Section 2 Corrosion protection
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 2 Materials - Section 2 Corrosion protection

Section 2 Corrosion protection

Parent topic: Chapter 2 Materials

2.1 General

2.1.1 All steelwork, except inside tanks intended for the carriage of oil or bitumen and inside void spaces which are permanently sealed, is to be suitably protected against corrosion. This may be by coating or by any other approved method. For the protection required in tanks carrying chemicals or other special cargoes, see Pt 4, Ch 4 General Requirements For Tankers Carrying Dangerous Liquids in Bulk, Pt 4, Ch 5 Tankers of Type G, Pt 4, Ch 6 Tankers of Types C and N, and Pt 4, Ch 7 Water Tankers, Wine Tankers and Edible Oil Tankers.

2.1.2 Where bimetallic connections are made, measures are to be incorporated to preclude galvanic corrosion.

2.2 Surface preparation, prefabrication primers, and paints or coatings

2.2.1 Steelwork is to be suitably cleaned and cleared of millscale before the application of surface paints and coatings. It is recommended that blast cleaning or other equally effective means be employed for this purpose.

2.2.2 Where a primer is used to coat steel after surface preparation and prior to fabrication, and which is not type approved by LR for this purpose, the composition of the coating is to be such that it will have no significant deleterious effect on subsequent welding work and that it is compatible with the paints or other coatings subsequently applied.

2.2.3 To determine the influence of the primer coating on the characteristics of welds, tests are to be made to the Surveyors’ satisfaction.

2.2.4 Paints or other coatings are to be suitable for the intended purpose in the locations where they are to be used. Unless previously agreed, at least two coats are to be applied.

2.2.5 The paint or coating is to be compatible with any previously applied primer, see Pt 3, Ch 2, 2.2 Surface preparation, prefabrication primers, and paints or coatings 2.2.2.

2.2.6 Paints, varnishes and similar preparations having a nitrocellulose or other highly flammable base are not to be used in accommodation or machinery spaces.

2.2.7 In ships intended for the carriage of oil cargoes having a flash point below 55°C, paint containing aluminium should not, in general, be used in positions where cargo vapours may accumulate, unless it has been shown by appropriate tests that the paint to be used does not increase the incendive sparking hazard.

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