scope:

This standard represents the minimum requirements for pressure relief devices considered to be appropriate and adequate for use on cylinders having capacities of 1000 lb (454 kg) of water or less. Refer also to Title 49 of the U.S. Code of Federal Regulations (49 CFR) 173.301(f) [1].¹ This standard also applies to DOT-3AX, DOT-3AAX, and DOT-3T cylinders having capacities over 1000 lb (454 kg) of water, and which comply with the design specifications and charging and maintenance regulations of the U.S. Department of Transportation (DOT) or the corresponding specifications and regulations of Transport Canada (TC) [1, 2]. This standard also covers requirements for pressure relief devices for CTC/DOT-4L and TC-4LM insulated cylinders containing cryogenic liquids.

¹ References are shown by bracketed numbers and are listed in order of appearance in the reference section.