7/11
NT 1006-C00 03 18 Centrex Multi 2 e
3.1 No return valve item 15 calibration
The No return valve item 15 is available with 2 values of
calibration to select when the order of the complete unit
is placed :
• 0,1 bar calibration : storage in an above ground tank
• 0,4 bar calibration : storage in an under ground tank
3.2 Pipe diameter
It is important to take the following recommendations :
Head loss :
• The pipe diameter is chosen as a function of its length,
the flow rate and the viscosity of the pumped product.
However, it is never a disadvantage to over-dimension
the inlet pipe diameters.
• Generally, the discharge pipe diameter(s) is a diameter
equal to the ports 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.
3.3 Piping assembly
It is important to take the following recommendations :
• The location of the pump in the circuit should always be
determined so as to reduce the height and length of the
piping as much as possible particularly when used for
suction.
• 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 flan-
ges. Non-compliance with this instruction can lead to
deformation of pump parts, misalignment of bearings
and accelerated material wear, even causing parts to
break.
• The CENTREX MULTI, Turbine version, is delivered with
the discharge piping module disconnected. That allows
to reduce the dimensions and in consequence to mini-
mize the packaging size. This module has to be connec-
ted (already tested in our workshop), please make sure
the pipe is properly supported in order to avoid any
vibrations creation as well tension on the unit.
• 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 val-
ves should have the same diameter as the pipes and
preferably by full bore models.
• 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.
3.4 Degassing
The gases caught by the gas separator are sent in the
discharge line
7
, downstream to the meter without distur-
bing the operation and the accuracy of the unit.
No connection is necessary.
3.5 Direction of rotation
The pump and unloading unit are not reversible. Ensure
that the motor is connected correctly according to the
pump's direction of rotation, indicated by arrows on the
body.
WARNING
OPERATION WITHOUT THE SHAFT
PROTECTOR CAN CAUSE SERIOUS
PERSONAL INJURY, MAJOR PROPER-
TY DAMAGE OR DEATH.
Do not operate
without guard
in place.
3. INSTALLATION
WARNING
FAILURE TO RELIEVE THE SYSTEM
PRESSURE PRIOR TO PERFORMING
ANY WORK ON THE PUMP OR THE
INSTALLATION CAN CAUSE PERSONAL
INJURY OR PROPERTY DAMAGE.
Hazardous pressure
can cause
personal injury
or property damage.
WARNING
SYSTEM FITTINGS AND HOSES MUST
BE CAPABLE OF WITHSTANDING
OPERATING PRESSURES.
Hazardous pressure
can cause
personal injury
or property damage.
