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Case Studies

In order to comply with the IMO regulations regarding lower sulfur emissions of 0.5% m/m as of 01.01.2020, vessel owners install Exhaust Gas Cleaning Systems (EGCS) / Scrubbers.

Scrubber manufacturers recommend the protection of certain areas: the distance piece overboard of scrubber drain line, the connection of sea water pipes where polyethylene coating is destroyed and the vessel’s side shell in a range of four meters around discharging pipe.

The Chesterton Solution:

Prior to the application of Chesterton ARC SD4i, the surface was washed with fresh water by hydro jet, the previous coating was removed and the surface was decontaminated and grit blasted to SA 2.5, followed by removal of abrasive residues. ARC SD4i was applied in two coats to protect metal surface against erosion, corrosion and aggressive chemical immersion without affecting the vessel’s hydrodynamic properties.

Application on side shell

Application on side shell 4m around discharge pipes

Overboard pipes distance piece internal protection

Side shell protection

Other Solutions:

  • SMO steel solutions are very expensive and unsatisfactory, as accelerated corrosion has been repeatedly reported within one year of operation, resulting in some cases in water ingress into the engine room, ballast and fuel tanks.
  • Conventional coating failure causes damages that require temporary repairs by divers or permanent repairs at shipyards – both resulting in high costs additional to the  losses of vessels’ current hiring rates of up to 150,000 USD per day.
  • Without the use of scrubbers, the vessel must use more expensive, low sulfur fuel oil in order to comply with the regulations.

Return on Investment:

Two 16ltr drums of SD4i with a cost of 4.720 USD were used. The cost of the Chersterton solution is almost negligible compared to the total cost of 3-4 million USD for installation of scrubber system and workmanship. Additionally, the expenses arising from repairs due to the use of low quality materials and the daily losses while the vessel remains off-hire must be taken into account. The expectation is that ARC SD4i coating will still be intact after 5 years of vessel operation.

 

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