Richter MNK Series - Manual (Page 6)

Series MNK, MNK-B, external flushing Page 6
9230-060-en Revision 02
TM 6778 Edition 05/2007
They guarantee a temperature rise in the flushing flow
of < 10 K. If flushing media with a different heat ca-
pacity are used, the temperature rise must be recalcu-
lated using the following formulas.
O t temperature, increase of the flushing medium[K]
Q
flushing quantity [l/h]
n pump speed [rpm]
c specific heat of the flushing medium
K x kg
J
Group 1.1
Ot =
c x Q
4187 x 85 x
1500
n
2
Group 1.2
Ot =
c x Q
4187 x 130 x
1500
n
2
Group 1.3
Ot =
c x Q
4187 x 170 x
1500
n
2
Group 2
Ot =
c x Q
4187 x 215 x
1500
n
2
If this results in a Ot of >10k, a check must be made
using this formula whether the respective limit of the
flushing medium temperature is observed.
T
act.
+ Ot T
limit
T
act.
= actual temp. of the flushing medium in °C.
T
limit
= corresp. temperature limit from table 1
or 3 in °C.
If the limit is not observed, the flushing flow must be
increased accordingly.
5.1.4 Filling the pump housing
9299-00-5013.4-01.1
Ventilation
valve
Suction valve
Flushing valve
Discharge valve
Picture 1
Check whether all the flange connections are
tightened. These include the suction flange, dis-
charge flange, housing flange and evacuation
flange.
MNK: When tightening the housing bolts, make
sure that the bracket is undone. Otherwise the
pump could be subjected to stress.
MNK-B: When tightening the housing bolts, undo
the screws in the lantern.
See Section 5.3 in the relevant installation and
operating manual.
Create venting possibility by opening the dis-
charge valve.
If a venting line is connected between the pump
and the discharge valve, the venting valve may
optionally be opened.
Open flushing valve.
Observe venting operation until no air but only
flushing medium emerges.
Open suction valve.
Observe venting operation again until no more air
emerges.
Only MNK: Turn pump shaft several times at the
coupling.
Observe venting operation again until no more air
emerges.
Close discharge valve and venting valve.
The suction valve and flushing valve remain
open.
The venting procedure is now completed. Further
commissioning can be continued using the pump
operating manual.
5.2 Operation
It must be ensured that flushing medium constantly
flows through the pump, e.g. by the installation of a
flow monitor. The flushing medium must remain in
operation even when the pump is switched off.
The suction side of the pump must also remain
opened during pump standstill so that the flushing
medium can continue to flow and the process
medium cannot enter the can.
5.3 Shutdown
Only close the flushing valve if the pump is to be
evacuated or dismantled.
It must be noted that the can chamber has to
be drained via the flushing connection.
During evacuation or flushing of the pump,
observe the local regulations. If the pump is
to be returned to the company's own work-
shops or the manufacturer's, it must be cleaned es-
pecially thoroughly.
See also Section 3.1 of the respective installation
and operating manual.