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On board FPSO, the gas injection commissioning phase is ongoing. We have a PCV installed here to control high pressure gas injection up to 290 bar.
the control valve was calibrated and function checked ok when there is no pressure on the line. The valve is an 8" globe type with spring diaphragm Fisher type 667 actuator and fisher body type EHT-1.
The problem is that when there is a high pressure 245 bar upstream and downstream of the PCV in manual control mode, the valve is not controlling correctly and not even going to 0 % position, sticking at bet. 4 to 10 % @ 4 mA signal from CCR.
Fail-close action of the valve was proven well under no pressure condition.
Somebody suggested to adjust bench set of the actuator and we tried but not done and difficult with 245 bar on the line.
This is my first time to seek help from the web and I hope I got the best site and answers from the experts online. Thank you very much
the control valve was calibrated and function checked ok when there is no pressure on the line. The valve is an 8" globe type with spring diaphragm Fisher type 667 actuator and fisher body type EHT-1.
The problem is that when there is a high pressure 245 bar upstream and downstream of the PCV in manual control mode, the valve is not controlling correctly and not even going to 0 % position, sticking at bet. 4 to 10 % @ 4 mA signal from CCR.
Fail-close action of the valve was proven well under no pressure condition.
Somebody suggested to adjust bench set of the actuator and we tried but not done and difficult with 245 bar on the line.
This is my first time to seek help from the web and I hope I got the best site and answers from the experts online. Thank you very much