caprari PM Serie Instrucciones De Servicio página 16

PM
5.2 Plant features
Make sure that:
- the suction pressure of the pump port is sufficient to meet the required NPSH conditions (consult the specific technical documentation);
- when pumping from an accumulation tank, the minimum dynamic level of the water is sufficient to prevent the formation of a vortex
(minimum suggested submersion 0.5 m).
Make sure that the delivery pipe is equipped with:
- a quick closing check valve, to protect the pump from water hammers;
- an on-off sluice valve to regulate the operating flow rate;
GB
- a pressure gauge.
Make sure that the suction pipe:
- does not allow air pockets to form;
- does not cause excessive suction head losses;
- is equipped with a foot valve to enable priming if the pump is installed above the water level (consult paragraph 6.1 "Starting").
Also make sure that:
- ventilation is sufficient to prevent the surrounding air from increasing in temperature if the unit is installed in a closed place, since this would be
harmful for the motor;
- the unit is installed so that it can be easily inspected;
- the unit is equipped with an elastic transmission coupling;
- the unit has a clutch, if a flexible combustion engine is mounted;
- that the pump is connected to the pipes by means of vibration damping compensators if the noise level of the system must be lowered;
- that the pump and pipes are protected from freezing if low temperatures are expected. Failing this, the water should be entirely emptied from
the unit (consult chapter 4 "Storage and handling").
- when pumping hot liquids, the pump and piping surfaces which can get heated to temperatures exceeding the limits indicated in EN 563 and
EN 809 (first reference 80°C) are adequately protected by means of guards to prevent scalding of the skin by contact.
ATTENTION The pipes must be supported near the pump casing since the casing must absolutely not act as a load bearing point.
Forces (F) and moments (M) transmitted by the pipes owing, for example, to heat expansion, the actual weight of the unit,
misalignments, lack of expansion joints, may act together on the suction and delivery ports but must in no case exceed the
maximum tolerated values given in the "Operating limits" table in chapter 10 "Technical data".
5.3 Mechanical connections
Pump and motor assembly
the base, to which the pump and motor must be rigidly fixed, must be appropriately sized according to the weight of the unit and the operating
stress it must sustain.
When a base complete with flexible transmission coupling (BGAM) is purchased from Caprari, the characteristics dimensions will be given in
chapter 10 "Technical data". The first figure of the serial number (eg. BGAM 35/DC -> Base N° 35 with coupling type D and type C protection) will
be given as reference. Comply with the following operations when assembling (consult chapter 4 "Storage and handling" when handling the various
components):
1) thoroughly clean the coupling surfaces;
2) fix the pump to the base by means of the appropriate anchoring points;
3) mount the two half-couplings (pump side and motor side) on the relative ends of the shaft, making sure that all the rubber inserts are
installed;
4) position the motor on the base;
5) coupling the two half-couplings and make sure that there is a 3÷4 mm gap between the two opposing faces;
6) measure the angular play between the two half-couplings and note this down, making indelible reference marks on the side surface to allow
further checks for wear;
7) make sure that the pump and motor are perfectly aligned both by examining this visually and with a straightedge placed on the coupling in at
least two points at a 90° angle to each other;
8) adjust any misalignments with shims under the supporting feet if necessary;
9) definitively fix the unit to the base;
10) mount the protective guarding on the drive transmission and any other protection required in order to comply with
the safety provisions.
Installing the unit on the foundation
The unit must be firmly fixed to a stable and robust bearing surface by means of the appropriate anchoring holes.
To prevent bending stress from being transmitted to the base, recover any misalignments between the anchoring points and the bearing surface with
shims.
Cement the entire base if possible. This will ensure better operating conditions in terms of vibrations and noise.
ATTENTION After having installed the unit on the base, make sure the pump and motor are perfectly aligned as described in this paragraph,
points 7, 8 and 10.
5.4 Hydraulic connections
Connection to the suction and delivery ports is carried out by means of flanges with standard holes, gasket and bolting.
ATTENTION After having connected all the pipes, make sure that the pump and motor are perfectly aligned as described in paragraph 5.3
"Mechanical connections", points 7 and 8.
1 6 Caprari S.p.A.