EBARA 3SF Instrucciones Para El Uso página 9

6.1 INTENDED USES
Refer to PART 2 of the use and maintenance manual
supplied with this manual.
6.2 NON-INTENDED USES
Do not use flammable fluids
Refer to PART 2 of the use and maintenance manual
supplied with this manual.
In particular, do not use the pump to handle flammable liquids.
6.3 ASSEMBLY/DISASSEMBLY
Refer to PART 1 and PART 2 of the use and maintenance
manual supplied with this manual.
6.4 PRECAUTIONS TO AVOID EXCESSIVE
VIBRATIONS
Excessive vibrations can result in excessive wear of the
pump components and/or their premature breaking.
To avoid excessive vibrations:
- always fix the pump to the support surface through the
dedicated holes on the pump body (3SF-3LSF models)
or on the base (3PF-3LPF models).
- Do not operate the pump faster than that indicated on the
plate. Check that the rotation speed indicated on the plate
corresponds to the rated speed of the motor. Make sure
that the motor is never powered at frequencies higher
than 60Hz.
6.5 PRECAUTIONS TO AVOID MISALIGNMENT OF
THE MOVING PARTS
To avoid misalignments of the moving parts during installation
and during the life of the pump, follow the instructions
given in PART 2 of the use and maintenance manual in
the "INSTALLATION" paragraph.
6.6 PRECAUTIONS TO AVOID DRY OPERATION
AND BREAKAGES OF THE MECHANICAL SEAL
It is the responsibility of the user or installer
to ensure that the pump does not run dry.
The level control devices used must comply
with the EN 80079-37 standard.
To avoid possible overheating of the mechanical seal and
consequent breakage, make sure that it is always lubricated
during its operation.
During normal operation, the mechanical seal is lubricated by
the pumped fluid and the heat generated by it is dissipated
by the fluid itself. Therefore, a decrease in the level of the
fluid inside the pump must be avoided and, even more so,
anomalous functioning such as dry running, by applying
safety devices.
These safety devices, in compliance with the essential
requirements of the European Directive 2014/34/EU, must
be covered by a certificate and correctly chosen in the way
of protection against explosion.
For example, devices suitable for this purpose are
manufactured by the company Endress Hauser.
FIGURES 2 and 3 illustrate how to fit level control devices.
FIGURE 2 shows a sensor of the tuning fork type, while
FIGURE 3 shows a sensor of the conductive type.
To install the level sensor and its control unit, consult the
manufacturer's manual. The control unit must be set so that
the power supply to the pump is automatically suspended
in the event of the absence of fluid. Furthermore, in
accordance with the ATEX regulations, the power supply
must not restart automatically, but a manual verification
and reset intervention are required.
To ensure correct operation of the level control device,
checks must be made at regular intervals. These checks
must be able to detect any sensor malfunctions. Consult
the manufacturer's manual.
6.7 PUMP OPERATING WITH DELIVERY VALVE
CLOGGED/CLOSED
It is the responsibility of the user or installer
to ensure that the pump does not work
with the delivery valve clogged or closed,
or with a flow rate lower than the minimum
flow rate required to avoid overheating. The
control devices used must comply with the
EN 80079-37 standard.
To avoid overheating, the flow rate delivered by the pump
must always be greater than 10% of the flow rate of the
point of maximum efficiency. TAB.1 provides the minimum
flow rate required for each size of the 3SF-3LSF-3PF-3LPF
family of pumps. The values indicated guarantee compliance
with the temperature class.
Size
32-125
32-160
32-200
40-125
40-160
40- 200
50-125
50-160
50-200
65-125
65-160
65-200
65-250
80-160
80-200
80-250
TAB. 1. Minimum flow rate required
FIGURE 4 shows the assembly diagram of the flow meter
(Mp) which must be mounted on the outlet so that it blocks
the pump (P) when the flow falls below the minimum flow rate
Minimum flow rate
[litres/minute]
30
30
30
50
60
70
50
90
100
110
140
160
180
250
250
250
EN
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