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A bypass pipe, (a pipe from the discharge piping back to the source of liquid supply or
suction line), may be needed for your installation to ensure that the pump operation
is within the specified flow range. It is recommended that the connection of a bypass
pipe to the suction line be at least 24-inches (61 cm) away from the pump inlet.
3.9
Suction Screen (Strainer)
This is a precision multi-stage centrifugal pump with close tolerances to provide
maximum efficiency.
It is good practice to install a 30 mesh or finer screen (available as an accessory) or a
cartridge filter in the suction line to collect any foreign objects or large particles.
The pump must not be operated with restricted suction line (inlet) flow.
Positive gauge pressure must be maintained at the pump inlet (downstream from the
filter or screen). A clogged screen or filter will result in a greater pressure drop. A low
pressure alarm or shutoff switch located between the screen or filter and the pump
should always be used in conjunction with a suction line screen or filter.
3.10
Discharge Screen (Strainer)
A 30 mesh screen (available as an accessory) located in the discharge piping will
protect your process fluid should the pump be damaged due to improper operation
or other causes. The installation of the discharge screen is shown in Figure 3.5
(Installation of Discharge Screen).
Figure 3.5
Installation of Discharge Screen
11
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