Selection of steam safety valves
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Seeking expert advice: I’m facing this issue right now. The normal operating inlet pressure for the turbine is 9.8 MPa. According to the parameters provided by the manufacturer, an alarm is triggered at 10.3 MPa, and the turbine stops operating at 10.7 MPa. Steam must be depressurized at the inlet end in order to be suitable for operation; then how should the safety valves on the pipeline be installed? I asked the valve manufacturer, and they said that the safety valve can ensure sealing at 90% of the set pressure, but not beyond that level. So if the set pressure is set at 10.3 MPa, the safety valve is likely to be in a leaking state at 9.8 MPa.
Safety valves serve a protective purpose, with their setting pressure being at or below the design pressure of the equipment they are meant to protect. A good safety valve can maintain its sealing property at 93% of its set pressure