Will it have an impact on the pump if the actual head of a centrifugal pump is much lower than its rated head?
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As the title suggests, for example, a pump with a head of 30 meters actually only needs a head of around 2 meters. They say cavitation will occur, but by analyzing the pump’s performance curve and the pipeline’s characteristics, I simply can’t understand why this is the case At most, it’s just less efficient
I can’t figure it out; could you help me analyze and explain it from a theoretical perspective?
As long as the motor current is kept within the standard limits using the outlet valve, there will be no problem.
Let’s take a look at how the outlet pipeline is designed Cavitation to a level that is not excessive
The key is to ensure that the flow rate operates within the range permitted by the pump; the motor should not experience excessive current at the upper flow limit, and the lower limit should be above the minimum allowable flow rate (it’s best to operate within the optimal operating range). As long as the piping and equipment downstream of the pump can handle the pressure without issues, then everything is fine
Generally, it is the pipeline that determines the pump selection
A pump with a 30m head actually only needs 2m; the difference is enormous – it’s a severe mismatch that results in high power consumption. If it operates continuously throughout the year, the additional electricity cost each year could be used to purchase several suitable pumps. It’s best to replace the pump as soon as possible.
Cavitation is only related to the pump inlet temperature and suction lift, and not to the pump head. To keep the pump’s head at 2m, it is economical to control the pump’s speed using an inverter.
It’s a typical case of using a big horse to pull a small cart – such an approach results in very low efficiency; it’s necessary to make a change as soon as possible