What should I do if the centrifugal pump is evacuated? Understand these hearts are not panic!

After the pump is evacuated, or during the pumping process

1) The vibration of the pump body is large, and the dynamic and static rings of the mechanical seal will continuously collide intermittently, resulting in leakage, and the mechanical seal structure will be ineffective in severe cases;

2) The compression of the dynamic seal of the mechanical seal is the sum of the medium pressure and the preload of the spring. When the pumping is empty, the medium pressure will be no, the contact pressure of the static and dynamic ring will become smaller, and the seal will be invalid;

3) After the pump is evacuated, the mechanical seal of the static seal ring using the self-flushing scheme (ie flushing with the pumping medium) loses cooling and lubrication, and dry friction occurs, and the mechanical seal fails.

First, the incidental situation

1. The motor current drops.

2. The pressure fluctuated greatly.

3. The flow is abnormally fluctuating.

4, the noise is abnormal.

5. The pump body vibrates.

6. The temperature of the pump cylinder rises.

Second, the cause of the evacuation

1. Air leakage occurs at the inlet of the centrifugal pump.

2. Blockage occurs at the inlet of the centrifugal pump.

3. The pressure at the inlet of the centrifugal pump is not enough.

4. The temperature of the medium at the inlet of the centrifugal pump is too high and the saturated steam is too large.

5. The centrifugal pump inlet valve is not open or the spool is detached.

6. The centrifugal pump outlet opening is too large (small).

7. The centrifugal pump seals the oil with water.

8. The liquid level in the centrifugal pump tower or vessel is low or no liquid level.

9. Centrifugal pump impeller or セ饶セセニ鹧ニ鹧/span>

10. The centrifugal pump motor is reversed.

Third, the corresponding processing method of evacuation

1. If the inlet leaks, stop the pump and check the leakage inlet line and flange of the centrifugal pump.

2. If the inlet is blocked, the pump should be stopped to check the leakage inlet line and impeller of the centrifugal pump, and then purged for maintenance.

3. If the inlet pressure is not enough, the liquid level back pressure should be increased.

4. If the temperature of the inlet medium is too high, the temperature of the medium should be lowered, and the steam in the centrifugal pump should be emptied and drained.

5. If the inlet valve is not open or the spool is detached, the valve should be opened or replaced after the pump is replaced.

6. If the outlet opening is too large (small), the valve opening should be adjusted appropriately.

7. If the oil is sealed with water, the oil tank should be dehydrated.

8. If the liquid level in the tower or the container is low, the centrifugal pump outlet valve should be temporarily closed or the pump should be stopped, and the liquid level should be restored after the liquid level rises.

9. If it is an impeller or a セ セ セ ニ穑 蛴 适 适 ? ? 懈 懈 弧 弧 / s s s s s

10. If the motor is reversed, the steering should be adjusted in time.

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