SPXFLOW CombiFlexBloc Series, Instruction Manual

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18 Installation
CFB/EN (1808) 2.4
3.5 Piping
• The piping to the suction and delivery connections must fit exactly and must not be
subject to stress during operation.
• The passage of the suction pipe must be amply dimensioned. This pipe should be as
short as possible and run towards the pump in such a way that no air pockets can
arise. If this is not possible, a venting facility should be provided at the highest point of
the pipe.
• If the inside diameter of the suction pipe is larger than the suction connection of the
pump, an eccentric reducer should be applied to prevent air pockets and whirls. See
figure 2
• Sudden changes in the rate of flow can lead to high pressure impulses in the pump
and the piping (water shock). Therefore, do not use quick-acting closing devices,
valves etc.
3.6 Accessories
• Fit any parts that may have been supplied separately.
• If necessary, mount a foot valve at the bottom of the suction pipe. Combine this foot
valve with a suction strainer to prevent impurities from being drawn in.
• When mounting, place temporarily (for the first 24 operating hours) a fine gauze
between suction flange and suction pipe to prevent internal pump parts from being
damaged by foreign matter. If the risk of damage continues to exist, fit a permanent
filter.
• In case the pump is provided with an isolation, special attention has to be paid To
temperature limits of shaft seal and bearing.
3.7 Connecting the electric motor

The electric motor must be connected to the mains by an approved
electrician, according to the locally prevailing regulations of the electricity
company.
• Refer to the instruction manual belonging to the electric motor.
• If possible, fit a working switch as close as possible to the pump.
Figure 2: Eccentric reducer to suction flange.