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One third of shipping will opt for exhaust gas scrubbers: Foreship

The leading naval architecture and engineering consultancy Foreship expects that as IMO’s 0.50 sulphur cap in marine fuel comes into force in 2020, one third of shipping will eventually opt for gas scrubbers.

As it is, Foreship argues, that there are just over 100 ships running on LNG and it is quite likely that the number may be below 500 by 2020; but, the  0.1% fuel sulphur content limit inside emissions control areas has brought 1,500 scrubber installations, yard capacity could only grow that number to 3,000-4,000 by 2020. Most ships will run on 0.5% sulphur content HFO to meet the cap.

Foreship Head of Machinery Department, Olli Somerkallio explains that, post 2020, 0.5% sulphur content fuel will be blended from distillates and HFO of up to 2.5% sulphur content. Higher sulphur HFO (HSHFO) can be used as a marine fuel where scrubbers are installed, but could also be a substitute fuel in gas powerplants in former Soviet countries, or a coal substitute. This will change the pricing dynamic of HSHFO: to compete with coal, prices would have to be relatively low.

The implication is that HSHFO will return to favour as a marine fuel after the dust settles. “This will have a significant impact on the ROI of scrubbers in the future,” says Somerkallio.

Foreship has significant experience in offering independent advice on adapting ships for new marine fuels and emissions abatement. Its reference list includes 34 exhaust gas scrubber retrofit projects to enable 13 cruise ships, 11ro-pax ferries, nine ro-ros and one containership to burn HFO in ECAs. Based on this experience in the industry, Foreship has advised its customers to select multi-stream or in-line scrubbers, open loop, closed loop or hybrid systems.

“We have faced and overcome a broad range of installation challenges, including the fact that scrubbers eat into the revenue-earning space required for passengers or freight,” says Somerkallio. “We are also very familiar with the equipment options in the market and supplier references.” As well as needing new pumping, water treatment and tank storage equipment, exhaust gas scrubbers demand considerable new pipework on board. Installing inline means that existing silencers need to be replaced with larger equipment, causing a space challengeforcasing.

“Gaining this experience provides a wealth of independent experience that owners of cargo ships can draw on as the 2020 global sulphur cap approaches,” says Somerkallio. “The track record is also long enough to understand that ships within the same project do not always benefit from the same equipment selection.”

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