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9
PUMP INSTALLATION
9.1
Installation
The pump must be fixed horizontally using the Ø19 drilled
support feet.
The base must be perfectly flat and rigid enough as not to
allow bending or misalignment on the pump coupling axis/
transmission due to torque transmitted during operation.
Two lifting eyebolts are mounted on the pump for easy
installation, as per the figure below.
The eyebolts are sized for lifting the pump only and
must never be used to handle additional loads.
Replace the oil filler closing plug located on the
casing with the oil filler cap.
The oil filler cap must always be reachable, even
when the unit is assembled.
Grounding: It is necessary to fix a grounding
cable to the pump by means of the M8 stainless
steel screw and the stainless steel toothed washer
properly marked by the YELLOW label. See "ATEX
EXPLOSION PROTECTION" manual.
The pump shaft (PTO) must not be rigidly
connected to the drive unit.
The following types of transmission are
recommended:
-
Flexible coupling.
-
Cardan shaft (comply with manufacturer's Max.
recommended working angles).
In all cases the transmission must be assembled
correctly to avoid incorrect or harsh operation of
the connection parts and to prevent excessive
wear, temperature rise and/or hazardous breakages
that may create potential sources of ignition and
explosion. See "ATEX EXPLOSION PROTECTION"
manual.
9.2
Rotation direction
The rotation direction is indicated by an arrow located near
the drive shaft.
From a position facing the pump head, the rotation direction
will be as in Fig. 6.
LH SIDE
anticlockwise
The drive can be taken from either side of the pump.
The pump is generally supplied with the PTO shank on the
right-hand side (see Fig. 6).
To have the drive on the left-hand side you need to remove
the shaft end cover and fit it on the right-hand side of the
pump (see par. 2.1.1 of the Repair manual).
On the contrary, the tab must be removed from the right-hand
side and inserted onto the shank on the left-hand side.
9.3
Hydraulic connections
In order to isolate the system from vibrations produced by
the pump, it is advisable to make the first section of the duct
adjacent to the pump (both suction and outlet) with flexible
piping. The suction hose must be sufficiently rigid to prevent
deformation due to the negative pressure exerted by the
action of the pump.
9.4
Pump supply
The LK pumps must always be installed with a suction head,
that is they must receive the water by gravity or by forced
feeding, but never draw it from a lower level.
The pumps are able to withstand minimum suction heads of
even 1 metre, however, for the best volumetric efficiency and
above all to avoid cavitation, the available positive suction
head (NPSH avail) measured at the suction flange in the head
must be equal to or greater than the values below.
LK36
LK40
NPSH
(m)
4
4.5
r
For the greater displacements, LK50 LK55 LK60 pumps, forced
feeding by a booster pump is highly recommended in order to
avoid cavitation, considering the geometry of the hydraulics
and the considerable flow rates.
The booster pump must have at least twice the flow rate of the
rated flow rate of the plunger pump and pressure of between
2 and 3 bar.
These supply conditions must be observed at all operating
speeds.
The booster pump must always be started up
before the plunger pump.
It is advisable to install a pressure switch on the
supply line downstream of the filters protecting
the pump.
35
RH SIDE
clockwise
Fig. 6
LK45
LK50
LK55
LK60
5.5
6.5
7.5
8
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