MIL-T-62357 Trailers, Tank: Potable Water And General Purpose, 500 Gallon, Two And Four-Wheel, Modified CommercialThis specification covers 500 gallon capacity, two-wheel and four-wheel wagon type tank trailers for hauling and dispensing liquids see 6.1 and 6.3. Vehicles procured under this specification are commercial items which are warranted by the manufacturer as specified in procurement documents.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28

MIL-T-62357A

conditions to those permitted by DOT Safety Regulation 178.346. Vents shall remain sealed When not fulfilling their purpose of equalizing internal and external pressures. The vents shall be easily removable for cleaning. Normal and emergency venting in accordance with DOT Safety Regulation 378.346, shall be provided on type II.

3.6.9 Mounting. The tank longitudinal subframe members shall be secured to the chassis frame longitudinals with U-bolts, twin studs, or by brackets, and shall include wood breaker strips.

3.6.9.1 U-bolts or twin studs. When U-bolts or twin studs are used, there shall be not less than four U-bolts or twin studs per side, each having 0.562 inch minimum body diameter with

0.625 inch minimum thread diameter. Tie-plates shall be at least 0.500 inch thick. Vehicle chassis frame shall be braced, using blocks of wood at each mounting point unless the mounting point is located at a full depth, frame crossmember. Blocks shall incorporate a keeper strap or groove for a mounting bolt, and shall be of a width to assure retention. Two tie-back straps shall be

provided, one on each side of the rear portion of body subframe, to maintain body alinement on the vehicle chassis

3.6.9.2 Brackets. When brackets are used, they shall be bolted to the web of the chassis frame rails. The body mounting brackets shall provide a means of drawing down the body on the chassis rails and provision shall be made to prevent lateral shifting of the breaker strips. Attachments shall not interfere with, nor obstruct, chassis components.

3.6.9.3 Breaker strips. A wood breaker strip 1 inch plus 0.063 inch, minus 0 inches finished thickness shall be installed between both of the tank longitudinal subframe members and the vehicle chassis frame. The width of each breaker strip shall be at least equal to the width of the corresponding trailer chassis frame rail.

3.7 Additional requirements for type I potable water trailer.

* 3.7.1 Piping. Discharge of the water shall be by gravity through a pipe outlet 3 inches in nominal diameter installed at the tank's lowest forward bottom section to assure maximum drainage of water. A union or flexible coupling for disconnecting the piping system from the tank outlet shall be installed as near the tank outlet as possible.

3.7.2 Main shutoff valve. A shutoff valve shall be installed in the main outlet line between the tank and a distribution manifold. The shutoff valve shall be of the quick-opening,

lever-operated or butterfly gate valve type, not less than 3 inches in nominal diameter.