EN
Power plant overpressure protection is the core of stable and safe power generation operation. Selecting the correct pressure safety valve PSV, main pressure relief valve, and auxiliary pressure protection equipment directly determines the operational safety of boilers, steam pipelines, turbine auxiliary systems, and thermal power units. For power plant engineers and procurement teams, distinguishing pressure reference standards and matching professional pressure relief valves is the key to avoiding unit shutdown accidents and equipment damage.
Most power plant pressure failures are caused by inaccurate pressure value conversion and mismatched spring loaded safety valve parameters. According to industrial operation data, more than 25% of power plant pipeline overpressure protection failures stem from confusing gauge pressure and absolute pressure, as well as incorrect psi/MPa unit conversion of imported valves.
1. Core Pressure Standard for Power Plant PSV Configuration
Almost all power plant boiler systems, steam transmission pipelines, and circulating water pressure systems adopt gauge pressure as the calibration standard for pressure relief valve set pressure. The atmospheric pressure offset (0.1MPa) can be ignored in conventional power plant pressure setting, which is also the unified standard of domestic and foreign thermal power industry API and ASME specifications.
For high-precision turbine vacuum systems and condensed water thermodynamic calculation scenarios, engineers need to convert to absolute pressure for auxiliary verification to ensure the main pressure relief valve can respond accurately under extreme pressure changes.
2. Common Pressure Unit Conversion for Power Plant Valves
Power plants are equipped with both domestic GB standard valves and American/European imported valves, involving multiple pressure units. Fast and accurate conversion is the basic requirement for pressure relief valve manufacturer selection and on-site commissioning:
- 1.0 MPa = 145 psi = 10.2 kgf/cm² (conventional boiler safety valve standard pressure)
- 2.0 MPa = 290 psi (high-pressure steam pipeline spring loaded safety valve setting range)
- 0.1 MPa = 14.5 psi (plant utility compressed air system protection)
3. Exclusive Valve Application Solutions for Power Plants
Power plant high-temperature, high-pressure, and continuous operating environment puts forward higher requirements for valve stability and durability. Xiazhao Valve’s customized power plant pressure protection products cover full-scenario applications:
- Enclosed angle-type spring loaded safety valve: Fully enclosed structure without exposed springs, anti-high temperature steam corrosion, suitable for boiler main pipeline and high-pressure steam system, avoiding spring failure caused by long-term steam erosion.
- Pilot-operated PSV valve: Adapt to large-diameter and variable backpressure working conditions of power plant units, stable opening and closing pressure, no frequent jumping, ensuring long-term continuous operation of the unit.
- Fire safe ball valve: Matched with power plant fuel oil and flammable medium pipelines, supporting emergency cut-off and pressure relief linkage.
- Oil pressure control valve: Used for power plant hydraulic lubrication and unit pressure regulation systems to maintain stable system pressure.
4. Power Plant PSV Selection Mistakes to Avoid
Many power plant maintenance teams mistakenly use absolute pressure parameters to calibrate boiler pressure safety valve PSV, resulting in 0.1MPa fixed pressure deviation, which leads to the valve failing to open in time under overpressure conditions and causing pipeline burst risks. In addition, blindly adopting psi-standard imported valves without accurate conversion will cause mismatch between valve rating and domestic system pressure.
As a professional relief valves manufacturers serving many thermal power plants, Xiazhao Valve provides free pressure parameter verification and valve type selection guidance for power plant projects, strictly complying with API 520, API 526 and power industry standards.
