General Pump KEZ Owner Manual v.2 - Manual (Page 10)

9.8 Delivery Line
To obtain a correct delivery line, please comply with the
following installation instructions:
1. The internal diameter of the pump must allow to guar-
antee correct fluid speed; see digram in paragraph 9.9
2. The first section of the hose connected to the pump
must be flexible in order to isolate pump vibrations
from the rest of the system.
3. Use high pressure hoses and fittings that guarantee
wide safety margins in any working condition.
4. Install a safety valve on the delivery line.
5. Use pressure switches suitable for the pulsating loads
typical of plunger pumps.
6. In the design phase, take into proper account the
pressure drop along the line, since this causes a
reduction in usage pressure with respect to the value
measured at the pump.
7. If the pump pulsations are harmful for particular appli
cations, install an appropriately sized pulsation damp
ener on the delivery line.
9.9 Internal Diameter of the Hose Line
To determine the internal diameter of the hose, please
refer to the following diagram.
Suction Hose
With a flow rate of ~24 GPM (91 l/mn) and water speed of
0.5 m/sec. the diagram line that connects the two scales
intersects the central scale, indicating the diameters, at a
value of ~ 62 mm (2.4 inch).
Delivery Hose
With a flow rate of ~24 GPM (91 l/mn) and water speed of
5 m/sec. The diagram line that connects the two scales
intersects the central scale, indicating the diameters at a
value of ~ 19.5 mm (.77 inch).
Optimum speed values:
• Suction: ≤ 0.5 m/sec.
• Delivery: ≤ 5 m/sec.
Page 10
GENERAL PUMP
A member of the Interpump Group
KEZ SERIES
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.
Ref 300665 Rev.C
07-13