Subpart 53.05. Subpart 53.05—Pressure Relieving Devices (Article 4)

• § 53.05-1 - Safety valve requirements for steam boilers (modifies HG-400 and HG-401).
• § 53.05-2 - Relief valve requirements for hot water boilers (modifies HG-400.2).
• § 53.05-3 - Materials (modifies HG-401.2).
• § 53.05-5 - Discharge capacities and valve markings.