Grundfos NK Serie Instrucciones De Instalación Y Funcionamiento página 11

Text
Description
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Monitoring
1 No additional monitoring, for example dry-running protection, is required for the pump system.
If the operator cannot ensure that the pump is filled with pumped liquid during operation, appropriate
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monitoring, for instance dry-running protection, is required to stop the pump in case of malfunction.
3 No additional monitoring, for example dry-running protection, is required for the auxiliary unit.
If the operator cannot ensure that the auxiliary unit is filled with barrier or flushing liquid during
4 operation, appropriate monitoring, for instance a level switch, is required to give an alarm in case of
malfunction.
5 In case of a drop in barrier liquid pressure, a warning must be given. Check the system and remedy.
In case of a drop in barrier liquid pressure, an alarm must be given, and the system must shut down if
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the barrier liquid pressure is not brought back to the correct pressure level.
Circulating liquid
If circulation of the barrier or flushing liquid is lost, a warning must be given. Check the system and
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remedy.
If circulation of the barrier or flushing liquid is lost, an alarm must be given. Check the system and
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remedy. The system must shut down if the circulation cannot be re-established during operation.
Ventilation
10 Ventilation around the pump is not required.
The leakage rate of a normally working shaft seal is less than 36 ml for each 24 hours of operation.
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Ventilation around the pump is required. The minimum air exchange is 1.5 times per hour.
CAUTION
Flammable material
Minor or moderate personal injury
- The responsibility for checking the
functions of the dry-running protection,
such as flow rate, sealing pressure and
temperature of the barrier or flushing
liquid, rests with the installer or owner.
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