Series MNKA,
acc. to ASME
Page 12
9250-050-en
Revision 11
TM 7903
Edition 07/2010
5.4.6 Venting and draining
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 (casing) is fitted with a drain
connection as a standard feature. Optionally, the drain
bore can be drilled. See
Figure 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
Temperature monitors
Rolling bearing monitors
Can 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.
Care must be taken when selecting the motor size to
ensure that the excess power is not too great, but
meet requirements acc. to ANSI/HI respec. ISO 5199.
During start-up the magnetic drive could otherwise
stop.
The magnetic drive rating at the nominal speed of
3500 rpm is given in the pump data sheet.
If the motor power exceeds this rating, it is necessary
to check the stoppage of the magnetic drive.
The same also applies if the required drive rating
exceeds 80 % of the magnetic drive rating.
Consult Richter if necessary.
Different operating data can be achieved without
changing the pump through the use of different
speeds, e.g. by means of a frequency converter.
The pump with base plate and motor is illustrated in
the
installation drawing
.
The
operating manual of the motor manufacturer
must be observed.
A motor with a valid ATEX certificate is to be
used if employed in zone 1 and 2.
