The bottom pump is evacuated
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How should vacuum in a atmospheric pressure bottom pump be addressed due to excessive seal oil injection from the standby pump? Seeking an answer
Consider the following: 1. Is the injected sealing oil too light, or does it contain water? Try using a heavier sealing oil instead； 2. When the pump is in standby mode, reduce the amount of seal oil supplied or stop supplying it altogether (consult the pump manufacturer for specific details)
1. The mechanical seal may be damaged. 2. Replace the key sealing oil.
It might be due to the sealing oil; however, it’s possible that the sealing oil contains water, or that circulating water has leaked into the pump. This requires a mechanic to disassemble and inspect it to determine ；
For normal bottom pumps, a reduced-four-wire system is basically used for seal oil; the light seal oil will inevitably vaporize, regardless of the amount injected.