Answer / sohail malik sngpl pakistan

Antisurge control system is basically to protect the for
example boost compressor.
surge may occur in a gas compressor when the suction flow
may decreases and the isontropic head going to rise then
our surge margin reduces and condition goes to compressor
surge.
in anti surge control system an control valve works for
example if suction flow reduces this valve open to allow
discharge pressure into suction resultant the our condtion
goes to safe margin.
in antisurge control system if 25% reduces in suction flow
antisurge system generate 1 pulse and if 5 pulses generate
in 10 seconds the turbine engine or other facility should
be Shutdown.

Answer / ales jan

above ans is right

Answer / senthil.doosan@yahoo.com

it is not simple..
its complicated.
setpoints we have
-High surge flow
-low surge flow
-high surge pressure
-low surge pressure
-safety margin
for actual calculated flow we need
-molecular weight
-actual pressure
-actual temp
-flow coefficient
-internal pipe dia
-comressor flow
-density of gas
-dp
Controls:
we have
- surge flow control(Actual flow with calculated flow)
- discharge pressure control( Actual dicharge pressure with
setpoint pressure)
finaly,
the maximum of this control is given as deviation to the
master control which control the antisurge valve..

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