What causes severe heating in the balance pipe of a centrifugal water pump?
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In one of our units, the temperature of the balance pipe reaches seventy or eighty degrees within just a few dozen seconds after the fire pump starts. We have checked and confirmed that the balance pipe is unobstructed; we would like to know whether the water inside the pump’s balance pipe is in a state of circulation Is this situation caused by the inability of the water in the balance tube to circulate? What could be the reason for the inability to balance the water and prevent it from circulating within the pipe (blockage of the balance pipe has been ruled out)? I earnestly beg experts to help answer this question. Thank you!
It’s very likely that the water in the balance tube cannot circulate, though I also can’t explain why. Waiting for the expert to explain.
If you need to check, do it thoroughly – check that the balance tube is not blocked, and also ensure that there is nothing blocking the threads or connections at the high-pressure and low-pressure ends connected to the balance tube.
The pump output flow is low or absent, and the flow velocity in the balance pipe is too high; this is specifically caused by manually starting the pump directly； Interlocks should be activated; it is safest to have the fire hydrants or fire pumps turned on, so that the fire pump starts automatically once the pressure in the pipeline system drops.