The maximum allowable working pressure on a watertube boiler, the tubes of which are secured to a cast iron or malleable iron header, or which have cast iron mud drums, may not exceed one hundred sixty pounds per square inch gauge [1103.17 kilopascals].

History: Effective July 1, 2020

General Authority: NDCC 23.1-16-07

Law Implemented: NDCC 23.1-16-07