylinder safety equipment. Both ends of each cylinder of the storage cylinder assembly shall be equipped with Type CG-5 (frangible disc) safety relief devices conforming to CGA Pamphlet S-1. The safety relief devices shall release the cylinder contents when the cylinder pressure exceeds 3,800 ⇦ 200 psi at ⇦ 71 degrees Celsius (C) and shall include a means of piping away any gas released, to a point above the highest tube in the trailer and away from personnel on the ground (see 3.9.4.10). The safety device at the rear end of each cylinder (rear end of the semitrailer) shall be constructed integral with the cylinder valve. The safety device at the front end of each cylinder shall be installed so that it will be protected against damage by impact.
3.8.4.1 Volume calibration. Each cylinder shall be marked with a serial number and calibrated for actual (water) volume in cubic inches at pressures of 1,000, 2,000, and 2,500 psi and at a temperature of 20°C plus or minus 5°C. Each cylinder shall be permanently and legibly stamped with the actual (water) volume at each of the specified pressures. The volume stamps shall be placed near the cylinder serial number where both will be simultaneously visible.
* 3.8.4.2 Temperature indicators. Cylinder(s) shall be equipped with an accurate, minimum-lag sensing element capable of measuring the average temperature of the gas
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