MIL-S-62127 Semitrailer, Compressed Gas Cylinder: Helium, CommercialThis specification covers a commercial semitrailer for storing, transporting, and charging compressed helium gas. The tandem axle semitrailer mounts 38 cylinders having a combined water capacity of not less than 340 cubic feet and a design working pressure of at least 2400 pounds per square inch gage psig. Semitrailer procured under this specification are commercial items which shall be warranted as specified in the procurement documents.

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MIL-S-62127A(AT)

* 3.6.4.2 Inner tubes. When tube type tires are furnished, inner tubes shall be of heavy duty type, and shall be of proper size for the tires furnished. Tire flaps shall be provided in accordance with Tire and Rim Association recommendations.

* 3.6.4.3 Carrier. A carrier for a spare wheel or rim and a tire shall be installed in a readily accessible location. Means shall be provided for securing the tire to the carrier to prevent accidental loss.

* 3.6.4.4 Spare wheel. When specified (see 6.2), a spare wheel or rim shall be mounted on the tire carrier.

* 3.6.4.5 Spare tire assembly. When specified (see 6.2), a spare tire assembly shall be furnished. The spare tire assembly shall include an inflated spare tire mounted on the spare wheel or rim. The spare tire shall be of the same size, load range and tread design as the tires installed on the semitrailer.

3.6.5 Brakes.

* 3.6.5.1 Brakes. The brakes shall be of the full air internal expanding type and shall conform to Federal Motor Carrier Safety Regulations 393.40 through 393.43, 393.45, 393.46, and 393.47. The brake system shall include piping, hose connections, gladhands, spring loaded dust covers or dummy gladhands equipped with security chains, air reservoirs with remote control drain, automatic slack adjusters, brake chambers, relay emergency valve, and all other parts and connections required for a complete air brake system. Gladhands shall conform to SAE J318. The location of the gladhands shall be as recommended in SAE J702. All components of the brake system shall be installed in such a manner as to provide adequate road clearance when traveling over uneven or rough terrain, including objects liable to strike and

cause damage to the brake system components. Slack adjusters and air chambers shall be located

above the bottom edge of the axle carrier. No part of the brake system shall extend below the bottom of wheel rims to insure, in case of a flat tire, that the weight of the semitrailer will be supported by the rim and the flat tire and will not be imposed on any component of the braking system.

* 3.6.5.2 Parking brakes. Spring or air diaphragm mechanical lock type parking brakes shall be provided. The parking brakes shall be automatically applied upon disconnection of the emergency air line and under emergency braking conditions. The parking brakes shall remain in