Quote:
|
Since87, thanks for the data. I gather from your explanation that the gains to be made from a parallel system are negligible compared to a series setup? ( with low restriction blocks)
|
I also showed curves for White Waters and that the flowrate is also higher in the series case with what few would call a "low restriction" block.
A pump with an unrestricted outlet is actually doing more
work (moving water) than a pump with a restricted outlet.
I did some power consumption measurements on a Danner Mag5 and found that the power consumption dropped as the flow was restricted. This was counterintuitive to me at the time so I brought the issue up in
this thread. I think most of your questions aside from pump longevity are answered there.
There may be more stress applied to the impeller in the restricted case, but considering the construction of Iwaki impellers, I have a hard time imagining the impeller itself ever failing due to backpressure. (That there is more stress on the impeller in the restricted case, is purely speculation on my part.)