SPX Johnson Pump CombiPrime V, Инструкция по эксплуатации

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20 Installation
CV/EN (1009) 5.3
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 3.
• 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
• It is recommended to always mount a check valve and a shut-off valve in the suction
pipe, as close as possible to the pump. If there is no check valve, the pump can only
be started with closed delivery valve.
• In case of possible pre-pressure on the suction side, mount a shut-off valve in the
suction pipe.
• If necessary, fit 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 so as to prevent internal pump parts from
being damaged by foreign matter. If the risk of damage continues to exist, fit a
permanent filter.
• Fit any parts that may have been supplied separately.
Figure 3: Eccentric reducer to suction flange.