Section 3 Aluminium erections
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Inland Waterways Ships, July 2022 - Part 3 Ship Structures (General) - Chapter 8 Superstructures, Deck-houses and Bulwarks - Section 3 Aluminium erections

Section 3 Aluminium erections

Parent topic: Chapter 8 Superstructures, Deck-houses and Bulwarks

3.1 Restrictions in application

3.1.1 Attention is drawn to the fact that National and International Statutory Requirements restrict the application of aluminium for certain types of ships.

3.2 Scantlings

3.2.1 Where an aluminium alloy complying with Ch 8 Aluminium Alloys of LR’s Rules for Materials is used in the construction of erections, the scantlings of these erections are to be increased (relative to those required for steel construction) by the percentages given in Table 8.3.1 Percentage increase of scantlings.

Table 8.3.1 Percentage increase of scantlings

Item Percentage increase
Fronts, sides, aft ends, unsheathed deck plating 20
Decks sheathed in accordance with Pt 3, Ch 2, 3 Deck covering 10
Stiffeners and beams 70
Scantlings of small isolated houses Nil

3.2.2 The thickness, t, of aluminium alloy members is to be not less than:

t = 2,5 + 0,022d w mm, but need not exceed 10 mm
= where
d w = depth of section, in mm.

3.2.3 The minimum moment of inertia, I, of aluminium alloy stiffening members is to be not less than:

I = 5,25Z l1 cm4
= where
l1 = the span of the member, in metres, and Z is the required section modulus of the steel stiffening member obtained from Pt 3, Ch 8, 2 Scantlings of erections.

3.3 Bimetallic joints

3.3.1 Where aluminium erections are arranged above a steel hull, details or the arrangements in way of the bimetallic connections are to be submitted.

Copyright 2022 Clasifications Register Group Limited, International Maritime Organization, International Labour Organization or Maritime and Coastguard Agency. All rights reserved. Clasifications Register Group Limited, its affiliates and subsidiaries and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Clasifications Register'. Clasifications Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Clasifications Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract.