General Pump MK Owner Manual - Manual (Page 12)

Page 12
GENERAL PUMP
A member of the Interpump Group
MK SERIES
The filter must be installed as close as possible to the
pump, should allow easy inspection and have the follow-
ing characteristics:
1. Minimum capacity 3 times greater than the pump’s
rated flow value.
2. Filter port diameters must not be smaller than the
pump inlet ports.
3. Filtration degree ranging between 200 and 360 µm.
9.7 Filtering
On the suction line, install two filters as indicated in fig. 7
and fig. 7/a.
With the manual adjustment valve:
With the pneumatic adjustment valve:
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 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 ~105 GPM (400 l/mn) and water speed
of 1 m/sec. the diagram line that connects the two scales
intersects the central scale, indicating the diameters, at a
value of ~ 3.5 inch (90 mm).
Delivery Hose
With a flow rate of ~105 GPM (400 l/mn) and water speed
of 5.5 m/sec. The diagram line that connects the two
scales intersects the central scale, indicating the diame-
ters at a value of ~ 1.6 inch (40 mm).
Optimum speed values:
• Suction: ≤ 1 m/sec.
• Delivery: ≤ 5.5 m/sec.
Ref 300669 Rev.B
05-13