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Tank Trailer Inspections

The tests and inspections required for tank trailers are: external visual inspection (V), internal visual inspection (I), lining test (L), pressure retest (P), leakage test (K), and thickness test (T). Requirements for these six tests and inspections can be found in 49 CFR 180.407( §180.407. 

Prior to any test or inspection, the cargo tank should be professionally cleaned. Cleaning has safety and practical implications. A clean tank will ensure that inspectors are not exposed to any dangerous materials. It is important prior to starting the tests to double check to make sure to purge all liquid and vapor lines and any void areas on the cargo tank. Additionally, a clean tank ensures that no defects in the tank are overlooked because they were obscured by residue, dirt, or debris.

Each specification cargo tank must be tested and inspected by an inspector meeting the qualifications in 49 CFR 180.407. 

Test or inspection


Interval period after first test


External Visual Inspection (V):

 

All cargo tanks designed to be loaded by vacuum with full opening rear heads

6 months.

All other cargo tanks


1 year.


Internal Visual Inspection (I):

 

All insulated cargo tanks, except MC 330, MC 331, MC 338

1

All cargo tanks transporting lading corrosive to the tank

1

MC 331 cargo tanks less than 3,500 gallons water capacity in dedicated propane service constructed of non-quenched and tempered NQT SA-612 steel

10

All other cargo tanks, except MC 338


5


Lining Inspection (L):

 

All lined cargo tanks transporting lading corrosive to the tank


1 year.


Leakage Test (K):

 

MC 330 and MC 331 cargo tanks in chlorine service

2 years.

All other cargo tanks except MC 338


1 year.


Pressure Test (P):

 

All cargo tanks which are insulated with no manhole or insulated and lined, except MC 338

1

All cargo tanks designed to be loaded by vacuum with full opening rear heads

2

MC 330 and MC 331 cargo tanks in chlorine service

2

MC 331 cargo tanks less than 3,500 gallons water capacity in dedicated propane service constructed of nonquenched and tempered NQT steel

10

All other cargo tanks


5


Thickness Test (T):

 

All unlined cargo tanks transporting material corrosive to the tank, except MC 338

2 years.

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Trailer Services of West Texas has your parts needs covered. We have a vast parts inventory, a knowledgeable sales staff and competitive pricing. We offer ordering via email. Just email us at: BSlaten@amarillothermoking.com or complete the form above and tell us how we can help you. We accept Visa, MasterCard, Discover and American Express, and you can apply for a credit account. Contact us to learn more.  We guarantee shipping same day on all in-stock items on orders placed by 3:00 p.m., CST during regular business days. We are open from 8:00 a.m. to 5:00 p.m. CST.  You can also call our parts teams:

Amarillo (806) 376-5837
Lubbock (806) 763-6311
Odessa (806) 561-9792