EN-29
RDV - RGV - RCV
RBV - RNV - REV
VERTICAL PUMP
ENGLISH
6.3.2. FIXING OF PIPES
Discharge pipes have to be supported independently from the pump. Be sure that pipes are installed to allow the perfect
matching of flanges and counterflanges, avoiding stress transmission to the pump.
A compensation bellows is also necessary to absorb stresses or expansions caused by the temperature.
If compensation joints are installed, the pipes must be supported near the pump in such a way so it is not subjected to the
thrusts caused by the lengthening of the pipes.
6.3.3. SUCTION AND DISCHARGE PIPES
Discharge pipe’s diam shall never been smaller than pump’s discharge port. Its dimensions shall be defined according
to plant’s requirement (length- curves no etc. ). The pumped medium max speed shall be of 2,5m/sec.. A non returned
valve shall be fixed on the discharge pipe to protect the pump from excessive counter-pressure and opposite rotation
after each stop. If any, the suction pipe’s diam shall never been smaller than pump’s suction port. Its dimensions shall be
defined according to suction requirements, considering temperature product features and temperature. The suction port
or free suction inlet of the suction pipe shall be at a distance of min. 1,5 diam from the wall or the bottom of the tank to
avoid fluid’s vortex or air inlet. In case of air into the liquid, air sould be eliminated by bulkheads or similar. In case of air,
pump performances would be lower than
the data on the operating curve. Check the plant’s NPSHa value is higher than pump’s NPSHr value.
The following images show some examples of correct installation of the pump:
CORRECT INSTALLATION
ØDN
X
ØDN
Gate Valve
Non-return Valve
Expansion
Joint
X = 1.5 x ØDN
Y = 0.5 x ØDN
Strainer
(if necessary)
Y
6.3.4. FILTERS
In presence of a strainer or other filtration system before the suction port, check solids dimensions and/or other parts in
the tank are smaller than the filter’s holes. Suction net
surface of the filter needs to be 1.5 times biggher than suction’s DN. Check periodically the solids and/or other parts in the
tank do not clog the filter’s holes , affecting pump performances.
