Class approval for PureSOx scrubbers

10 Feb 2015
Alfa Laval’s PureSOx scrubber system installed onboard the DFDS Petunia and Primula Seaways has gained its first class approvals

Alfa Laval’s PureSOx scrubber system installed onboard the DFDS Petunia and Primula Seaways has gained its first class approvals

Alfa Laval has secured the first class approvals from Lloyds Register for its PureSOx scrubber system installed onboard the DFDS Petunia and Primula Seaways.

This is certainly a major achievement for Alfa Laval seeing that the scrubber approval process is anything but smooth.

Kate Schrøder Jensen, development engineer, exhaust gas cleaning, Alfa Laval, added: “Unfortunately there are various interpretations from class societies, and there will continue to be some uncertainty regarding pH limits for scrubber water discharge.”

IMO’s Pollution Prevention and Response subcommittee recently drafted an amendment to paragraph 10.1.2 (ii) in the scrubber guidelines, which would allow the use of calculation-based methodologies alongside measurements.

Measurements have so far been the only practical method of getting open-loop seawater scrubbers approved, but they are not without problems. They need to be taken at full scrubber load based on maximum fuel-sulphur content, as well as while the vessel is ‘at rest in harbour’, which excludes ships that are directly shaft-driven.

Alfa Laval’s hope is that the MEPC will approve the amendment in May because it believes it will simplify the approvals of open-loop scrubbers.

With class approvals in hand and a steady PureSOx order flow, the company continues to invest in scrubber technology. Last year saw the inauguration of the Alfa Laval Test & Training Centre in Aalborg, Denmark, which has added considerable muscle to the company’s development abilities.

The company said it saw a steady growth in exhaust gas cleaning in 2014 and is prepared for an even higher order intake in 2015 with the enforcement of Emission Control Areas (ECAs) coming into force.

Now in its second generation, Alfa Laval's PureSOx system has accumulated an order portfolio comprising over 1100 connected megawatts on roughly 65 vessels, including two full-scale pilot installations and the first orders in the US and Asia.

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