Dry gas seal flow control system
Dry gas seal flow control system
(OP)
Good day!
Work with Dresser Rand back to back centrifugal compressor (pumping natural Gas).
From data sheets, Dry gas seal flow control system (see attach) is desing for normaly work when discharge pressure after compressor is 90 bar. Just now we want to work with discharge pressure 65bar, in this mode the control comand what is being passed to FCV-1611(flow control regulator) all time varying from 23% - 27% and also PDIT_1611, PDIT_1612(pressure diff on orifice) values varyate of course. If we increase the discharge pressure above 89 bar the seal system start work stable, control comand what is being passed to FCV-1611 stay stable at 23%.
Flow control valve is - emerson model 24000 with positionner DVC6010.
my question is:
1) I need to re-tuned the DVC6010 or change the flow orifices FE_1611, FE_1612.
attach - ht tp://files .engineeri ng.com/get file.aspx? folder=7cc 02a68-4e87 -4ef8-8ff4 -7508de2c2 740&fi le=flow_sy stem_1.bmp
Thanks,
Work with Dresser Rand back to back centrifugal compressor (pumping natural Gas).
From data sheets, Dry gas seal flow control system (see attach) is desing for normaly work when discharge pressure after compressor is 90 bar. Just now we want to work with discharge pressure 65bar, in this mode the control comand what is being passed to FCV-1611(flow control regulator) all time varying from 23% - 27% and also PDIT_1611, PDIT_1612(pressure diff on orifice) values varyate of course. If we increase the discharge pressure above 89 bar the seal system start work stable, control comand what is being passed to FCV-1611 stay stable at 23%.
Flow control valve is - emerson model 24000 with positionner DVC6010.
my question is:
1) I need to re-tuned the DVC6010 or change the flow orifices FE_1611, FE_1612.
attach - ht
Thanks,





RE: Dry gas seal flow control system
is there a reason you do not forward your query to DR?
with lower inlet pressures to FCV-1611, this control valve will need to open more to meet the required flow rates at FE-1611 & FE-1612. insufficient detail on fcv-1611 is given as there are various trims available. suggest you forward your criteria to your local emerson rep and ask them. you may need to change valve trim
at the lower inlet pressures.
hope this helps.
-pmover
RE: Dry gas seal flow control system
"change valve trim" - This mean i need to recalibrate positionner DVC6010, change valve respons time, open time.
i add also flow rate at FE-1611 & FE-1612.
straight line is when we increis pressure.
RE: Dry gas seal flow control system
also, when it was suggested to change the trim, that means to modify the internal parts of the bauman 24000 valve. there could be different internals to the valve which would change the flow range of the valve for different conditions. you should not need to do that and should be able to provide enough flow with the existing hardware. As you described, "acting unstable" is definitely requiring a re-tune.