Flow control instrumentation system fault analysis steps

Posted by igeelee on May 8th, 2019

(1) Flow control When the instrumentation system reaches the minimum value, first check the on-site instrumentation. hose crimping tool. If it is normal, the fault is on the instrumentation. When the on-site instrumentation indicator is also the smallest, check the valve opening degree. If the valve opening degree is zero, it is often a fault between the regulator valve and the regulator. When the on-site detection instrument indicates the minimum and the adjustment valve opening is normal, the cause of the failure may be caused by insufficient system pressure, system piping blockage, pump failure, media crystallization, improper operation, and the like. If it is a fault in the instrument, the reasons are: the orifice differential pressure flowmeter may be a positive pressure pilot conduit plug; the differential pressure transmitter positive pressure chamber leak; the mechanical flowmeter is a gear stuck or a filter plug.

(2) When the flow control instrument system indicates that the value reaches the maximum, the test instrument will often indicate the maximum. At this point, the manual remote control valve can be opened or closed. If the flow rate can be lowered, it is generally caused by the process operation. If the flow value does not drop, it is caused by the instrumentation system. Check whether the regulating valve of the flow control instrument system is operating; check whether the measuring system is normal; check whether the signal transmission system of the instrument is normal.

(3) Flow control instrumentation system indicates that the indication value fluctuates frequently, and the control can be changed to manual. If the fluctuation is reduced, it is the cause of the instrument or the PID of the instrument control parameter is not suitable. If the fluctuation is still frequent, it is the process operation. Caused by the reasons.