Need guidance on pump selection!
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Flow rate: 14.5 cubic meters, head: 186 meters. What pump type should be chosen, OH? Still BB?
What medium? How were the medium parameters chosen?
High-speed pump, right! Only the OH type 40-400 will do; its efficiency is too low
All of them! OH2 has low efficiency; BB4/BB5 have slightly higher efficiency but the pumps are expensive! You can calculate the difference in power consumption between the two, and see how long it will take to recover that difference! However, if funds are sufficient, it is still recommended to choose a multi-stage pump, as the operating point of a multi-stage pump is closer to the high-efficiency point, while the OH2 pump type is closer to the low-flow point, resulting in less stable operation.