Section R. 408.11241 - Piping materialRule 1241.
(1) Piping for acetylene shall be limited to steel and ductile iron.(2) Piping for other gases shall be compatible with the gas.(3) Oxygen at pressures of more than 700 psig shall be run in stainless steel or copper alloy piping.(4) Gray or white cast iron fittings shall not be used.(5) Pipe and fittings shall be as prescribed in section 2 of the ANSI B31.1 "Industrial Gas and Air Piping Systems," 1967 edition, as adopted in R 408.11202, except for the following: (a) Pipe shall be not less than schedule 40 and fittings not less than standard weight in sizes up to and including 6-inch nominal.(b) Copper tubing shall be type K or L.(6) A hose connection and hose complying with R 408.11233 may be used to connect the outlet of a manifold pressure regulator to piping if the working pressure of the piping is 250 p.s.i.g. or less, and the length of the hose does not exceed 5 feet.Mich. Admin. Code R. 408.11241