Tag: liquefaction

Filter By:

Focus: Cargoes subject to liquefaction

IMSBC Code Group A - Nickel Ore - Iron Ore Fines - Bauxite Cargo liquefaction may result in cargo shift and loss of stability; this has been the cause of a number of serious casualties during the last years and now liquefaction is being considered as a major hazard for bulk carriers.Liquefaction occurs when a cargo (which may not appear visibly wet) has a level of moisture in between particles. During a voyage, the ship movement may cause the cargo to liquefy and become viscous and fluid, which can lead to cargo flowing with the roll of the ship and potentially causing a dangerous list and sudden capsize of the vessel. Special consideration and precautions should be taken when loading a cargo which may liquefy.DNV GL has recenlty published an informative guideline for the design and operation of vessels with bulk cargo that may liquefy. The main risk for a vessel carrying cargo that may liquefy is shifting of the cargo.The following cargoes are subject to liquefaction:1. IMSBC Code Group AIn the IMSBC Code, the cargoes have been divided into three groups. Group A consists of cargoes that may liquefy. Group B are cargoes with a chemical hazard. Group C ...

Read more

Lessons learned from accident due to unsafe loading of nickel ore

Unsafe cargo and unsafe anchorage resulted in the loss of ship The Nautical Institute has issued Mars Report regarding an accident occurred due to unsafe loading of nickel ore and unsafe anchorage which resulted in the loss of ship. The IncidentA bulk carrier was to load a cargo of nickel ore from barges intofive holds. During loading, which took approximately three weeks,intermittent rainfall caused interruptions in loading. The ore on thebarges had to be covered over with tarpaulins and the holds on thevessel had to be closed. The crew of the vessel carried out a 'can test'of the ore on each barge before transfer to the vessel.If the test failed,an 'oven drying test' was done to determine the moisture content ofthe ore. If the moisture content was found to exceed the TransportableMoisture Limit (TML was 34.80%), the cargo in the barge wouldnormally be rejected.However, records indicate that on at least two occasions cargo wasaccepted with moisture contents of 35.54% and 37% respectively.Oncethe loading was completed, the holds were trimmed and pressed bymeans of cargo grabs; each cargo hold was about half-full. Calculationsshowed the vessel's intact stability met the requirements of theInternational Code on Intact Stability, 2008. About a week after ...

Read more

Most common causes for liquefaction-related incidents

DNV GLs guidelines for mitigating actions DNV GL has published a guideline for the design and operation of vessels with bulk cargo that may liquefy. The guideline aims to raise the awareness of the risks of liquefaction and describes mitigating actions to reduce these risks. The following causes are the most common causes for liquefaction-related incidents, along with DNV GLs guidelines for mitigating actions:1. Wrong cargo nameThe name of the cargo should be described by using the Bulk Cargo Shipping Name (BCSN) as detailed in the IMSBC Code. Sometimes shippers use trade or commercial names instead. The trade or commercial name may be used as a supplement to the BCSN, but must not be used as a substitute. The consequence of not using the proper name could be that the risks of the cargo are not correctly detected.Guideline:The Master and shipper/operator should always make sure the cargo is correctly identified before loading.2. Cargo not listed in IMSBC CodeIf the cargo is not listed in the IMSBC Code, such as bauxite with high moisture content, the shipper must provide the competent authority of the port of loading with the characteristics and properties of the cargo. Based on the information received, the ...

Read more

IMO issues circular on Carriage of Bauxite that may liquefy

CCC.1/Circ.2 IMO has issued a circular approved by IMOs Sub-Committee on Carriage of Containers and Cargoes (CCC) meeting (14 to 18 September 2015) to advise masters when to accept cargo of bauxite.The cargo of bauxite was declared as a Group C cargo under the International Maritime Solid Bulk Cargoes (IMSBC) Code. However, the Sub-Committee noted the information in the Bahamas document CCC 2/5/16 that loss of the vessel may have been caused by liquefaction of the cargo.The Sub-Committee also considered proposals made by Australia and co-sponsors with respect to the properties of bauxite and the need for the cargoes material properties to be further examined in order to ensure that the cargo can be carried safely.The Sub-Committee concluded that:there is a need to raise awareness, despite the efforts to date made by the Member clubs of the International Group of P&I Clubs, of the possible dangers of liquefaction associated with carriage of bauxitethe potential for bauxite to liquefy is not specifically addressed in the IMSBC Code, since it is only classified as Group C cargo;if a Group A cargo is shipped with moisture content in excess of its transportable moisture limit (TML) there is a risk of cargo shift, which ...

Read more
Page 7 of 10 1 6 7 8 10