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ELETTROPOMPE
5.
Installation
5.1
Preliminary verifications
– Verify that the data shown on the plate, and in particular, power, frequency, voltage, absorbed current, are compatible
with the characteristics of the electric line or current generator available. In particular, the voltage of the line voltage
can have a variance of ± 5% from the nominal voltage value on the plate.
– TM series of pumps: the useful output power provided by the engine must be above the power absorbed by the
pump.
– Verify that the protection and insulation grade indicated on the plate are compatible with the environmental conditions.
– Verify that the chemical/physical characteristics of the liquid to be moved correspond to those specified on the order.
– Verify the environmental conditions: SAER pumps can be installed in enclosed or, at any rate, protected areas, with
maximum ambient temperature of + 40 °C in a non-explosive atmosphere.
– Verify that the electrical system corresponds to the CEI EN 60204-1 standard and, in particular: the existence of
an earth connection, the presence of a lockable disconnecting switch to isolate the motor in the event of malfunction
or small maintenance interventions and the presence of an emergency stop button.
– Verify that the pump's flow rate and head correspond to the required characteristics.
– Make sure that the pump's support surface is solid and even (so that it rests on all the feet) and that the load capacity
of the surface is adequate for the weight shown on the plate.
– Check that the strength of the concrete foundations is appropriate and complies with current relevant regulations.
– Verify that the surrounding area is sufficient for ventilation and allows movement in the case of maintenance.
5.2
Attach the pump/electropump to the ground
–
The pumps in the TM series can be connected to electric, Diesel, hydraulic engines or turbines by means of a
base and an elastic joint.
–
The pump/electropump must be installed as close as possible to the suction point of the liquid.
–
The foundation bolts must be inserted in the base and uniformly tightened.
–
For series TM and TMZ pumps, after having attached the base:
= Check the horizontal alignment of the unit with a spirit level.
= it is necessary to carefully check the alignment of the pump axis with the axis of the motor and the distance
between the two flanges of the joint (fig.3). More precisely, with reference to the table below and according to the
diameter of the joint, it is necessary that alignment errors X and Y are less than the maximum allowable values
shown; the distance W between the two flanges falls within the indicated limits; moreover, when rotating the pump,
the distance W must be constant along the entire circumference. To make corrections, loosen the attachment
screws and shim with calibrated plates.
Always check the alignment of the pump shaft with the engine shaft after securing the base to the foundations,
even in the case ready-assembled electropump units are supplied (the TMZ series).
Only operate the unit if it is fitted with a lap plate that complies with UNI EN 953 standards.
5.3
Connecting the pipes
Before connecting the pipes to the relative openings, make sure that the rotating part of the pump turns freely
and is not hindered.
The following warnings must be observed for the correct operation of the pump and the system:
– The NPSH value available in the lifting system must always be greater than the NPSH value of the electropump in
order to avoid cavitation.
– The intake and delivery pipes must not transmit forces to the pumps/electropumps due to their own weight and/or
heat expansion, at the risk of possible liquid leaks or breaking the pump. For this reason, the pipes must be supported
by anchorages and expansion joints must be inserted in the appropriate positions.
– The intake pipe must always be perfectly air tight and not positioned horizontally, but must always rise towards the
pump (fig. 4a). On the other hand, in the case of operation under water head, the intake pipe must always slope
down towards the pump (fig. 4b). For this reason, any fitting cones 1 must be eccentric and oriented as shown in
the figure to avoid the formation of bubbles during priming or operation.
– It is a good idea to protect the pump by inserting a filter on the intake pipe; especially during the initial period of
operation, the pipes release slags capable of damaging the pump seals. The filter must have a mesh less than 2
mm and a free passage area of at least 3 times the section area of the pipe so as to avoid excessive losses of head.
– To adjust the flow rate, it is a good idea to install a shutter on the delivery pipe.
– If the difference in geodetic level exceeds 10 m, or the pipe has a length of over 50 m, it will be necessary to install
a non-return valve between the pump and the shutter to protect the pump from "water hammers."
– To achieve the good operation of the pump, we recommend mounting a foot valve.
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