Hull Fouling White Paper

GreenSteam has developed four rules which, when combined with their machine learning (ML) platform, can truly optimise hull cleaning schedules to cut costs and reduce emissions.

Gareth Evans

15 Jul 2020

Hull fouling is world shipping’s biggest preventable cause of excess fuel consumption and avoidable Greenhouse Gas emissions.

This paper explores four KPIs operators can follow and identifies a single Rule #1 to optimise hull cleaning.

GreenSteam’s Rule #1 combined with automated push notifications allows vessel operators to reduce fouling - derived fuel wastage by around 40% (1)

Applied across the industry this could amount to an annual reduction in CO2 emissions of 40m MT (2) and an industry wide net payback of $1.0bn/year (3)




(1)For vessels, 1/MR tanker, 2/Handysize bulker, 3/Capesize bulker from 1.4 – 3.0 years, accumulated bunker waste from fouling was 1,714 MT (from 53 – 411 MT/year). Simulation following Rule #1 reduced fouling derived fuel wastage in MT by 42-48%.

(2)Assume 50,000 vessels trading 220d/year with 30MT/d propulsion consumption = 330m MT per year. GreenSteam clients (25 clients, multiple vessels) average fouling waste was 10% from DISCOVER trials, which is 33m MT of fuel per year applied to the world fleet. This translates to around 100 m MT of CO2 emissions. Rule #1 saves 40% = 40m MT CO2 per year.

(3)Average net payback from Rule #1 implementation is ± $20,000 per year (vessels 1-3, Appendix 9). Across 50,000 vessels this amounts to a net annual cost reduction of $1bn per year.



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