ABS says new notation allows operators to carry extra tier of containers

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ABS says its new notation enables containership operators to optimise container loading on deck by applying specific load reduction factors tailored to different voyage segments.

The American Bureau of Shipping (ABS) has published a new notation, indicating that it allows containership operators to load an additional tier of containers on deck with reduced risk of loss due to parametric rolling.

ABS said that 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 without loss of safety margin.

“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 an additional 640 containers on a typical 15,000 TEU vessel (+4.4%) or up to 960 containers on a 24,000 TEU vessel (+4.6%).

CLP-V(PARR) calculates load reduction factors on specific routes and sections rather than on a complete voyage. The aim is to apply more specific load reduction factors and reduce the risk of cargo loss from parametric rolling.

The classification society said that because expected sea conditions are different from leg to leg, lashing calculation reduction factors and physical stowage on containerships can be adjusted accordingly. Therefore, by adjusting loading according to the section of the route being sailed, operators can benefit from higher loading capabilities as well as increased operational flexibility.

CLP-V(PARR) can be integrated into existing processes and is compatible with commercially available voyage planning software. According to ABS, the notation can be used to illustrate the impact on profitability of additional loading and the potential safety impact on making planned route diversions.

“ABS is working closely with voyage planning software developers to graphically visualise the parametric roll polar charts according to loading and weather conditions along the voyage,” said Peter Kim, ABS Senior Principal Engineer, Corporate Technology.

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