2.1 Choice of pump
To obtain the service expected from a MOUVEX P BI
series pump, regarding both performance and longevity,
it is vital that the type of pump, its speed and the mate-
rials used for its construction are determined as a func-
tion of the pump output, its installation and operating
conditions.
You can contact our Technical Services at any time to
ask for the information you require.
2.2 Hoisting devices
Hoisting points :
2.3 Pipe diameter
In order to achieve the best usage conditions, it is impor-
tant to take the following recommendations into account
when it comes to pipe dimensions :
• The pipe diameter should be chosen as a function of
pipe length and the flow rate and viscosity of the pum-
ped liquid, so that any head loss remains within the per-
missible limits for the motor/pump unit. Therefore it is
difficult to give general and precise directions. However,
it is never a disadvantage to over-dimension pipe dia-
meters, especially for the section on the inlet side.
• In the case of thin liquids and the piping on the dischar-
ge side, one can generally allow a diameter equal to
that of the ports on the pump and a larger diameter for
the piping on the inlet side, if the value for the inlet
power of the pump is negative or especially high.
• In the case of viscous liquids, special care should be
given to choosing pipe diameters. In fact, the variation
in head loss is proportional to viscosity and inversely
proportional to the diameter as power of 4. A slight
reduction in the pipe diameter could have serious
consequences for the operating conditions of the pump.
Our Technical Services are always available to provide
you with precise data if you give them accurate informa-
tion or, better still, the installation plans.
2.4 Piping assembly
In order to achieve the best usage conditions, it is impor-
tant to take the following recommendations into account
when it comes to fitting pipes :
• The location of the pump in the transfer or recycling cir-
cuit should always be determined so as to reduce the
height and length of the piping as much as possible.
• Wherever possible, siphons and reverse slopes should
be avoided in the inlet piping.
• Particular care needs to be taken with the sealing on
the inlet side to prevent air entering.
• Pipe elbows must always have a large radius (more
than 3 times the diameter of the pipes) and must not be
mounted too close to the pump flanges (min. recom-
mended distance : 10 times the diameter of the pipes),
on both the inlet and discharge sides.
• The pipes are supported and aligned with the pump in
such a way as to avoid putting stress on the pump
flanges. Non-compliance with this instruction can lead
to deformation of pump parts, misalignment of bea-
rings and accelerated material wear, even causing
parts to break.
• For ease of adjustment and checking, it is recommen-
ded that pressure tapping ports for pressure
gauges/vacuum gauges be provided as close as pos-
sible to the pump’s inlet ports (preferably, at a distance
of less than 5 times the diameter of the piping).
• If the suction head is especially high or if you want to
prevent the pipes emptying at shutdown, you can ins-
tall a foot valve. It should have a large diameter so as
not to generate additional head loss.
• We recommend placing valves as close as possible to
the pump ports to avoid having to drain the entire sys-
tem each time maintenance is carried out. These
valves should have the same diameter as the pipes
and preferably by full bore models.
• All these steps should be taken to prevent foreign
bodies entering the pump (the use of a filter in the
pump inlet pipe is strongly recommended).
• Before installing new pipes or tanks, be sure to clean
them very carefully to remove any solder, rust, etc.
which could be carried along with the water and cause
excessive pump wear.
• The pipes should be designed to allow for thermal
expansion/contraction (the use of flexible hoses or
expansion loops is recommended).
• If the liquid may freeze or solidify, prepare for draining
the piping by installing drain taps at the low points and
air vents at the high points.
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NT 1008-D00 08 18 P BI series e
2. INSTALLATION