Discussion on Question 4 of Issue 277 [Test Your Knowledge]
Thread Content
Original title: 4. A centrifugal pump with a head of 20m cannot lift water to a height greater than 20m. The forum provides the reference answer: Yes. I believe the correct answer to this question should be: No. Reason: The head of a centrifugal pump stated to have a head of 20m refers to the head indicated on the equipment’s nameplate (the nominal head), that is, the head of the pump at its point of maximum efficiency. In actual operation, the pump is usually not at this point of maximum efficiency; according to the pump’s flow characteristic curve, when the flow rate is below that corresponding to maximum efficiency, the head can exceed 20m. Therefore, in practice, a pump with a head of 20m is capable of lifting water to a height of more than 20m. Let’s discuss!
I agree with LZ’s opinion; I think it’s fine too
I agree with the original poster’s view, because from the pump performance curve, reducing flow rate can increase head pressure.
The inlet pressure of the pump can be increased, and then the water height might exceed 20 M
Who said it’s just a nominal head? It’s possible to reach 20m by increasing the pressure――just my humble opinion
Support the original poster! This question is probably wrong
Hehe, welcome everyone to discuss! I agree with the original poster’s opinion too! ! Everyone is welcome to share their opinions further! ! Our goal: to learn!
By reducing the diameter of the outlet pipe and decreasing the flow rate, the head can be increased; I agree with LZ