Neglecting Cargo Tank Inspections Can Lead to Disaster
Regular inspections of specification cargo tanks are critical for maintaining safety on our highways. These inspections help identify any mechanical issues, leaks, or other potential hazards that could compromise the integrity of the cargo tank. Imagine a cargo tank with a hidden defect—neglecting inspections can lead to catastrophic consequences, such as a hazmat spill or an accident.
Not only can inspections prevent tragedies, but they are also required to stay in compliance with the hazmat regulations.
Tests and inspections
The type and frequency of inspection depends on several factors, such as the type of cargo tank you have, when the last inspection was completed, and the type of material you are transporting. There are also instances when your cargo tank may need to be inspected prior to its periodic inspection test date, such as when it has:
- Dents, cuts, gouges, corroded areas, or signs of leakage,
- Damage that may affect lading retention capability, or
- Been out of hazmat transportation service for a year or more.
External Visual Inspection - Assess the overall condition of the cargo tank from the outside.
- Frequency:
- Vacuum loaded cargo tanks with full opening rear heads - 6 months
- All other cargo tanks - Annually
Internal Visual Inspection - Assess the interior condition of the cargo tank.
- Frequency:
- Insulated cargo tanks, except MC 330, MC 331, MC 338 – Annually
- Cargo tanks transporting lading corrosive to the tank – Annually
- MC 331 cargo tanks less than 3,500 gallons capacity in dedicated propane service constructed of nonquenched and tempered NQT SA-612 steel – 10 years
- All other cargo tanks, except MC 338 – 5 years
Lining Inspection - Assess the lining condition of the cargo tank.
- Frequency:
- Lined cargo tanks transporting lading corrosive to the tank - Annually
Leakage Test - Check for any leaks in the cargo tank.
- Frequency:
- MC 330 and MC 331 cargo tanks in chlorine service – 2 years
- All other cargo tanks except MC 338 - Annually
Pressure Test - Verify the tank’s structural integrity under pressure.
- Frequency:
- Insulated cargo tanks with no manhole, except MC 338 - Annually
- Vacuum loaded cargo tanks with full opening rear heads – 2 years
- MC 330 and MC 331 cargo tanks in chlorine service – 2 years
- MC 331 cargo tanks less than 3,500 gallons capacity in dedicated propane service constructed of nonquenched and tempered NQT SA-612 steel – 10 years
- All other cargo tanks – 5 years
Thickness Test - Measure the thickness of the tank’s shell and heads.
- Frequency:
- Unlined cargo tanks transporting material corrosive to the tank, except MC 338 – 2 years
Need additional information on cargo tank inspections? Check out this ezExplanation.
Inspection markings
Cargo tanks that pass the inspection must be marked with the date (month and year) and the type of test or inspection performed. The type of test or inspection can be abbreviated as follows:
- V - external visual inspection and test,
- I - internal visual inspection,
- P - pressure test,
- L - lining inspection,
- T - thickness test,
- K - leakage test, and
- K-EPA27 - leakage test.
Key to Remember: Compliance with these tests and inspections is crucial for maintaining the safety of hazardous materials transportation. Cargo tanks that pass these requirements contribute to safer roads and protect both people and the environment.