Sealing of the high-pressure lean amine liquid pump PLAN52: the level of the sealing oil tank has risen to the full level, and the pressure is 0.005 MPa. Please analyze the cause
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The seal of the high-pressure lean-ammonia liquid pump PLAN52 shows that, after operation for some time, the liquid level in the seal oil tank rises to the full level; the pressure is 0.005 MPa, and the temperature of the return seal oil is 55°C. There is no external leakage from the mechanical seal. Please analyze the reasons and provide a conclusion – can the mechanical seal continue to operate?
The fact that there is no external leakage from the mechanical seal only indicates that there is no leakage on the atmospheric side of the seal; it does not mean that there is no leakage on the side in contact with the medium. This situation suggests that a leak has occurred on the side where the sealing medium is present. Since this medium does not vaporize easily, the liquid level in the tank rises while the pressure does not increase. Under normal circumstances, the PLAN52 system should be equipped with alarms for high and low liquid levels. In your current situation, it is recommended to stop the machine for inspection of the seal; continuing to operate it is not advisable