The maximum operating pressure depends on the pump size, pump material and
nominal pressure of the flange design.
Neither the material/size-dependent maximum pressure indicated in the data sheet
nor the maximum nominal flange pressure must be exceeded.
6.2.2 Hydraulic operating range
CAUTION
Non-compliance with hydraulic operating limits
Damage to the pump and motor
▷ Observe the limits in the data sheet.
▷ Brief passage through the critical range below Q
min
is permissible during start-
up.
General information on the hydraulic operating range
Fig. 21:
Pump operating range
NPSH
Available
Inlet pressure available in
the system
NPSH
Required
Required inlet pressure
A Operating limit B Operating point
C Operating range without
NPSH margin
The flow rate Q will develop automatically as a function of the discharge head H, in
line with the pump's characteristic curve. The pump's permissible operating range has
limits that are independent of each other in terms of their cause.
Low flow operating limit
This limit is indicated in the H/Q characteristic by Q
min
or by discontinuation of the
characteristic curve in the diagram.
NPSH-related limits under off-design conditions
The low flow and overload limits are determined by the ratio of NPSH
Required
to
NPSH
Available
.
The NPSH limits are determined as follows:
The intersections of NPSH
Required
and NPSH
Available
are projected onto the H/Q
characteristic, where they represent the operating limits.
If the pump set is operated outside its operating limits or system-related changes
occur, check the NPSH values.
If necessary, consult your nearest customer service centre.
6 Commissioning/Start-up/Shutdown
44 of 94
Omega / Omega V
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