General Pump HF Owner Manual - Manual (Page 9)

GENERAL PUMP
A member of the Interpump Group
HF SERIES
9.7 Internal Diameter of Piping
To determine the internal diameter of the piping, follow the following diagram.
Example 1 ( )
With a flow of 150 l/min and a water speed of 0.45 m/sec, the diagram line joining the 2 scales intersects the
central scale, indicating the diameters, at a value of 80 mm.
Example 2 ( )
With a flow of 70 l/min and a water speed 5.5 m/sec. The diagram line joining the 2 scales intersects the
central scale, indicating the diameters, at a value of 16 mm.
Optimal speeds:
- suction: 0.5 m/sec.
- delivery: 5 m/sec.
The diagram does not take into consideration the pipe and valve resistance, drop in pressure due to the pipe length
the viscosity of the pumped fluid, its temperature, etc.
If necessary, contact our technical department.
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