Combined H-Q curves, operating points, individual duties, shaft power, and stability check.
Single pump
73.6 m³/h
26.2 m head
7.0 kW
Parallel
92.8 m³/h
35.8 m head
+26% flow vs single
Series
35.0 m
91.3 m³/h flow
+33% head vs single
Filled circles = raw data points entered. Smooth curves = quadratic least-squares fit H = a + b·Q + c·Q². Series curve truncated at the shutoff flow of the pump with the lower Qshutoff.
| Config. | System Q (m³/h) | System H (m) | Pump A Q (m³/h) | Pump A Q (m³/h) | Total P (kW) | vs Single |
|---|---|---|---|---|---|---|
| Single | 73.6 | 26.2 | 73.6 | — | 7.0 | baseline |
| Parallel | 92.8 | 35.8 | 46.4 | 46.4 | 12.1 | +26% Q |
| Series | 91.3 | 35.0 | 91.3 | 91.3 | 11.6 | +33% H |
Parallel: both pumps see the same discharge head — they split the total flow. Series: both pumps handle the same flow — they each contribute part of the total head. Shaft power P = ρgQH/η. Uses entered pump efficiencies.
Parallel — more flow
Series — more head