A commercial Motor Vehicle that weigh more than 10,000 pounds must undergo annual DOT inspections. A DOT inspection is an inspection conducted by the Department of Transportation to ensure that all the CMV parts and accessories are safe to use, in good condition and working properly. More specifically a Cargo Tanker requires the following tests:
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Test or inspection (cargo tank specification, configuration, and service)
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Interval period after first test
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External Visual Inspection:
All cargo tanks designed to be loaded by vacuum with full opening rear heads.
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6 Months
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All other cargo tanks.
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1 Year
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Internal Visual Inspection:
All insulated cargo tanks, except MC 330, MC 331, MC 338 (see Note 4).
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1 Year
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All cargo tanks transporting lading corrosive to the tank
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1 Year
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All other cargo tanks, except MC 338
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5 Years
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Lining Inspection:
All lined cargo tanks transporting lading corrosive to the tank
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1 Year
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Leakage Test:
MC 330 and MC 331 cargo tanks in chlorine service
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2 Years
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All other cargo tanks except MC 338
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1 Year
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Pressure Test:(Hydrostatic or pneumatic) (See Notes 2 and 3)
All cargo tanks which are insulated with no manhole or insulated and lined, except MC 338.
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1 Year
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All cargo tanks designed to be loaded by vacuum with full opening rear heads.
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2 Years
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MC 330 and MC 331 cargo tanks in chlorine service
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2 Years
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All other cargo tanks
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5 Years
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Thickness Test:
All unlined cargo tanks transporting material corrosive to the tank, except MC 338.
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2 Years
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NOTE 1: If a cargo tank is subject to an applicable inspection or test requirement under the regulations in effect on December 30, 1990, and the due date (as specified by a requirement in effect on December 30, 1990) for completing the required inspection or test occurs before the compliance date listed in table I, the earlier date applies. NOTE 2: Pressure testing is not required for MC 330 and MC 331 cargo tanks in dedicated sodium metal service. NOTE 3: Pressure testing is not required for uninsulated lined cargo tanks, with a design pressure or MAWP 15 psig or less, which receive an external visual inspection and lining inspection at least once each year. NOTE 4: Insulated cargo tanks equipped with manholes or inspection openings may perform either an internal visual inspection in conjunction with the external visual inspection or a hydrostatic or pneumatic pressure-test of the cargo tank.
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