Duty Of Pumps
Pumps are required to displace fluids within a system of piping against the respective total friction head of the pipe system.
Typical example: The forced circulating system, e.g. of a central heating installation.
In the case of different liquid levels between system inlet and outlet the additional static head must also be overcome.
Typical example: Water displacement to a higher level i.e. to fill and maintain a near constant level in a header tank
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