VERTICAL PUMP
RDV - RGV - RCV
RBV - RNV - REV
EN-36
7.7.
PUMP START
FORBIDDEN!
The pump must never run dry.
Maximum power allowed for direct start-up (for data not in the table, start with star-delta, soft-start or with inverter).
Poles / rpm
Power (kW)
2P / 3000 rpm
Up to 30
4P / 1500 rpm
Up to 15
6P / 1000 rpm
Up to 11
To start the pump, proceed as described:
STEP
ACTION
1
Open the suction valve slightly (20% opening).
2
Start the pump.
3
When the motor has reached full throttle, slowly open the discharge valve and adjust the operating point.
4
Check that the current absorbed at full speed does not exceed the rated current.
5
Check that the work head is not lower than the curve bottom.
Number of start-ups allowed:
Motor power (kW)
max no. start-ups per hour
Up to 7.5
15
Up to 30
12
Over 30
10
7.7.1. CHECKS AFTER START-UP
To check after start-up, proceed as described below:
STEP
ACTION
1
Check that the pump turns in the indicated rotation direction.
2
Check that there is no excessive noise or vibration indicating a malfunction
3
Check that there are no leaks from the connections between the flanges and pipes.
7.8.
STOP
If the system is equipped with non-return valves to stop the pump it is sufficient to stop the motor.
If the non-return valves are not present, stop the motor and close the discharge valve to prevent the reverse rotation of
the pump for a long time.
Subsequently and independently of the aforementioned conformation:
STEP
ACTION
1
Close the auxiliary liquid valves (if present).
2
In case of shutdown with temperatures that could freeze the flushing liquid, drain the flushing pipes.
For extended stops, see the paragraph "EXTENDED STOPS"
