Ask a very simple question about the suction capacity of a centrifugal pump
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How is the design of the centrifugal pump’s inlet pipeline and the flow rate determined? For example, if the inner diameter of the inlet pipeline is 100 mm, the pump’s flow rate is 200, its head is 60, and the inlet is connected to a tank at atmospheric pressure. The flow rate when 2 pumps are connected in parallel will be lower than 400. What is the maximum flow rate that the Dn100 inlet pipeline can provide if more pumps are connected in parallel? How is this calculated?
It’s not calculated that way. First, determine how much flow you need, and then consider what size pipe is required; your approach is reversed
At the inlet of a centrifugal pump, the water flow is under vacuum conditions, so the flow velocity is high; it’s generally between 4 and 6 meters per second. For a DN100 pipeline, it’s easy to calculate how much water can be delivered
What is the diameter of the inlet pipe for your pump? For a flow rate of 200, I think a 100-diameter pipe is too small; at least a 150-diameter pipe is required
Several pumps are connected in parallel, with the flow rate of the three pumps being over 500 cubic meters. Material properties, pump installation location, and pump selection all need to be considered comprehensively.
This is not a simple issue; the hydraulic calculations for parallel pumps are quite complex. What needs to be calculated is the flow rate at the outlet when pumps are used in parallel, and it’s not as simple as 1+1 – the actual value is much lower than that