This CP gives a description of the procedures and requirements related to documentation, design and type testing applicable for TA of protective coating systems for seawater ballast tanks and double-side skin spaces.

This CP does not set the design requirements to the protective coating systems - seawater ballast tanks and double-side skin spaces. TA is based on compliance with design requirements given in the Society's rules and/or other regulations and standards. The CP describes how to document compliance with the requirements in order to obtain a TA certificate for the equipment. This includes, where relevant, technical requirements for how the type tests shall be performed.

A DNV type approval certificate will cover one grade of the actual product with the possibility to include variants.

For the coating system this means:

— grade: full coating system, including one or more coats (as per system definition)

— variants: colour variants and similar

A DNV type approval certificate is normally limited to one manufacturer at one production site.

The approval is solely connected to the corrosion prevention properties of the coating system. The approval does not include any evaluation of toxicity, contamination, pollution, or fire technical properties.

Type tests as specified in Sec.2 [3], are to be carried out and verified in one of the following ways:

— at a DNV laboratory

— at a recognized and independent laboratory or a laboratory accepted by the Society

— at the manufacturer’s premises in the presence of a surveyor.

As the approval of service supplier, see DNV-CP-0484, may be granted to laboratories either independent of the coating manufacturer or to the coating manufacturer's own laboratory there will be different follow-up from the surveyor during the testing period.

When actual testing, forming basis for test reports used to seek type approval from the Society, is carried out at the coating manufacturer's own laboratory the responsible surveyor shall be called in for witnessing milestones, typically:

— witnessing of selection of paint material from stock if applicable

— witnessing of sample surface preparation

— witnessing of primer application and weathering

— examination of surface and preparation prior to application of top coat

— witnessing of top coat application

— witnessing during testing

— witnessing evaluation of test.

Please refer to App.A for flow charts showing the involvement from class (i.e. surveyor).