Can two magnetic pumps with a head of 20m be connected in series to achieve a delivery head of 40m?
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Can two magnetic pumps with a head of 20m be connected in series to achieve a delivery head of 40m? There shouldn’t be any problems, right?
Theoretically, it’s possible; booster pumps or multi-stage pumps work in this way
This is the principle behind two-stage systems: the first-stage impeller has a diameter of 20 meters, while the second-stage impeller is used to increase the head pressure
It is also necessary to consider whether the latter pump can withstand the pressure increase generated by the former pump
Theoretically, this result is possible. However, the required operating pressure for each pump is limited. For example, in terms of sealing, its capacity is fixed and is suitable for the pump to be used alone as designed. If this pressure is exceeded, leakage will occur; in severe cases, the seal may be damaged. So they cannot be used in series.
1 If the pump installation locations are close to each other, the pressure-bearing capacity of the second pump must be taken into consideration. 2 If the second pump can be used at a pressure about 20 above that of the first pump.
Personal opinion: 1. Using pumps in series can increase the pumping head, but it does not necessarily double it; a analysis based on both the characteristics of the pipeline and those of the pumps is required. 2. The second pump should take into account issues such as pressure resistance and sealing.
Theoretically, this is no problem, but in practice, it’s best not to use two identical pumps in series； This problem had already occurred in previous projects; the location specified by the sewage owner for the pipeline delivery was incorrect, and the pump chosen initially was not able to reach that location. So the owner purchased another identical pump and connected it instead. At first, there were no issues, but the second-stage pump kept breaking down. On one hand, the pressure at the suction end of the second-stage pump was too high, which exceeded the pump’s design capacity; on the other hand, the sewage contained certain solids that caused erosion.
The head should be a bit lower than 40. As for impeller erosion, it depends on the medium and the material of the impeller
In chemical production, two pumps cannot be used simultaneously unless the head output of one pump is insufficient and the other serves as a backup