Appendix D Overview of the Sea Water Scrubber System - Holland ...

Scrubber Exhaust
• ES301 ‐ high emissions leaving the scrubber (CO2/SO2 ratio value set at 65)
Wash Water Discharge
• Low pH in return to sea while in port (pH value set to be 6.5 within 4m of the ships side)
• High PAH in return to sea (set at 50 ppb maximum)
The safety circuit checks the main process parameters of the scrubber system and will shut the system
down in the event of an unacceptable reading. The main operating parameters that are checked are as
follows:
• LS300 ‐ high water level in the scrubber
• DPS300 ‐ high pressure drop across the scrubber
• Operation of the wash water supply pump
• Operation of the reaction water supply pump
• TS302 ‐ high temperature of the scrubber shell
In the event of a malfunction, a signal from the safety circuit initiates a shut down of the wash water
supply pump and also sends an alarm to the HMI. The scrubber will be in a run dry mode, ready for
restarting.