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Association estimates that about 3,800 scrubber units will to be installed before the sulphur cap goes into effect, with 63% of installations involving retro ts and more than 70% scheduled to take place in Asian and Middle East shipyards.
The IMO is also implementing the Ballast Water Management Convention (BWM Convention) aimed atcurbing the number of invasive species spread by ships’ ballast water. Under the convention, which entered into force globally on 8 September 2017,operators with vessels that discharge ballast water in international waters must have a treatment system installed on their vessels within  ve years. The speci c deadline depends on the next renewal survey of a vessel’s International Oil Pollution Prevention certi cate.
Shipyards are riding the green technology wave. After a slow start, installation of scrubbers on existing ships has accelerated as it has become increasingly apparent that the IMO would not defer the implementation date unlike the BWM Convention which was adopted in 2004 but took effect only in September 2017.
In 2018, Keppel Shipyard secured a total of 65 contracts from various customers for exhaust gas scrubber retro t projects while Sembcorp Marine clinched its biggest contract forgreen technology retro ts from Maran Tankers which involves the installation of marine scrubbers and BWM systems on 13 of its tankers.

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