Watson-Marlow APEX10 - Manual (Page 28)

OPERATION
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7.3 Performance graphs
Useful operating duties can be found in the
performance graphs in which discharge-pressure
curves are displayed in a speed-power diagram.
Even at 0 kPa discharge pressure a certain torque is
required to let the pump rotor rotate. The pump and
hose are designed to handle a discharge pressure up to
800 kPa. The triangular area between the 0 kPa and the
800 kPa lines describes the allowed performance area.
The required duty points have to fall within this area.
In the direction of higher speeds and powers, pump
operation is limited by the heat generated, the product
temperature and the ambient temperature. Product-
temperature lines determine a distinction between
areas of continuous operation and intermittent
operation in the graphs. The graphs apply for a
maximum ambient temperature of 40 °C.
If the duty for an application is specified in the area of
intermittent operation, let the pump stand still to cool
down for at least one hour after three hours of
operation.