Safety & Relief Valves for Power Generation (Thermal, Gas, Hydro)
Gate, globe, check, and safety valves for steam and condensate service in thermal power stations - ASME Class 600–2500, A217 WC9 and C12A (P91) materials, IBR certified.
Which safety & relief valves are used for power generation (thermal, gas, hydro)?
Coal-fired thermal power stations, combined cycle (CCGT) plants, and waste heat recovery units require the highest grade of high-temperature, high-pressure valves for main steam, hot reheat, cold reheat, and feedwater service. ASME B16.34 Class 600–2500, alloy steel materials (WC9, P91), IBR certification, and ASME Section I safety valves are standard requirements.
Safety Relief Valve (IBR / ASME Sec. I)
Boiler drum and superheater outlet safety valves - mandatory IBR certification for Indian power plants
Critical Requirements
- IBR certification mandatory for all boiler and steam line valves in India: Form III-C + Form III-E
- ASME B16.34 Class 600–2500 pressure-temperature ratings for main steam service
- High-temperature alloy steel: A217 WC9 (566°C max), C12A/P91 (649°C max)
- PWHT (Post-Weld Heat Treatment) for all Cr-Mo and P91 welds
- Stellite (Cobalt alloy) seat and disc facing for erosion and thermal cycling resistance
- Full-penetration butt-weld ends (BW) with ASME B16.25 dimensions for power piping
Service Challenges
- High-temperature steam (538–566°C for WC9, 600–649°C for P91) - creep properties are critical
- Steam condensate - carbonic acid (CO₂ in condensate) attacks carbon steel; use SS or alloy steel
- High-velocity steam (main steam 300+ m/s in turbine bypass) - erosion of seats; Stellite facing required
- Thermal cycling (cold start to full load) - thermal fatigue in welded joints and valve bodies
- Stress relaxation in fasteners at elevated temperature - special bolting materials required
Vajra Safety & Relief Valves
Pressure relief and safety valves for overpressure protection of vessels and systems.
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