Rule 408. In addition to the requirements 49 CFR 192.225, which is adopted by reference in R 460.20606, an operator of pipeline facilities used in the transportation of sour gas shall use welding procedures that conform to the welding provisions of the National Association of Corrosion Engineers international standard NACE MR0175/ISO 15156, which is adopted by reference in R 460.20605.
Mich. Admin. Code R. 460.20408