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System curve

Dear all

I am perfoming a steady state simulation dor an 8 klm pipeline with  an inner diamter of 899 mm. The pump station contains 3 pumps (2 working+1 stand-by). The operating point of each pump is 500l/s and 26.8m.

After perfomring the system head curve analysis the following reuslts are generated:

The pump curve is a straight line and it is provided from the supplier.

My main issue is that the system is a straight line which is not similar to a typical system curve like the figure below:

Kindly ask you to give me your feed back.

Kind Regards