Continued Page 1.4
1 SAFETY PRECAUTIONS
PAGE
1.3R
Revision: 1 Date Name Signed
Substitute for issue issued 13.08.03 Mangel
of 17.06.03 approved 13.08.03 Denk
text no. 30100
released 13.08.03 Denk
copy to: 95
GB
The device for dry-running protection should be self-regulating.
This means that this device can give alarm signals and/or switch off the
pump also in case of failures in its own control system.
Dry-running protection concerning stationary immersion pumps
(with mounting plate)
Operation is only permitted with redundant or self-regulating automatic
devices to guarantee dry-running protection as well as to control the pump
capacity.
Dry-running protection concerning movable immersion pumps
(drum pumps)
The filling with liquid during the operation is to be ensured by specific
requirements of behavior:
– Drum pumps may only be introduced in and removed from
the container in switched-off condition
– Drum pumps, after being introduced in the container to be discharged,
may only be started after they have immerged in the fluid.
– Drum pumps are to be switched off before they run dry or are
to be switched off at once when specific noises ("slurping” or speed
rise) suggest that dry running may or will immediately occur.
3. Overpressure protection
The pump must not be loaded over the maximum allowable pressure.
The pump is to be equipped with an appropriate overpressure protection
device. The pump must not convey against a closed slide valve.
The overpressure protection device should be self-regulating.
4. Drives
The drives must be adjusted to the performance of each pump.
In the case of a blocking of the pump, the drives must be turned off
automatically by means of a motor protection unit.
5. Alignment of the drive
(concerning the pump types SY / SH / SA / SO / SF / SP)
It is absolutely necessary that the drive be aligned within the maximum
allowable tolerances. Incorrect alignment causes damage to the seals
and the shaft bearings.
6. Potential equalization concerning immersion pumps
The immersion pumps are to be integrated in the potential equalization
of the installation. Hand-operated movable immersion pumps are to be
grounded before being introduced in the container.
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