salmson MUV Instalacion Y Puesta En Servicio página 10

ENGLISH
6.4 Starting up
Depending on conveyed fluid and running of pump, surface
temperature can exceed 68°C. Take necessary means to
avoid injuries.
The pump must not operate at zero flow (closed
C UTION !
discharge valve) for more than 10 minutes with cold
water (T° C < 40° C) and more than 5 minutes above 60° C.
We recommend to ensure a minimum flow of about 10 % of the nomi-
nal flow of the pump to avoid the formation of a vapour lock at the
top of the pump.
- Keep the discharge valve closed.
- Start the pump.
- Open draining plug to drain air. If no water leaks within 20', close the
plug and stop the pump, then wait 20' to allow air to settle.
- Start again the pump.
- If necessary (particularly if the suction height exceeds 5 m) repeat
these operations.
- If water leaks at draining plug (it means the pump delivers its pres-
sure), slowly open the discharge valve. The pump has to be primed.
- Check pressure stability at discharge with a manometer, if instabili-
ty, perfect air draining.
- In case of failure, do the filling in again and start the operation
again.
- To perfect air draining, close the discharge valve and the draining
plug, then stop the pump 20', start the pump again and open the
draining plug. Do it as long as air comes out.
- Open the discharge valve in order to have the wished working
point.
- Check that the current input does not exceed the value indicated
on the motor data plate.
7. M INTEN NCE
C UTION ! Before any operation, switch off the pump(s).
No special maintenance in operation.
Keep the pump and the motor perfectly clean.
In case of prolonged stopping, if there is no risk of frost, it is best not to
drain the pump.
The bearing holding the coupling is lubricated for its total lifetime and
does not require any lubrication.
Motor : The bearings are lubricated for their lifetime and do not requi-
re any lubrication.
Mechanical seals
The mechanical seal does not require any maintenance in opera-
tion. It must never operate dry.
Replacement frequencies
The replacement frequency of the mechanical seal depends on the
operating conditions of the pump :
- Temperature and pressure of the conveyed fluid for the mechanical
seal.
- Starting frequency : continuous or intermittent running.
The replacement frequency of the other components depends on
the operating conditions of the pump like load and ambient tempe-
rature.
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