Water Monitoring System
Ver.5.0.1 – Revision August 2022 Page 57 of 111
9.4 Impeller Pump
The lifetime of the pump highly depends on the working condition and water quality. The
pump cannot run dry. The pump will also be damaged if the sample line is blocked when
the pump is running. High discharge pressure will reduce impeller lifetime. Chemicals in
the pumped media can attack the impeller material resulting in swollen impeller which
increases friction in the pump housing leading to premature failure.
If swollen impeller is noticed another impeller material must be chosen. The impeller can
stick to the pump housing after stand still. It is important to ensure that the impeller is not
stuck prior to attempting startup. The entire pump unit can be replaced, or the necessary
spare parts can be fitted.
It is recommended to keep an impeller, end cover (for pump Type A), wear plates (for
pump Type B) and shaft seal in stock as a spare part.
ATTENTION
Air and particles will reduce lifetime. Major particles can result in immediate breakdown.
Special consideration must be taken in the following scenarios:
• The scrubber installation is intended for long duration in open loop operation in
coastal waters.
• Soot blowing
• Major changes in static pressure e.g., draft condition
• Changes in scrubber operation mode e.g., valve switch over
Always consult installation manual.
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