all unlined cargo tanks · Thickness testing · cargo tanks measuring less than the sum of the minimum prescribed thickness, plus one-fifth of the original corrosion allowance
For all unlined cargo tanks, test or inspection is Thickness testing; condition or service qualifier is cargo tanks measuring less than the sum of the minimum prescribed thickness, plus one-fifth of the original corrosion allowance; interval is annually; regulation section is 49 CFR § 180.407, recorded from its source on 2026-08-10; source re-checked 2026-09-30.
- Container specification
- all unlined cargo tanks verified
- Test or inspection
- Thickness testing our reading
- Interval
- annually verified
- Condition or service qualifier
- cargo tanks measuring less than the sum of the minimum prescribed thickness, plus one-fifth of the original corrosion allowance verified
- Regulation section
- 49 CFR § 180.407
Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.
What the source says
The shell and head thickness of all unlined cargo tanks used for the transportation of materials corrosive to the tank must be measured at least once every 2 years, except that cargo tanks measuring less than the sum of the minimum prescribed thickness, plus one-fifth of the original corrosion allowance, must be tested annually.
— law.cornell.edu, retrieved 2026-08-10
Source
- law.cornell.eduhttps://www.law.cornell.edu/cfr/text/49/180.407