In regards to pool pumps, I was told that if I increased the pipe size from 1.25" to 1.5", my 1hp pump would draw more power because of the increased rate of flow. They backed up that claim with "head curves" from pool pump manufactures showing an increase in HP required for low-head, high-flow. It was my general understanding that reducing pipe friction would reduce power requirements, not increase them. My thoughts are that the reason for higher power draw at the higher flow rate on the mfg. curve chart is because there is higher friction. However, if the flow rate increases just because I reduced resistance to flow why would it draw more power when the RPM stays the same?
I am sorry if this is appears to be too basic of a question but it seems to go against logic. If they are correct, could somebody help a non-hydraulic engineer understand this?
For a background of what I've been told but haven't been convinced by, you can read this thread:
Note the graph below DOES NOT represent my single-speed 3450 RPM 1HP pool pump but is something I have been referred to, to visualize the increase in power draw.
Thank in advance for the engineering lesson!
I am sorry if this is appears to be too basic of a question but it seems to go against logic. If they are correct, could somebody help a non-hydraulic engineer understand this?
For a background of what I've been told but haven't been convinced by, you can read this thread:
Note the graph below DOES NOT represent my single-speed 3450 RPM 1HP pool pump but is something I have been referred to, to visualize the increase in power draw.
Thank in advance for the engineering lesson!