Author G.Gaillarde (MARIN), X. Zheng (Lloyd’s Register of Shipping)
Title MARIN Model Tests - Green Seas Hatch loading on Bulk Carriers’’, Design and operation of bulk carriers - Post M.V. Derbyshire
Conference/Journal Royal Institution of Naval Architects International Conference, London
Month October
Year 2001

This paper summarises the model testing and analysis methods used by MARIN during the extensive study on hatch cover loading on recent bulk carriers. The model tests took place in 2000 and 2001 and were undertaken for two Capesize and one Panamax bulk carriers. With the aim of modeling reality with maximum of accuracy, multidirectionnal wave spectra were generated and self-propelled models were used. Based on the experience gained during the Derbyshire model tests, dedicated instrumentation was developed further to measure accurately the vertical loading on hatch covers and the spatial distribution of these loads as well as the loading on the hatch coamings. Loads on forward deck equipment as winch and tube were measured in order to evaluate risk of damages that could yield flooding of the forward compartments. A flexible panel on hatch cover No.1 was also modeled in order to take into account potential hydroeleastic effects during impacts of green water. The results of the tests will, in conjunction with the statistical analysis being carried out at Lancaster University, enable new structural and safety standards to be defined for bulk carriers.

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