31
Dry running in
the sealing
chamber
Double seal
Seal supply
system
Flow monitoring of a flushed seal
If the flow rate of the flushing reaches a critical value, the pump unit
must be brought automatically and immediately into a safe operating
condition.
A flow monitoring system must be installed in such
a way that the
sealing chamber is continuously filled with sealing medium.
Fill level monitoring of a quenched/blocked seal
If the filling level of the quench/sealing pressure system reaches a
critical value, the pump unit must be brought immediately into a safe
operating condition.
Monitoring the level of the quench/sealing pressure system by
displaying critical values.
- Critical values in a sight glass on the sealing medium container:
The filling level of the sealing medium falls below the lower edge
of the sight glass.
- Critical values in two or three sight glasses in the sealing medium
container:
Fill level of sealing medium at the level of the lower sight glass.
Monitoring the level of the quench/sealing pressure system by
displaying critical values and/or automatically transferring to a safe
operating condition.
- Fill level switch in the sealing medium container switches when
the critical level of the sealing medium is reached.
The pump unit must not be put back into operation until the fault has
been rectified.
If other or further values of these monitoring parameters must be
complied with, these are contained in the order-related
documentation, sectional drawing of the shaft seal or documentation
of the seal manufacturer.
Containment
shell
temperature
Pump with
magnetic
coupling
If the pumping medium or the surface of the containment shell of a
magnetically coupled pump reaches a critical value, the pump unit
must be brought automatically and immediately into a safe operating
condition
Shutdown of the pump unit.
The pump unit must not be put back into operation until the fault has
been rectified and the interlock reset.
Set a suitable resistance thermometer to the limit value of the
respective temperature class (see section 3.1.3.5).
Monitoring the containment shell temperature is not sufficient for
monitoring dry running!
Motor
protection
Temperature monitoring with thermistor temperature sensor (PTC ),
PT100 or thermoswitch in the winding. (See operator's manual of the
motor manufacturer).
