n fit a filter insert (mesh width 100–400 μm depending on the feed
chemical and type of metering pump) for example.
n Always connect the suction line somewhat above the tank base or any
sediment accumulated.
n With feed chemicals containing impurities or sediment, suspend the
foot valve at a sufficient distance above the tank base or any sediment
that has accumulated - see Fig. 6.
n Preferably route the suction line with a falling rather than a rising gra‐
dient to prevent the priming of air bubbles.
n Install the pump with the feed on the suction side.
n Install a foot valve at the end of the suction line, in case the pump is
higher than the maximum fluid level in the storage tank.
n Only shorten the free end of the suction line until the foot valve is sus‐
pended just above the container base.
n With high storage tanks without a connecting option at the tank base,
prime using a siphon line.
Install a filling device (
Fig. 10) or siphon vessel (Fig. 11) for the siphon
line (suction line).
With dirt or impurities in the feed chemical,
Fig. 7
With slightly gaseous feed chemicals
(hydrogen peroxide, sodium-calcium hypo‐
chlorite ...)
Fig. 8
Avoid allowing the suction line to run dry.
Fig. 9
Prime without connecting options at the
tank base
Fig. 10
Installation, hydraulic
12
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