StacksVerified U.S. regulatory reference

46 CFR §56.70-20

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Qualification of welding procedures and welders is required, and must comply with the requirements of Section IX of the ASME BPVC (incorporated by reference; see § 56.01-2) as modified by part 57 of this subchapter.
  2. (b)Each butt-welded joint of Class I of Class I-L piping must be marked with the welder's identification symbol. Dies must not be used to mark the pipe where the pressure exceeds 600 psig or the temperature exceeds 750 °F or in Class I-L systems.