Problems with parallel pump installation
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Can a pump that operates intermittently draw water up? Intermittent pump time control: it stops for a while and then operates automatically for a while.
Whether water can be pumped depends on the liquid level; if the level is above the pump’s inlet pipe, there should be no problem
Is the pipeline filled with liquid after the pump is stopped? If it stops and there’s no liquid left, it definitely can’t be used
Will the two pumps that operate 24 hours a day draw out the water from the inlet of the intermittent pump? When the intermittent pump starts, there is no water in the inlet pipeline, or there is a gas space; all three pumps are located below the liquid level
If the static head is sufficient and there is no blockage in the upstream piping, then there will be no problem
It seems that the main pipe with DN40 diameter is a bit too small; it’s just enough to allow two pumps to operate properly. Putting the third pump into use may not ensure good water intake, even in the case of backflow.
I seem to have seen a specification stating that when multiple pumps are connected in parallel, the inlet pipes of the pumps should be led out from above the main inlet pipe!
The inlet pipeline seems a bit small~~