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Turbine inlet On/Off Valve

Turbine inlet On/Off Valve

Turbine inlet On/Off Valve

I need to know what is the effect of having ON/OFF valve on the steam inlet TO turbine in fail close vs. fail open?
The purpose of the turbine is to drive rotary pump continuously. There is a 2" ball on/off valve on the steam inlet to the turbine.
Most of the turbine inlet valves are fail open.

RE: Turbine inlet On/Off Valve

If this valve is in safety shutoff service, it should be FC. Else this can only be an operational or control valve in on / off service.

RE: Turbine inlet On/Off Valve

If the turbine begins to over speed, the main steam inlet flow to turbine must be shut off immediately ; if not it will add energy to the rotor sustaining its acceleration with a risk on machine mechanical integrity ; safety / hazard consequences including potential catastrophic failures can occur because of turbine over speed.

RE: Turbine inlet On/Off Valve

Most turbines I've dealt with have an overspeed trip built right in, often directly acting upon a separately-actuated valve that functions independently of any other shutdown system. If that is the case here, overspeed trips should not become part of this discussion.


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