For DG horizontal multi-stage pumps, it is necessary to tighten the packing repeatedly; water seeps out from the packing area as soon as the pump stops running. What is the problem?
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It is a DG horizontal multi-stage pump; a large amount of water leaks from the packing area. After shutting down the pump, the packing gland is tightened until only a slight drip of water occurs, and the pump operates normally. Yet as soon as it is restarted, water starts leaking again in large quantities, and this cycle repeats itself. The same problem persists even after replacing the packing gasket; water leaks out as soon as the pump is stopped, once the gland is tightened. What kind of problem is this? How to solve it?
According to what you said, it should be the packing at the inlet end of the pump. I’ve encountered this issue before; it was caused by insufficient tightness between the packing and the packing tray. But if the fastening bolts haven’t stripped, then this problem shouldn’t occur. If it still happens, you can try turning the disc inside the pump that is used to cool the packing seal. There’s a small hole on this disc through which water flows to the packing gland; you can insert a gasket there and make a small hole in the gasket so that less water flows through
When the machine is stopped, the fluid is at rest; when it is running, the fluid rotates around the axis, so its state is different. Packing seals do not have self-compensation capability, and this is a relatively common phenomenon.
Try adding a skeleton oil seal at the end of the filler! Hope this helps!
In such cases, we also use multiple compression points for the packing to reduce leaks when it is at rest. If it’s stopped and then started without any leaks, smoke will appear