Fitting a curve to pump data
Fitting a curve to pump data
(OP)
I need to fit a curve to tabulated pump data. Is there some free S/W or an online calculator to do this?
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Fitting a curve to pump data
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RE: Fitting a curve to pump data
RE: Fitting a curve to pump data
H = c1 + c2*Q + c3*Q^2, where H = head, Q = volumetric rate
works close enough.
Regards,
SNORGY.
RE: Fitting a curve to pump data
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"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Fitting a curve to pump data
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Fitting a curve to pump data
http://www.akiti.ca/Mathfxns.html
I was assuming that you wanted to be able to plot a curve from tabulated data, in which case excel or any equivalent is likely your simplest solution.
RE: Fitting a curve to pump data
The advantage to using an equation is that it makes (in my mind) the Excel logic easier towards manipulating curves using affinity laws and determining intersections with system head curves.
Surprisingly, the best curve fitting program I have ever used is an old DOS Shareware program called XYMATH, although I use CurveExpert32 now and that seems OK for most of my needs. I haven't played with Excel's built-in curve fitting much, but based on what I've seen to date, I prefer the two mentioned above. Both are "free" off the internet.
Regards,
SNORGY.
RE: Fitting a curve to pump data
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Fitting a curve to pump data
BigInch: Yes it is centrifugal. The problem I have had with second order is that it typically does not go flat at the shut-off head as the curve should.
RE: Fitting a curve to pump data
How bad do you need a stand-alone$
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/