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7.2 PIPE WORK
Pump connection flanges are plugged to avoid any contamination during
transport and storage. Protective covers should be removed only before
installing the pump in the piping. Remove dust before removing the
covers from pump flanges. Especially for new pipe work : clean
thoroughly piping before connecting it to the pump.
Remove protective covers
Add flange gaskets
Fasten suction pipe
Fasten discharge pipe
No stress must be applied to the pump casing by the pipe work. If
excessive, those forces and moments cause misalignment,
overheating of bearings, coupling wear, vibrations and possible failure or
explosion of pump casing.
After replacement of a pump or during connection of pipes to
pump flanges, never use pump flanges as a support to pull or push
the pipe works.
The axial displacement of expansion coupling (if installed) should be
limited. Use tie rods as recommended by the manufacturer.
Two designs are possible for the suction line : positive suction head and
suction lift operation.
Positive suction head operation :
Nominal diameter of the pipeline is often larger diameter than pump
suction flange. Unequal nominal diameter should be compensated by an
eccentric transition part. It is recommended to install a straight pipe
before the pump inlet (size L should be 2 to 3 times the pipe nominal
dimension). The suction line should be laid with a downward slope
toward the pump.
Discharge pipe :
Nominal diameter of discharge pipe should be chosen to ensure a max
flow speed of 3m/s.
Filter :
If required a filter can be installed before the pump intake. To ensure
proper working of pump the equivalent exchange surface of the strainer
should be 3 time the pipe sectional area.
Clogging level of filter should be checked regularly.
Valves :
It is advised to install isolating valves on suction and discharge side for
maintenance purpose. Those valves should be of large passage type and
could be locked in position.
Isolating valve on suction side should not be connected to pump suction
flange.
Non‐return valve :
A check valve can be installed on discharge side to protect the pump
from back flow effects such as pressure surges or back flow when pump
is stopped.
After pipe work is done turn pump shaft by hand and check it turns
freely. If it appears that it is difficult to turn pump shaft, then check
forces applied by piping to pump casing. Installation of piping should be
done again.
Location of connections :
Connections :
V = vent connection G1/8''
G = grease filling connection G1/8''
7.3 ELECTRICAL CONNECTION / EARTHING
drive to motor destruction if terminal strip are positioned in a wrong
way.
national and international regulations.
proper type and size of electric cable.
are usually indicated inside motor junction box). Sensors will be
connected in compliance with the instructions given in dedicated
instruction manual.
7.3.1
Multi‐voltage winding for voltages 230/400V and 400/690V :
6 wiring terminals :
To change motor direction of rotation reverse two phases on wiring
terminals. Connection of earthing terminal is mandatory.
7.3.2
Voltage : U
12
Check that motor winding corresponds to site electric power
supply characteristics before electrical connections are performed.
Connecting a 230/400V motor on a 400V power supply or
connection of a 400/690V motor on a 690V power supply might
Electrical connection should be performed by qualified personnel
only having necessary agreements and in compliance with local,
Equipments used in an ATEX zone will be connected in compliance
with CEI60079‐14. It is the responsibility of the end user to select
Respect motor manufacturer instructions to make electric motor
connection (refer to the instructions supplied with the motor. they
TERMINAL STRIP POSITIONNING FOR STAR
(Y) AND DELTA () CONNECTION (MULTI‐
VOLTAGES ELECTRIC MOTORS)
LOWER VOLTAGE : CONNECTION
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