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HANSA 06-2018

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Schiffstechnik | Ship

Schiffstechnik | Ship Technology »Scrubbers demand exhaustive treatment« Owners committed to retrofit exhaust gas cleaning systems (EGCS) to deal with IMO’s 2020 global cap on fuel sulphur content need to keep in mind that no »one size fits all« solution exists, even across sister ships, says Olli Somerkallio, Head of Machinery Department at Foreship Fitting large equipment to existing vessels is always challenging,« the expert at the design and naval architecture company explains. »Scrubber installations seem straightforward, but they actually call on our full-service capabilities as a design house, involving our machinery, hull, electric, stability and safety departments.« Driven by the entry into force of Emissions Control Areas, ships have had to achieve emissions equivalent to 0.1% sulphur content fuel from January 1, 2015. Scrubbers »wash« exhaust gases and allow ships to continue burning HFO with a sulphur content of 3.5%, or even higher, while achieving the ECA limit. From 2020, an IMO emissions limit equivalent to burning 0.5% sulphur fuel content »goes global«, affecting an estimated 60,000 ships. Somerkallio recently drew attention to oil company expectations that, while most of shipping would turn to lower sulphur fuel to meet the 2020 emissions restrictions, a subsequent drop in Olli Somerkallio, Head of Machinery Department, Foreship HSHFO prices could mean up to 30% of ships could gravitate back to the fuel type by 2030. The number of scrubbers in position by 2020 may not exceed 4,000, he said, but future oil pricing would have a positive influence of ROI. Foreship has so far participated in 34 EGCS projects, including 29 full retrofits, covering cruise ships, passenger ro-ro vessels, freight ferries and a containership. »Scrubber installation is one more example of having to give up revenue-earning space to meet a regulatory requirement, so our target must be to minimize the pain for the owner,« says Somerkallio. As well as the design and installation work itself, scrubber projects demand material selection for harsh environments, ship stability analysis, exhaust gas back pressure calculations and equipment room ventilation calculations. The Foreship team advises that open loop systems are simpler, using seawater for scrubbing but discharge waste water containing sulphur, which is not allowed in some locations. Closed loop systems recirculate treated fresh water, avoiding the waste water issue, but are more complex and costlier to run, and create waste storage and handling issues on board. Hybrid systems can operate as an open loop system while outside special areas, it is said. A typical retrofit on board a 1990s-vintage cruise ship on which Foreship consulted saw an EGCS installed to accommodate four 12.6 MW four-stroke engines with the hybrid units scrubbing exhaust from all four main engtines. Also typical was a retrofit on board a RoRo ship built in the early 2000s, powered by twin 8.1 MW fourstroke engines. In this case, a »hybrid ready« scrubber was selected. Photo: Foreship 46 HANSA International Maritime Journal – 155. Jahrgang – 2018 – Nr. 6

Schiffstechnik | Ship Technology For Foreship, in all cases, the design process begins with a feasibility study that draws on systems and structural inspections made on board, and a comparison of available exhaust gas cleaning equipment. The subsequent basic design work generates drawings to cover the EGCS arrangement, tank plan, piping and scrubber water diagrams, electrical and automation integration design, the stability & loading manual, damage stability calculations, the structures for the scrubber room and/or foundations and the sea chest, and the process tanks. This is supplemented by detail design, which is handled by the systems integrator. In principle, the processes could result in modifying existing drawings for the installation team. »The system work is also usually more complex than it first appears,« Somerkallio observes. »New pumping, water treatment and tank storage equipment will be required, but consideration is also needed at the individual ship level of the need to integrate the EGCS with existing equipment, the routing of large diameter piping and its communication with the ship’s automation systems. In the cruise market, owners also expect installation to be carried out when the ship is under way.«ED Source: Foreship HANSA International Maritime Journal – 155. Jahrgang – 2018 – Nr. 6 47

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