6. Coating defects

6.1 Open coating defects

Open defects mean deterioration in the coating leading to exposure of the steel of the pipeline to its environment. These are for the most part due to mechanical damage: either when the structure is laid, or when the structure is in operation, particularly when work is being carried out in the vicinity by a third party. The most frequent damage is as follows :

poor choice of backfill material: particle size too great, stone too hard (silex), crushing at the bottom of the trench;
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Coating defects

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Coating rehabilitation

Bibliographical sources

(1) - BAROUX (B.) - La corrosion des métaux, passivité et corrosion localisée . - Dunod (2014).
(2) - BERANGER (G.), MAZILLE (H.) - Corrosion et anticorrosion, pratique industrielle ....

Norms and standards

Paints & Varnishes – Corrosion protection of steel structures by protective paint systems - ISO 12944-5 - 2018
Preparation of steel substrates before application of paints and related products – Visual assessment of surface cleanliness – Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coating - ISO 8501-1 - 2007
Petroleum...

Regulations

Articles L. 555-1 to L. 555-30 of the French Environmental Code

Articles R. 555-1 to R. 555-52 of the French Environmental Code

GESIP technical guides

Decree of 5 March 2014 defining arrangements for the application of Chapter V of Part V of Book V of the Environmental Code including regulations on the safety of pipelines for the transport of natural...