Centrifugal pump operation
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When using a jog pump to determine the direction of rotation, is this operation performed before filling the pump or after filling it?
Just do a brief test run before priming the pump; it doesn’t matter.
From a practical standpoint, it would be desirable to be able to perform jog operations after filling the pump in order to avoid damaging the seal. In reality, however, jog operations are used to check the direction of rotation, and this is done after the new equipment has been installed and the motor wiring is complete. At that point, there is no fluid in the system, so jog operations can only be performed with an empty pump
Reply to 3# Dongcheng Xijiu zq: It can be done before or after; having materials on hand would be better, but the outlet valve must be closed
For machine seals, the latter is definitely better. In real life, a light tap has little impact.
For centrifugal pumps that can be reversed, short-cycling is performed both before and after filling in actual operation; however, for centrifugal pumps for which reversal is strictly prohibited, the motor must be disconnected from the pump head in order to test reverse and forward rotation, such as rubber-lined pumps and plastic-lined pumps. Read the pump’s instruction manual more carefully; the most reliable way is to disconnect the motor from the pump head and test its rotation in both directions, although this is a bit more troublesome.
We seek convenience, so generally before filling the pump.
It is ideal to disconnect the coupling and run the motor without a load