General Pump KFZ Owner Manual - Manual (Page 14)

Page 14
GENERAL PUMP
A member of the Interpump Group
KFZ SERIES
In order to guarantee correct pump operation, it is important to plan periodical cleaning of the filter
depending on actual pump usage, water quality and real clogging conditions.
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 guarantee correct fluid speed; see diagram 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 applications, install an appropriately sized pulsation
dampener on the delivery line.
9.9 Internal Diameter of the Hose Line
To determine the internal diameter of the hose, please refer to the diagram below.
Suction Hose
With a flow rate of ~45 GPM (170 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 ~ 3.15 inch (80 mm).
Delivery Hose
With a flow rate of ~45 GPM (170 l/mn) and water speed of 5.5 m/sec. The diagram line that connects the two
scales intersects the central scale, indicating the diameters at a value of ~ 1.2 inch (30 mm).
Optimum speed values:
• Suction: ≤ 0.5 m/sec.
• Delivery: ≤ 5.5 m/sec.