OPERATION
28
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 (0 psi) 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 (116 psi). The triangular area
between the 0 kPa (0 psi) and the 800 kPa (116 psi)
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 (104 °F).
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.
