Mechanical seal leakage
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Reasons for intermittent leakage of the mechanical seal in double-suction pumps
Could you describe the specific operation details, or record a short video or something, so that everyone can analyze it?
It’s likely that the sealing surface is no longer functional; it is recommended to remove the seal and grind the surface
Intermittent leakage occurs at the mechanical seal during operation, and the pressure on the pressure gauge drops. The mechanical seal continues to leak after the pump is stopped.
If there are spare parts available, replace the mechanical seal – it’s likely damaged with the sealing surface worn out. When replacing it, check the condition of the shaft as well. Additionally, the springs in the mechanical seals of double-suction pumps are different, and their rotation directions are opposite; this is something to keep in mind
It seems you’re in a hurry; it’s best to switch to a backup pump and repair this one
It’s hard to tell with just these few clues; there are too many factors that could cause intermittent leaks.