Turbine inlet On/Off Valve

Question

Turbine inlet On/Off Valve

cheme112 (Chemical)

(OP)

22 Dec 16 18:33

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.

georgeverghese (Chemical) · Answer 1 · 2016-12-22 22:00:34

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.

rotw (Mechanical) · Answer 2 · 2016-12-30 21:32:06

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.

crshears (Electrical) · Answer 3 · 2017-01-09 13:30:18

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.

CR

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Turbine inlet On/Off Valve