ABS adds notation to increase calculated safe container capacity

Class society ABS has published a new notation that can be integrated with weather routing software systems to enable containership operators to load an additional tier of containers on deck with reduced risk of loss due to parametric rolling.

CLP-V(PARR) combines the ABS Computer Lashing Program notation with mandatory Parametric Roll guidance to allow operators to optimise stowage and lashing of containers.

“Optimising container loading is key to efficient vessel operations but also has a foundational impact on safety, especially where container losses are concerned. This challenge has been addressed with the new notation,” said Christoph Rasewsky, ABS Global Container Sector Lead.

“Applying CLP-V(PARR) means that operators can achieve the most flexible loading configurations and stay within the required safety margin.”

Integrated into a weather routing program, CLP-V(PARR) provides operational guidance that can allow the loading of up to additional 640 containers on a typical 15,000 teu vessel or up to 960 containers on a 24,000 teu vessel, an increase of approximately 4.5% in each case.

CLP-V(PARR) calculates load reduction factors on specific routes and sections rather than on a complete voyage, analysing sea conditions using wave scatter diagrams so carriers can apply more specific load reduction factors and reduce the risk of cargo loss from parametric rolling.

Because expected sea conditions are different from leg to leg, lashing calculation reduction factors and physical stowage on containerships can be adjusted accordingly, allowing operators to adjust loading according to the section of the route being sailed and benefit from higher loading capabilities as well as increased operational flexibility.

ABS says that CLP-V(PARR) can be integrated into existing processes and commercially available voyage planning software as required.

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Rob O'Dwyer

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