A cylinder containing less than 165 pounds (75 kg) of ammonia is not required to have a pressure relief device.
Pressure relief device equipment used on DOT containers must be inspected, repaired, or replaced according to applicable DOT regulations.
Minn. R. agency 105, ch. 1513, SYSTEMS USING DOT PORTABLE TANKS AND CYLINDERS, pt. 1513.0930
Statutory Authority: MS s 18C.121