Richter MNK Series - Manual (Page 4)

Series MNK, MNK-B, external flushing Page 4
9230-060-en Revision 02
TM 6778 Edition 05/2007
4 Installation
4.1 Safety regulations
Equipment which is operated in potentially
explosive areas must satisfy the explosion
protection regulations.
People with a pacemaker are at risk from the
strong magnetic field of the magnetic drive. It
may be life-threatening for them to stay at a
distance of less than 500 mm from the pump.
The transition pipe is supplied pre-assembled.
If other feed lines have been ordered, they are sup-
plied dismantled to facilitate transport. They are then
re-assembled using the drawing provided.
It is recommended to install a flow monitor in
the flushing line. If the minimum flushing flow
is undershot, this sensor then triggers an
alarm or the motor is shut off.
5 Commissioning / Shutdown
The general commissioning/shutdown procedures
have already been described in the installation and
operating manuals of the pumps of the series MNK,
and MNK-B. They relate, for example, to work or in-
spections of the bearing pedestal, coupling and motor.
At this juncture the flushing procedure is described in
conjunction with the venting and filling of the pump.
5.1 Initial commissioning
Normally, the pumps have already been test-run with
water. Unless special agreements have been made,
there could still be residual amounts of water in the
pump. This must be noted in view of a possible reac-
tion with the process medium.
5.1.1 Minimum flushing pressure
Minimum flushing pressure required =
ps + (pD - pS)/2
pS = Pressure at the suction nozzle
pD = Pressure at the discharge nozzle
5.1.2 Max. flushing medium temperature
The owner of the plant must ensure that the working
temperature laid down is observed.
Table 1 and 3 below contains the admissible tem-
perature limits of the flushing medium as a function of
the temperature classes according to EN 13463-1.
Table 1 for series MNK
Temperature class acc.
to EN 13463-1
Limit value of the temperature of the flushing medium
Lining material PP PE-UHMW PFA/PTFE
Can material 4) CFK-F CFK-F CFK-F CFK-H CFK-Polyimid
T6 (85 °C)
T5 (100 °C)
not certified to ATEX
T4 (135 °C) 80 °C 1) 90 °C 1) 125 °C 1) 2) 125 °C 1) 2) 125 °C 1) 2)
T3 (200 °C) 80 °C 90 °C 150 °C 180 °C 180 °C 3)
T2 (300 °C) 80 °C 90 °C 150 °C 180 °C 180 °C 3)
T1 (450 °C) 80 °C 90 °C 150 °C 180 °C 180 °C 3)
1) Long life grease lubrication : no restriction.
Oil bath lubrication : standard version with shaft seal
T4 is valid during operation only up to and
including 50 Hz,
T3 more than 50 Hz
T4 labyrinth seal (special design)
2) The limit values specified for the temperature of the flushing
medium are determined for the most unfavourable case (high
speed, low flow, low heat capacity of the medium, ....). Under
favourable operating conditions the limit values specified may
be increased by up to 5 K after consultation with the
manufacturer.
3) Consult the manufacturer for higher temperatures of the
flushing medium.
4) The can material has been list in the data sheet.