Inspection Intervals

for DOT/MC Specification Tanks

V-External Visual Inspection
All cargo Tanks designed to be loaded by vacuum with full opening rear heads.	6 months
All other cargo tanks.	1 year
I-Internal Visual Inspection
All insulated cargo tanks, except MC330, MC331, MC338	1 year
All cargo tanks transporting lading corrosive to tank.	1 year
All other cargo tanks, except MC338.	5 years
L-Lining Inspection
All lined cargo tanks transporting lading corrosive to tank.	1 year
K-Leakage Test
MC330 and MC331 cargo tanks in chlorine service.	2 years
All other cargo tanks, except MC338.	1 year
P-Pressure Test
All cargo tanks which are insulated with no manhole, or insulated and lined, except MC338.	1 year
All cargo tanks designed to be loaded by vacuum with full opening rear heads.	2 years
MC330 and MC331 cargo tanks in chlorine service.	2 years
All other cargo tanks.	5 years
T-Thickness Test
All unlined cargo tanks transporting material corrosive to the tank, except MC338.	2 years
UC-Upper Coupler Inspection
All cargo tanks transporting material corrosive to the tank.	2 years
All other cargo tanks.	5 years

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