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5
Strainer
The pump has to be protected from foreign matter, such
as weld slag, pipe scale, etc., that could enter the pump
via the suction line. If the cleanliness of the system
cannot be guaranteed, a strainer must be installed in
the inlet pipe near the pump. For practical reasons a
suction strainer with 0.5 0.8 mm mesh openings is
recommended:
The size of the strainer should be selected so that it is
large enough to allow adequate pressure at the pump
inlet. The pressure drop across the strainer should
preferably not exceed 0.1 bar at max. flow rate and nor
mal operating viscosity. A vacuum gauge between the
strainer and the pump inlet is recommended to indicate
when the strainer needs cleaning.
Liquid trap
In some mounting arrangements the pump may not
retain the liquid at stand still. In such installations the
suction pipe should be arranged so it forms a liquid trap
together with the pump, keeping the pump half filled
with liquid. See fig. 7.
Fig. 6 Strainer
Fig. 7 Liquid trap
