- § 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.
§ 53.05-1 - Safety valve requirements for steam boilers (modifies HG-400 and HG-401).
(a) The pressure relief valve requirements and the safety valve requirements for steam boilers must be as indicated in HG-400 and HG-401 of Section IV of the ASME BPVC (incorporated by reference; see § 53.01-1) except as noted otherwise in this section.
(b) Each steam boiler must have at least one safety valve.
§ 53.05-2 - Relief valve requirements for hot water boilers (modifies HG-400.2).
(a) Relief valves. The relief valve requirements for hot water boilers must be as indicated in article 4 of Section IV of the ASME BPVC (incorporated by reference; see § 53.01-1) except as noted otherwise in this section.
(b) Hot water heating boilers. Each hot water heating boiler must have at least one safety relief valve.
(c) Hot water supply boilers. Each hot water supply boiler must have at least one safety relief valve and a temperature relief valve or a pressure-temperature relief valve. The valve temperature setting must not be more than 99 °C (210 °F).
§ 53.05-3 - Materials (modifies HG-401.2).
Materials for valves must be in accordance with HG-401.2 of Section IV of the ASME BPVC (incorporated by reference; see § 53.01-1) except that nonmetallic materials may be used only for gaskets and packing.
§ 53.05-5 - Discharge capacities and valve markings.
The discharge capacities and valve markings must be as indicated in HG-402 of Section IV of the ASME BPVC (incorporated by reference; see § 53.01-1). The discharge capacities must be certified by the National Board of Boiler and Pressure Vessel Inspectors.