SUBPART 53.05—Pressure Relieving Devices (Article 4) (§53.05-1 to §53.05-5)
- 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.