# CheCalc

Chemical engineering calculations to assist process, plant operation and maintenance engineers.

## Pump Operation Series & Parallel

Determine change in pump head vs flow curve when two similar pumps are operating in either series or parallel configuration.
Pump Curve
m³/h m

Pump System

m
mm
Bar A
mm
m
Bar A
mm
m
Result
##### Pump in Series

In series arrangement, each pump handles same flow rate, but the total head produced by the combination of pumps will be additive. Since each pump generates a head H corresponding to a flow Q, when connected in series, the total head developed is Ht = H1 + H2, where H1, H2 are the heads developed by the pump in series at the common flow rate Q.

##### Pump in Parallel

With pumps in parallel, the flow rates are additive with a common head. The flowrate Qt is split between the inlet into Q1 and Q2. Each pump develops the same head H at the corresponding capacity. Thus, the first pump at capacity Q1 develops the same head H as the second pump at capacity Q2.

The efficiency curve of two or more identical pumps in series or parallel will be the same as each individual pump.

##### Pump Head vs Flow Curve

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