Series MNK-B,
size 25-25-100
Page 11
9230-056-en
Revision 14
TM 9542
Edition 06/2016
5.4.3 Suction line
The suction lines must always be laid on a rising
gradient towards the pump. Otherwise, gas bubbles
may form which considerably reduce the suction line
cross section. Eccentric transition elements must be
installed between different pipe diameters.
Valves which disrupt the course of flow should not be
installed directly upstream of the pump.
Fig. 2
5.4.4 Supply lines
Supply lines should vent towards the reservoir and are
therefore to be laid with a constant downward gradient
towards the pump. Should the piping internals
upstream of the pump be horizontal, a low point can,
of course, be located upstream of these internals.
From here the pipe is then laid with an upward
gradient to the pump so that the gas bubbles which
form here can escape through the pump.
Valves which disrupt the course of flow should not be
installed directly upstream of the pump.
5.4.5 Discharge line
Do not arrange the shut-off valve directly above the
pump but initially provide a transition section.
The discharge nozzle velocity of the medium can
– if
necessary
– be reduced.
5.4.6 Venting and evacuating
Venting can take place into the discharge line or
upstream of the discharge valve.
A venting line can also be used as a bypass, drain or
flushing line.
The pump housing is fitted with a drain connection as
a standard feature. Optionally, the drain bore can be
drilled.
Fig.3
5.5 Pipe fittings
The following pipe fittings are available from Richter
on request:
Shut-off valves
Check valves
Sight glasses
Priming vessels
Strainers
Pressure gauges
Fig. 4
5.6 Monitoring facilities
Appropriate monitoring facilities are to be
recommended,
depending
on
the
requirements placed on operational safety and
availability of the unit.
Richter provides information on request and can
supply:
Flow meters
Filling level indicators
Motor load monitors
Leak monitors
You can obtain the publications "Safe Operation of
Magnetic Drive Pumps" and "The Operation of
Centrifugal Pumps without NPSH Problems" on
request.
5.7 Drive
The power consumption of the pump at the operating
design point is specified in the data sheet and works
certificate. If the operating design point was not known
when the pump was dispatched, the power
consumption can be read off the appropriate
performance curves. The max. density, the max.
viscosity and a safety margin are to be allowed for.
