There is a problem somewhere in this liquid flow control system. The controller is in automatic mode, with a setpoint of 65%, yet the flow indicator and the flow controller both register 0.3%: (nearly) zero flow. A P&ID of the loop appears here:
Explain how you would begin troubleshooting this system, and what possible faults could account for the controller not being able to maintain liquid flow at setpoint.
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One possible fault has to do with the control valve: perhaps something has happened to make it fail closed (loss of air supply, signal, etc.). Other possible problems include the following:
A good “first test” for troubleshooting the loop is to check the controller output: is it trying to open up the valve?
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It would be nice to know how the pump is controled?
Is it by a VFD? Is it binary (on and off).
If the valve is closed, with out an interlock with the pump, the pump will dead head and go out on overload. With out the pump interlock, the FIC will be lost.
This is not a very well designed loop.
Sorry last e mail address had a typo.