LR V.8 Primary structure
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Construction and Classification of Ships for the Carriage of Liquid Chemicals in Bulk, July 2022 - LR V Structural Arrangements and Scantlings - LR V.8 Primary structure

LR V.8 Primary structure

Parent topic: LR V Structural Arrangements and Scantlings

LR V.8.1 General

LR V.8.1.1 Direct calculation procedures are to be adopted where required by Pt 4, Ch 9 Double Hull Oil Tankers*. Additional calculations may be required where these are justified by the intended design or loading conditions, for example:

  1. Where double-skin construction is contemplated in association with large openings in wing cofferdams.

  2. Where Rule primary member scantlings and arrangements designed for transverse strength purposes on the basis of Pt 4, Ch 9 Double Hull Oil Tankers* are proposed for: the carriage of cargoes having relative densities in excess of 1,025, or pressure/vacuum relief valve settings which exceed a positive value of 0,2 bar gauge or a negative value of 0,07 bar gauge. See also LR V.7.1 General.

LR V.8.2 External deck transverses

LR V.8.2.1 Where deck transverses are fitted externally in way of the centre cargo tanks, the former are to be aligned with the internal deck transverses in wing tanks. The external transverses are to extend outboard of the longitudinal bulkheads to ensure continuity of structure and a satisfactory degree of end fixity. The outboard ends of the external transverses are to be tapered in the form of brackets, and slots in internal primary structure are to be collared in way.

LR V.8.2.2 Web stiffening and lateral support arrangements are to comply with Pt 4, Ch 9, 10 Construction details and minimum thickness* and are to include tripping brackets in line with longitudinal bulkheads. Tripping brackets fitted in way of wing tanks are to be supported by suitable underdeck structure.

LR V.8.2.3 Where continuous upperdeck girders are fitted externally, structural continuity is to be maintained.

LR V.8.2.4 External deck transverses and girders are in general to comply with cargo tank minimum thickness requirements.

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