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..

how many mmwc are eual to 1kg/sq.cm & can we calculate mmwc into tph?

2 Answers  

---

principle of rtd

4 Answers  

---

Explain, and give a real-world example of MODULATING control

1 Answers  

---

What is PLC(programmable logic control)?

1 Answers  

---

Please any one can explain how to calibrate transmitter (smart) online with out remove from the container suppose it is interface level or static pressure level measurement we dont want to remove transmitter from the container mean it is running plant please give me detail. thankx brothers

1 Answers   KNPC,

---

what will be the output of the temparature transmitter if temp is 120 degre celcius.

1 Answers   Base Automation, NTPC, PDO,

---

I want to know the questions asked in ONGC interview(after being selected in the written exam) for Instrumentation branch.Kindly help.

0 Answers  

---

Can anyone convert a 5/2 way or 3/2 way valve into an ISO valve?

0 Answers  

---

hi sir yhis is zahid ali i am preparing for the jspl at oct.4.please send me the recently updated sample paper.

0 Answers   Jindal,

---

In my company plc based winders are operated. one day there was a data transmission failure alarm shown on pc. as per sir instruction we have reset master plc but winders were not triped and alarm gone. so what master plc do?

0 Answers  

---

we are using centum vp as monitoring with Dell precision work station T3600 but some times PC(s) are restarted automatically . how we can solve this problem? thanks

0 Answers   Oil India,

---

Please asked me How calculate DCS controller memory.

0 Answers   Yokogawa,

---