Mitsubishi Shipbuilding said its DIA-SOx series of scrubbers for high-powered engines have been installed on 22 ships of three different types in 2020
The installations were completed as scheduled and in spite of complications with the ongoing coronavirus pandemic, through remote commissioning conducted with close communication and co-operation with the engineers of Mitsubishi’s local partners in China and Singapore, Mitsubishi said in a statement.
The R Series versions of the technology have been installed on five 20,000-TEU ships, eight 14,000-TEU ships and five container ships up to 10,000 TEU, while the C Series has been fitted on two large oil tankers with dead-weight capacity of 300,000 tonnes and two LPG carriers.
For the 14,000-TEU container ships, Mitsubishi Shipbuilding provided engineering services in addition to scrubber systems. The scrubber tower was installed in the built-in casings on the port side of the existing funnel, and the scrubber system was installed without reducing container loading capacity.
Mitsubishi said the systems have received approval from Class NK, Lloyd’s Register, American Bureau of Shipping and other classification societies.
Mitsubishi’s DIA-SOx scrubbers include the R Series and C Series and Mitsubishi Shipbuilding provides retrofit engineering for installing both scrubber types. The R Series’ rectangular tower design is suited for container ships and its multi-stream configuration can treat exhaust gas discharged from multiple engines with one tower, including the large main engine. The C Series with a cylindrical tower design also utilises the multi-stream configuration.
Since March 2020, ships are prohibited from retaining fuel oil with a sulphur content exceeding regulation levels on board unless fitted with scrubbers.
Open-loop exhaust gas cleaning system bans are in place in China and Singapore. In addition, Pakistan, Bahrain and Malaysia have all banned open-loop scrubbers. In January 2020, the Suez authority prohibited the use of open-loop scrubbers for ships transiting the Suez canal.
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