Home ShipmanagementClassification Societies New containership rules and guidance from Lloyd’s Register provide structural assurance

New containership rules and guidance from Lloyd’s Register provide structural assurance

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Tom Boardley

Tom Boardley

New containership rules and guidance from Lloyd’s Register provide structural assurance for the safety of ever larger containerships

Decade long, and on-going, research programme has developed a clearer understanding of the forces imposed on ship structures

Lloyd’s Register’s updated Containership Rules came into effect in July 2014 and these new rules are supported by Lloyd’s Register ShipRight Procedures covering whipping and springing analysis. Following the ShipRight Procedure will enable the granting of new Lloyd’s Register class notations ShipRight WDA – Whipping design assessment procedure, and ShipRight FDA (SPR) – Springing fatigue design assessment procedure, to enhance the response of ships’ structures that are subject to springing and whipping at sea.

While the basic rules that underpin containership structural strength are well established, as ship sizes increase, new challenges have emerged making continued research into the implications essential.

Modern containerships have very large deck openings, long, fine hull forms, a large bow flare (the projection of the forward deck outwards above the waterline) and operate at fairly high operational speeds (roughly 18 knots or over). They must, of course, meet the structural strength and fatigue requirements imposed by all sea conditions.

Lloyd’s Register’s research on large containerships has been ongoing over the past decade and includes a full-scale measurement programme conducted over five years on a large containership. This research has helped to identify the challenges faced by builders and operators of such ships and ensure that the ships’ structures are properly designed and remain within acceptable limits throughout their operational lives. More generally, Lloyd Register’s research and operational experience has provided the tools to properly and effectively assess the forces involved in large containership operation and thereby provide the appropriate rules and guidance.

New designs approved by LR have progressively benefited from the output of this research and development.

Lloyd’s Register’s Marine Director, Tom Boardley, commented “Ship safety is our main role as a classification society. You can’t have efficient ships unless they are also structurally safe. We have invested heavily in research and we have the depth of expertise in our hydrodynamics and structures teams to address this challenge.”

At SMM in Hamburg LR is releasing its Marine Technology Report, The Future of Shipping: Issue 01, New Generations of Large Containerships. This report, available on request, details the background work and science of understanding the forces involved in large containership design and operation.

Lloyd’s Register (LR) is a global engineering, technical and business services organisation wholly owned by the Lloyd’s Register Foundation, a UK charity dedicated to research and education in science and engineering. Founded in 1760 as a marine classification society, LR now operates across many industry sectors, with over 9, 000 employees in 78 countries.

LR has a long-standing reputation for integrity, impartiality and technical excellence. Our compliance, risk and technical consultancy services give clients confidence that their assets and businesses are safe, sustainable and dependable. Through our global technology centres and research network, LR is at the forefront of understanding the application of new science and technology to future-proof our clients’ businesses. www.lr.org

Lloyd’s Register and variants of it are trading names of Lloyd’s Register Group Limited, its subsidiaries and affiliates.Lloyd’s Register Group Services Limited (Reg. no. 6193893) is a limited company registered in England and Wales. Registered office: 71 Fenchurch Street, London, EC3M 4BS, UK. A member of the Lloyd’s Register group.

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