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Shipping of liquefiable bulk cargoes: lessons from real-life incidents

During the first SAFETY4SEA Conference in Singapore, Mr. Lee Hiok Liang, Naval Architect, T&T Salvage, shared lessons learned from real-life bulk cargo liquefaction accidents, stressing that, apart from transportable moisture limit, sea condition is the other closely related critical parameter that causes high humidity cargoes to be unstable, more liable in rough sea for cargo shifting and consequential ship capsizing. In general, in the dry bulk cargo shipping industry there are two types of cargo instability that have been identified, so far. The first one is cargo liquefaction and the second one is cargo instability due to dynamic separation. We have two, it's not too many, but these two problems have caused a lot of safety issues to the seafarers and also the ship, that's carrying the cargo. But what is cargo liquefaction?When a vessel goes into the sea loaded with cargoes, it will encounter motion at sea and, at sailing time, this cargo will go through a process of settlements, compactions and when they compact, they release the air in between the cargo space, or in between the pore area. this pore area when it is compacted the water pressurebetween the pore spaceswill increase and these take away the ...

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Key causes of bulk carriers losses in the last 10 years

Between 2008-2017 there have been 53 total losses of bulk carriers of 10,000 tonne deadweight and above, with the reported loss of 202 seafarers, according to the Bulk Carrier Casualty Report 2017 by INTERCARGO. The report highlights that cargo failure is one of the greatest concerns for the safe carriage of dry bulk and is likely the cause of the loss of 101 seafarers’ lives and 9 vessel losses in the last ten years.

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Guidance for liquid cargo sampling

Disputes regarding “off-spec” or contaminated liquid cargoes are a repeated problem and shipowners may have no independent evidence as to the cause of an alleged cargo contamination. However, if the cargo is “off-spec” when the vessel arrives at the discharge port and there is no evidence of contamination from the load port, the vessel could be faced with a claim.

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