The plunger pump often shuts down due to high-pressure protection at its outlet
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The plunger pump 5ZB-12/30 that I use is used for pumping produced water; typically, the motor’s frequency is set to 30HZ. After checking the outlet pipeline, it was found to be unobstructed. When the pump was started, the pressure at its outlet reached 5.2 MPA, which caused the pump to shut down due to overpressure. What are some solutions to this issue?
There was no overpressure issue before; it worked normally. After being out of use for some time, it started to trigger overpressure protection when turned on these past few days
Changes in the opening degree of valves on the pipeline; is scaling present?
Is the outlet valve malfunctioning, and is the pressure gauge in good condition?
Excessive resistance in the outlet pipeline results in reduced pump flow and increased pressure. Check whether the outlet valve is functioning properly and whether there is any blockage in the outlet pipeline; also verify that the safety valve operates correctly