Compressor inlet pressure control.

[Indy]

I have a question, just to check that my understanding of inlet pressure control is correct. I have a schematic that shows a PT on the inlet of a compressor. This signal is then fed back to the turbine driving the compressor ( to either speed up or slow down)

My question is: depending on the inlet pressure range is there then a set range of what the outlet pressure can be?

Thanks

 

[georgeverghese]

For production gas compressors, the main parameter to maintain constant is suction pressure. But there are other variables that may at times override this control signal to modulate turbine speed. These may be one of any of the following: high discharge pressure; high turbine exhaust temp (commonly called the T5 override). Also the speed controller ( which acts as a slave controller to any one of the above 3) is max speed limited.

Hence, when all controls are working, the discharge pressure can vary downwards, but is high set limited as set by the high set discharge PC.

 

[LittleInch]

The compressor will have a max and min pressure range base don inlet pressure so yes, you should be able to work out the max and min pressure for min inlet and max inlet pressure.

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