Brochure

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3. Pumps operating in systems
3. Pumps operating in systems
This chapter explains how pumps operate in a system and how they can be
regulated. The chapter also explains the energy index for small circulation
pumps.
A pump is always connected to a system where it must circulate or lift
fluid. The energy added to the fluid by the pump is partly lost as friction in
the pipe system or used to increase the head.
Implementing a pump into a system results in a common operating point.
If several pumps are combined in the same application, the pump curve for
the system can be found by adding up the pumps’ curves either serial or
parallel. Regulated pumps adjust to the system by changing the rotational
speed. The regulation of speed is especially used in heating systems where
the need for heat depends on the ambient temperature, and in water sup-
ply systems where the demand for water varies with the consumer opening
and closing the tap.