Ask X3What does 49 CFR 178.320 (General requirements applicable to all DOT specification cargo tank motor vehicles) require?
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Based on 49 CFR 178.320, the provided regulation text sets forth definitions for terms applicable to all DOT specification cargo tank motor vehicles (such as appurtenance, cargo tank, MAWP, minimum thickness, and manufacturer).
To be specific and practical for a motor-carrier owner: if you act as a "manufacturer"—which includes attaching a cargo tank to a motor vehicle or to a motor vehicle suspension component that involves welding on the cargo tank wall—you must register with the Department in accordance with subpart F of part 107 in subpart A of 49 CFR. Additionally, for any material transported, your cargo tank's Maximum Allowable Working Pressure (MAWP) must, in use, be greater than or equal to the maximum lading pressure conditions prescribed in § 173.33.