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Testing agency: Cashew nutshell biofuel can cause problems on some ships

Fuel testing agency CTI Marinetec issued an advisory on Friday stating that several ships in Singapore and Rotterdam have reported problems with their operations in the last few months after using marine diesel blended with liquid cashew nutshell biofuel.

CTI-Maritec, a Singaporean company, said that it had tested samples taken from the ships in question and discovered that the marine fuel contained cashew liquid from unreported sources or production processes.

The agency reported that the ships had experienced operational problems such as fuel sludging and injector failure. They also encountered filter clogging, system deposit, and corrosion on turbocharger nozzle rings.

CTI-Maritec has not named the ships or shipping lines that were involved. It is not clear at this time how many vessels were affected.

The Maritime and Port Authority of Singapore and Port of Rotterdam didn't immediately respond to a comment request.

CTI-Maritec warned shipowners against using 100% cashew liquid in marine fuels or as a blend component or non-established bio-products for marine diesel engines.

The International Maritime Organisation (IMO) has issued guidelines on fuel oil supply to ships.

Cashew liquid is an alternative biofuel that is not FAME (fatty acids methyl esters). It is a byproduct from the cashew industry. It has been marketed as a renewable alternative fuel but it is also corrosive and has high acidity.

In order to reduce emissions, ship owners are exploring marine biofuel blends to replace dirtier bunker fuels.

The ISO 8217 specification for marine fuels, the latest version, specifies that biofuels such as FAME-based biofuels or hydrotreated vegetable oils are acceptable.

CTI-Maritec stated that there is no marine fuel standard available for cashew liquid.

(source: Reuters)