Analysis of the cause of leakage at the large cover during gas-phase pre-cooling of vertical sack pumps
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When the vertical multi-stage centrifugal pump was airtight, no leaks occurred; however, during the gas-phase pre-cooling phase, a leak appeared at the pump’s cover. Upon inspecting the pump body, no abnormalities were found in the sealing O-rings or the flange sealing surfaces. What could be the cause of the leak?
The air is leaking from the flange at the bottom of the inlet and outlet
It’s still likely to be a problem with the O-ring; otherwise, it could be an issue with welding or the material
Color flaw detection was performed and no issues were found. The O-ring was replaced, and upon disassembly it showed no signs of compression or deformation; its elasticity is good
Reason: 1. There is no liquid filling process; vapor is discharged simultaneously with the filling； 2. The cooling rate is too fast; it should generally be kept at no more than 25°C per hour ； 3. No air was released after filling with liquid.
The Central Plains man is an old mage; it’s clear he’s been in many such places before! Where we are, it’s preheating; here it’s precooling. The speed shouldn’t be too fast – we need to give the equipment time to adjust!
Well, we also followed the pre-cooling process step by step
Besides the possible issue with the pre-cooling step, what other factors should I consider?