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West P&I Club: Cargo tank cleaning and preparation

West P&I Club has issued a Loss Prevention Bulletin about best practices and guidelines on cargo tank cleaning and preparation onboard tankers. West P&I highlights that product and chemical tankers carry a variety of commodities, often necessitating frequent tank cleaning to prevent a cross-subsequent off-spec claim. Detailed planning of the tank cleaning is crucial, and the ship’s crew must be informed of the schedule. The extent of cleaning required depends on the properties of the previous cargo, the tank coating, the next cargo's preloading specifications and the shipper’s requirements. Why is tank cleaning necessary? Tank cleaning is essential in the following circumstances: Preparing for the next cargo Dry dock Regulatory Compliance: adhering to MARPOL and other IMO Conventions/Codes Preventing build-up of residues e.g. in Residue Oil Tank (ROT) / Slop Tanks Facilitating gas freeing for tank inspection / mopping / maintenance / repairs Complying with the charter party agreement In extreme circumstances to prepare for carrying clean ballast Tank preparation encompasses various stages, with tank cleaning being the most common. The preparation steps vary depending on the type of vessel and cargoes. These steps include: Planning Effective tank cleaning requires careful planning, considering cargo details, environmental factors, and system components. The plan should address cleaning methods, risks, ...

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