General Pump KFM Owner Manual - Manual (Page 10)

Page 10
GENERAL PUMP
A member of the Interpump Group
KFM SERIES
9.7 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 digram in
paragraph 9.8.
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. Use pressure switches suitable for the pulsating loads
typical of plunger pumps.
5. 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.
9.8 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 ~30 GPM (113 l/mn) and bentonite
speed of 0.67 m/sec, the diagram line that connects the
two scales intersects the central scale, indicating the
diameters, at a value of ~ 2.4 inch (60 mm).
Delivery Hose
With a flow rate of ~30 GPM (113 l/mn) and bentonite
speed of 3.84 m/sec. The diagram line that connects the
two scales intersects the central scale, indicating the
diameters at a value of ~ 1 inch (25 mm).
Optimum speed values:
• Suction: ≤ 0.67 m/sec.
• Delivery: ≤ 3.84 m/sec.
The diagram does not take into account the hose
and valve resistance, the pressure drop due to the
pipe length, the viscosity and the temperature of
the pumped fluid. If necessary, contact our
Customer Service Department.