During marine cargo transportation, seafastenings are used to restrain cargo to a vessel's deck and prevent horizontal motions and/or overturning. Industry practice demonstrates a preference for hard tie-downs (i.e., welded steel structure) instead of chain, wire, or webbing lashings. For large cargoes, current industry guidelines do not explicitly address whether or not lashing can be used, and (if used) what constitutes a sufficiently safe and reliable lashing design. This paper walks through the design assurance process used by the authors for two recent marine shipments for the oil and gas industry; these shipments relied on chain lashing as seafastening for four large, highconsequence cargoes. The authors' experience is communicated to the marine industry to help guide similar marine transportation engineering efforts in the future toward a safe, reliable, and efficient design.

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