Section 2 Materials and protection

2.1.1 Materials, grades of steel and protection of materials are to comply with the requirements of Pt 3, Ch 2 Materials and Rules for the Manufacture, Testing and Certification of Materials, July 2022 Manufacture, Testing and Certification of Materials, of the Rules for Ships.

2.2.1 At the time of new construction or conversion, all salt-water ballast spaces having boundaries formed by the hull envelope or the potable water cargo tanks shall have an efficient protective coating, epoxy or equivalent applied in accordance with the manufacturer's recommendations. The durability of the coatings could affect the frequency of survey of the spaces and light coloured coatings would assist in improving the effectiveness of subsequent surveys. Those agreeing to the specification for the coatings and their application should take these aspects into account.

2.2.2 For further information and recommendations regarding the coating of salt water ballast spaces, see the List of Paints, Resins, Reinforcements and associated Materials, published by LR.

2.3.1 Sacrificial anode cathodic protection is not permitted in potable water cargo tanks.

2.4.1 The cargo tanks and metallic cargo piping and valves should be lined internally with a corrosion control coating suitable for the containment and transfer of potable water to the recipient country or port. The suitability of a coating is defined as being in compliance with the requirements for potable water quality on discharging and/or carriage conditions stipulated by the recipient country or port.

2.4.2 Corrosion control coatings should also be tested and certified as complying with the current standards for use with potable water, as set down by the European Union, when such certification is not a condition stipulated by the recipient country or port in Ch 1, 2.4 Coating of cargo tank and piping internals 2.4.1.

2.4.3 Corrosion control coating(s) are to be selected in consultation with paint manufacturers with regard to suitability with the proposed tank and piping cleaning practice.

2.4.4 Details of the cargo tank and piping corrosion control coatings are to be submitted to LR for information.

2.4.5 Uncoated cargo tanks and piping in an acceptable state of cleanliness may be permitted providing there is prior agreement with the recipient country or port authority.

2.5.1 Subject to compliance with Pt 5, Ch 12, 5 Plastic pipes and Pt 5, Ch 12, 7 Flexible hoses, and relevant sections of Pt 5, Ch 13 Ship Piping Systems of the Rules and Regulations for the Classification of Ships, July 2022, plastic piping which is internally uncoated may be considered for the transfer of potable water.

2.5.2 Any internally uncoated plastic piping or flexible hosing in contact with, and for the transfer of, potable water should be suitable for the containment and transfer of potable water to the recipient country or port. The suitability of a plastic piping material is defined as being in compliance with the requirements for potable water quality on discharging and/or carriage conditions stipulated by the recipient country or port.

2.5.3 Uncoated plastic piping and flexible hosing should also be tested and are to comply with the current standards for use with potable water, as set down by the European Union, when such certification is not a condition stipulated by the recipient country or port in Ch 1, 2.4 Coating of cargo tank and piping internals 2.4.2.

2.5.4  Plastic piping is to be selected in consultation with the manufacturers with regard to suitability with the proposed piping cleaning practice.