Wärtsilä Moss Scrubber 5MW closed-loop
Wärtsilä Exhaust Gas Cleaning. Wärtsilä scrubbers are marine exhaust gas cleaning systems (EGCS) that reduce SOx emissions through seawater spray or closed-loop systems with sodium hydroxide (NaOH) by 98%. They can operate in open-loop mode (seawater, discharge to sea after neutralisation), closed-loop mode (recirculation with alkali at low water alkalinity) or hybrid
Components & Design
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Technical Data
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Common failures & inspection points
Six-monthly visual inspection of absorber for signs of erosion and corrosion; pressure test of spray headers (low pressure = erosion); inspection for wear on venturi walls and deflector plates
Weekly inspection of spray headers and header on plugging or erosion; inspection of liquid pressure gauges to detect abnormally low pressures (indicator of erosion); six-monthly internal inspections for plugged or eroded nozzles
Annual full service and calibration of all sensors by certified technicians; regular inspection for probe fouling and sensor sensitivity; calibrate CEMS and water monitoring systems per manufacturer specifications
Continuous monitoring of inlet and outlet water quality; documentation of pH (min. 6.5), PAH, turbidity, temperature (max. 60°C); annual sampling to be performed no later than after first year of operation; 3-year retention of all test results
Wall thickness measurements of all effluent pipes and overboard lines at every annual class survey (DNV requirement); visual inspections for signs of corrosion and erosion; inspection of integrity of pipe supports and welds; particular attention to acid corrosion prior to seawater dilution
Six-monthly internal inspections of mist eliminator for fouling, plugging and corrosion; inspection for solids accumulation in eliminator; functional test of eliminator washdown systems; cleaning or replacement when damaged
Type-general inspection and maintenance points for this equipment category — not model-specific.
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