# How to find Best Efficiency Point for pumps in series?

• theone
In summary, the system curve and pump performance curve intersect at the operating point for a single pump. When pumps are in series, the system curve remains the same and the pump curve is superimposed on it. To determine the performance of multiple pumps in series, use the equation provided in the article http://www.engineeringtoolbox.com/pumps-parallel-serial-d_636.html. To estimate the pump run out Qmax and maximum efficiency, use the pump curve function which requires these values.

## Homework Statement

that this is where the system curve and the pump performance curve intersect.

But if the situation involves pumps in series, what will the system curve be a plot of? Is it flow rate and the total pump head?

theone said:

## Homework Statement

that this is where the system curve and the pump performance curve intersect.

But if the situation involves pumps in series, what will the system curve be a plot of? Is it flow rate and the total pump head?

## The Attempt at a Solution

The system curve is derived from totaling up all of the friction losses in the piping and fittings for different flow rates. It's going to be the same regardless of how many pumps there are. The pump curve is superimposed on the system curve to determine the operating point for the piping system.

If you know the performance of an individual pump, performance for multiple pumps in parallel or in series can be determined according to this article:

http://www.engineeringtoolbox.com/pumps-parallel-serial-d_636.html

SteamKing said:
The system curve is derived from totaling up all of the friction losses in the piping and fittings for different flow rates. It's going to be the same regardless of how many pumps there are. The pump curve is superimposed on the system curve to determine the operating point for the piping system.

If you know the performance of an individual pump, performance for multiple pumps in parallel or in series can be determined according to this article:

http://www.engineeringtoolbox.com/pumps-parallel-serial-d_636.html

thanks. Also, is there a way for me to estimate the pump run out Qmax and the maximum efficiency.The function I have for the pump curve requires these values