Subpart 52.20. Subpart 52.20—Requirements for Firetube Boilers

• § 52.20-1 - General (modifies PFT-1 through PFT-49).
• § 52.20-17 - Opening between boiler and safety valve (modifies PFT-44).
• § 52.20-25 - Setting (modifies PFT-46).