# Creating pump curves and compressor curves in Seeq

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FAQ: How do I put a pump curve in Seeq? As of R21.0.44.00 this can be done the with the scatter-plot tool.  This method does require version R21.0.44.00 or newer to work.  See the steps below for details.

1. Determine the X&Y components of the curve. This can be done with a tool such as https://apps.automeris.io/wpd/
2. Enter or paste the components in columns A and B in the CurveFitter excel sheet. See screenshot below for details.  The CurveFitter file can be found here.  CurveFitter.zip

3. Once the new Flow and Head data has been pasted into excel copy the contents in from D2 to E9 and paste them into the Seeq formula tool. See screenshots below for copy paste details
Copy:

Paste:
4. Paste the following syntax in the same formula under the coefficients. Be sure that the flow signal has the variable name “\$flow”.

\$f=\$flow.remove(\$flow.isNotBetween(\$lower,\$upper)).setunits('')

\$coeff4*\$f^4+\$coeff3*\$f^3+\$coeff2*\$f^2+\$coeff1*\$f+\$const

Final formula view:
5. Add the line to the Scatterplot by selecting the f(x) in the Scatterplot tool bar and pick the correct item from the select item dropdown.

6. If adding more than one curve, then click on the item properties “i” of the first curve and click on duplicate. Once in the formula tool copy the new coefficients from excel replacing the old one and hit execute. Follow step 5 to add the curve to the plot.

Final View:

Edited by Teddy
• 4
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• 3 months later...

Hi,

Is there a way to display the performance of multiple pumps on the same curve?

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Yes there is a way to add multiple pumps to one curve.  It can be done by following these steps on the following Seeq.org post.

• 2

Thanks

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• 2 months later...

I tried but curves are taking higher ranges and appearing like a linear curves.

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If all of your points are in one location or you are only plotting one point you will likely need to zoom out to see the whole curve.   This can be done by putting your mouse over of the x and y axis and using the scroll wheel to zoom out.

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• 3 weeks later...

Its not the scale setting problem, But its is taking infinite limits.

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• 8 months later...

Would you mind sharing the password to the excel file so I can edit it?

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Alex,

I am not able to share the password of the excel file. The first two columns should be unlocked so you can add your curve data there.  If you want to change the fit, you can copy the formula to another workbook or write your own. You don’t need to use the excel workbook provided if you don’t want to. It is just setup to allow you to copy and paste the cells into the formula tool and not have to worry about anything. You can follow the same formatting I did and get the same results.

Note: If you do change the order of the fit you will need to change the formula syntax in Seeq to match the new order.

Regards,
Teddy

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Okay no problem. I can copy it and rewrite...asking for the password was the least effort option 😅 Thanks for sharing this.

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• 1 year later...

How did you set the x-axis and y-axis to be equal to Flow and Delta pressure? did you use a formula to get delta pressure values?