Analysis on the reasons why the pilot-operated safety valve at the top of the circulating hydrogen desulfurization tower does not trip before the tripping pressure is reached
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The pilot-operated safety valve at the top of the circulating hydrogen desulfurization tower tripped before the tripping pressure was reached. After the tripping, the reaction pressure dropped rapidly. It did not return to the seat after it dropped to the design return pressure. It did not return to the seat until the hand valve in front of the safety valve was closed. Discuss the reason why this happened. Have you ever encountered this kind of situation?
1 Safety valve failure 2 Safety valve not inspected on time 3 System pressure fluctuates significantly
The safety valve has not been inspected for more than three months, and the system pressure is relatively stable. Now I suspect that the safety valve is faulty, but I cannot find where the fault is. It has tripped twice.
It's hard to say. It should be a malfunction.
The safety valve reseat pressure is low. If it is closed and reseated and then opened again, the safety valve can still be used normally, and there will be no problem.
It means that the safety valve has failed and needs to be re-calibrated.
The safety valve must be faulty. Replace or recalibrate
Disassemble and inspect the pilot safety valve and main safety valve. We have had this problem in the past, and the springs have cracked and failed.