ISM0210 Instruction Manual of series SCE- Rev.03
Pag. 13/33
if the suction tube was larger than the suction flange, you will use an eccentric reduction, in order to prevent
formation of air and turbulence;
if there is a possibility that the maximum working pressure can be overcome, for example due to excessive
suction pressure, you should take appropriate measures by including a safety valve in the pipe;
Avoid using quick-closing valves, because sudden changes of pressure cause water hammer very dangerous for
the pump and the pipes;
Before installing the pump, make sure the suction line is clean and/or provided with a filter to protect the
impeller and the stationary bearings from damages incurred by slag, or other foreign particles , especially when
you start the installation for the first time.
Electrical connections:
DANGER
The pump is provided with or without electric motor: only qualified personnel
should carry out mechanical connection of the pump to the motor (for the model without
motor) and the electrical connections of the motor to the electrical system. Please read
carefully the instructions of the manufacturer of the motor or the manual before you
complete the installation.
Make sure that the motor doesn’t start during maintenance jobs.
Checks for the proper operation
We recommend installing a pressure gauge on both inlet and outlet pipes to allow the operator to easily control
the proper pump functioning in relation to the required operating point: in case of cavitation or other
malfunctions, there will be obvious pressure fluctuations.
Check the differential pressure of the pump between the suction and discharge connections to verify that it works
in the point of work provided.
Check that the absolute pressure at suction is not so low to cause the cavitation.
CAUTION
The absolute pressure at pump suction (m) must be at least 0,5 to 1 m, the vapour
pressure of the pumped liquid, in order to avoid cavitation.
Cavitation should always be avoided as it is very dangerous for the structure of the pump.
Do not dry run the pump!
Commissioning and operator training
−
Fully open the inlet valve and fill the pump and suction line;
−
Ensure there are no obstacles to the free rotation of the pump impeller.
The
M PUMPS PROCESS
series SCE are not reversible so the rotation
cannot be reversed.
The proper direction is clockwise.
If you put in front of the pump casing, an arrow indicates the correct
direction of rotation; to reverse the direction of rotation may cause
damages to the pump.
To control the direction of rotation, give and immediately remove
voltage, then observe the direction of rotation.
ROTATION SENSE:
Make sure that rotating parts, such as flexible coupling or other related organs, are always protected when the
pump is running.
Operators using the pump must have read this manual in the sections committed to the functioning, use and
maintenance, as well as being qualified to fully understand the features and to be able to identify the problems of
the pump.
