Rule 409. In addition to the requirements set forth in 49 C.F.R.§ 192.241(b), which is adopted by reference in R 460.20606, an operator of pipeline facilities used in the transportation of sour gas shall engage in nondestructive testing of 100% of all girth butt welds. Nondestructive testing of welds shall be performed by any process that clearly indicates all defects in the welds.
Mich. Admin. Code R. 460.20409