Safety Valves for Power Generation
Boiler safety valves in power generation are governed by ASME Boiler and Pressure Vessel Code Section I (power boilers) — the most stringent safety valve standard, requiring certification by an ASME-authorised inspection agency (AI) and stamped with the V (steam boiler safety valve) symbol. Vajra Industrial Solutions supplies ASME Section I and Section VIII safety valves in alloy steel (WC6, WC9, P91) for steam drum, superheater, reheater, and economiser service, with IBR registration mandatory for Indian power plants.
Key Applications — Safety Valves in Power Generation
Steam Drum Safety Valves (Boiler Drum)
ASME Section I spring-loaded safety valves for drum-type boiler steam drum overpressure protection. Set pressure at or below boiler MAWP. Required capacity: at least one valve set at or below MAWP, additional valves set no more than 3% above MAWP. Pop action (rapid full lift) characteristic required per ASME I. IBR stamp mandatory for Indian boilers.
Inlet DN50–DN200, Class 300–600, WCB / WC6, ASME Section I (V stamp), IBR Schedule IV
Superheater Outlet Safety Valves
Alloy steel (WC6 or WC9) ASME Section I safety valves for superheater outlet at high temperatures (450–600°C). Extended bonnet with finned radiator to reduce packing temperature. P91 (9Cr-1Mo-V) body for ultra-supercritical (USC) boilers above 600°C. Set pressure ≤MAWP of the superheater outlet header.
Inlet DN50–DN150, Class 600–1500, WC9 / P91, ASME Section I (V stamp), 600°C rated
Reheater Safety Valves
Safety valves on cold reheat and hot reheat piping for turbine reheater protection. Low-pressure (Class 150–300) but high-temperature (400–565°C) service. Alloy steel WC6 or WC9. Reheater safety valve capacity must cover the full reheater steam flow if the turbine trips and the reheater remains in service.
Inlet DN80–DN200, Class 150–300, WC6 / WC9, ASME Section I, extended bonnet
Pressure Vessel and HRSG Protection
ASME Section VIII safety valves for heat recovery steam generators (HRSG), deaerators, flash tanks, and feedwater heaters in combined-cycle power plants. UV-stamped valves for pressure vessels not classified as power boilers. Low-pressure HRSG LP drum safety valves in WCB; HP drum in WC6.
Inlet DN25–DN150, Class 150–600, WCB / WC6, ASME Section VIII (UV stamp), API 526
Required Certifications
Recommended Materials
Selection Factors
Technical FAQs
What is the difference between ASME Section I and Section VIII safety valves for power plants?
What is IBR and when is it required for power plant safety valves in India?
Other Power Generation Valve Guides
Safety Valves in Other Industries
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Safety Valves for Power Generation
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