6
5.- MANIPULATION
For handling the equipment appropriate lifting and transport systems complying with
safety norms should be used.
6.-INSTALLATION
The site for placing the pump should be as close as possible to the liquid level, thus avoiding excessively
long suction piping. Its position must meet the criterium that NPSH
d
is higher than the NPSH
r
of the pump.
Provide a diameter assuring a liquid flow velocity not higher than 1.5 m/s for suction, and 3 m/s for
delivery. The pipe diameters must never be smaller than the pump connection ports
For suction piping should meet the following requisites:
•
The suction piping should be short, with as few bends as possible, any such bends to have a
wide curve radius, the last section before the pump must be straight.
•
The inlet cone must be eccentric when the pump works under depression. If it works under load
this cone can be concentric.
•
The piping should be upwards towards the pump, with a slope of at least 2%.
•
It must be properly sealed, preventing the admission of air.
•
When the pump has negative suction, in order to prime it, it should have a suitable foot valve
placed at the required depth (submergence) to prevent air intake through vortices forming.
For delivery piping must meet the following requisites:
•
Being
sealed.
•
Having the proper dimensions to avoid excessive head losses.
•
Having a delivery valve at the outlet of the pump.
•
Where necessary, a non-return valve should be installed between the pump and the delivery
valve as well as the appropriate devices tending to eliminate the harmful effects of any possible
water hammers.
TAKE CARE
the pipes should be held on supports close to the body of the pump so that they do not
transmit any stresses on the pump flanges.
WARNING:
Provide space around the pump for motor ventilation, to allow for checking of shaft rotation,
for filling and draining the pump and to allow for collection of the liquid to be removed
Make sure prolonged accidental leakage of liquid does not cause damage to persons or
property. Leakage may develop as a result of surge pressure or water hammer, erroneous
operations (such as failing to close a plug or valve) or other functional disorders.
Mount the pump on a flat horizontal surface (using a level gauge) such as a solid cement base or a rigid
supporting structure in metal. To ensure stability, insert, if necessary, small pieces of calibrated metal
plate next to the 4 anchoring screws.
Provide for the possibility of draining the pump without having to drain the entire system.
