MIL-S-62183 Semitrailers, Tank: Waste And Sludge Acid, 3,000 To 5,000 Gallon, Modified CommercialThis specification covers two types and three sizes of modified commercial tank semitrailers for collecting, transporting and discharging waste, sludge acids and corrosive liquids weighing up to 13 pounds per gallon. Tank semitrailers procured for this specification are commercial items which are warranted by the manufacturer as specified in acquisition documents.

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MIL-S-62183C

TABLE I. Dimensions and clearances.

Feature

Inches

Overall length for size A and B, minimum practicable, but not more than (inches)

Overall length for size C, minimum practicable, but not more than (inches)

Overall width not more than (inches)

Overall height for size A and B, not more than (inches)

Overall height for size C, not more than (inches)

Height of upper fifth wheel plate, plus or minus one inch (inches)

Landing gear clearance, radius from center of kingpin to any point 6 inches below upper fifth wheel plate, not less than (inches)

Ground clearance, not less than (inches)

Swing radius from centerline of kingpin to most distant point on the

semitrailer nose, not more than (inches)

480

510

132

150

3.5 Frame or frameless type. Chassis construction shall be the manufacturer's standard frame or frameless type, but in either case, the structural integrity requirements of DoT Safety Regulation 178.345 shall be met. Structural members shall support the running gear, upper fifth wheel plate and landing gear.

* 3.5.1 Frame. When a frame type semitrailer is furnished, the frame shall be capable of meeting the performance requirements specified herein. The frame shall be adequately braced to ensure stability. When the vehicle is loaded with specified payload (see 3.2.3), and when being towed by a truck tractor, the maximum fiber stress in any frame member shall not be greater than

33 percent of the frame material yield strength. Crossmembers shall be of full width. Bolsters shall be of sufficient width to support the tank and to distribute the stress when the tank is loaded with specified payload. All parts of the frame shall be completely electric arc welded.

3.5.2 Frame splices. Where frame members are spliced, joints shall be reinforced to fulfill the dynamic loading requirements and the static loading requirements. Splices shall be designed to avoid stress concentration. Splice welds shall be continuous.

* 3.5.3 Stress analysis. A stress analysis for the semitrailer, loaded as specified in 3.4, shall be performed. The stress analysis shall include shear and moment diagrams and deflection calculations. This analysis shall verify compliance of the chassis and tank structural integrity with Safety Regulation 178.345.3 and shall at least the following calculations and diagrams: