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Case Studies

On 01.01.20 the new IMO SOx regulation came into force and the limit for sulfur in fuel oil used on board ships was reduced to 0.5% m/m. One option vessel owners have, is to 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.

Application:

Temperature: <50ºC       2.5<pH<8

Nitrates, Sulphates, Chlorides etc.; oil solids from unburnt fuel oil; high sea water velocity

The Chesterton Solution:

Coating must protect the metal against corrosion, erosion and aggressive chemical immersion and should not affect the vessel’s hydrodynamic properties. 

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 with min. DFT750μm.

 

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 have been proven 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.
  • The same has been reported for conventional coatings, as they cannot withstand the acidic environment in combination with oil solids and the high velocity of the wash water.

Return on Investment:

In most cases, two 16ltr drums of SD4i are sufficient to cover the entire application on a vessel. Therefore, the cost of the Chersterton solution is almost negligible compared to the total cost of 3-4 million USD for the installation of a 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. 

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.

The first vessels we have supplied ARC SD4i to, are now 2 years in operation without any signs of coating failure reported.

 

 

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