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Bunker Flowmeter Magnets Attract Attention in Singapore
Concerns have been raised on the use of magnets to manipulate bunker barge mass flow meters (MFM).
Marine fuel publication ‘Ship & Bunker’ has reported that evidence of flowmeter tampering was found by an attending surveyor in Singapore whilst on a supplying vessel.
Neodymium magnets – which are a type of permanent magnet – were allegedly found attached to the ‘u’ section of the barge’s mass flow meter using adhesive tape. It is understood that magnets can interfere with the Coriolis Effect which is the principle of mass flowmeter operation.
It is not clear how much influence magnets have on the accuracy of mass flow meters and it is not yet known if this practice is widespread.
However, receiving ships’ crews should remain vigilant and pay close attention to the delivery and measurement arrangements on supplying vessels. Avoid relying wholly on mass flow meters for bunker quantity assessments – it remains prudent to also carry out a full set of soundings on both barge and vessel before and after bunkering.
North’s loss prevention guide ‘Marine Fuels: Preventing Claims and Disputes’ contains sound guidance on bunkering procedures.
The Ship & Bunker article can be accessed here.
