Richter RMA-B Series (ASME) - Manual (Page 12)

Series RMA-B close-coupled design Page 12
9475-055-en Revision 14
TM 8256 Edition 06/2011
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. 3
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.
See Fig. 4.
Fig. 4
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. 5
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
You can obtain the publications "Safe Operation of
Magnetic Drive Pumps" and "The Operation of
Centrifugal Pumps without NPSH Problems" on
request.