Quizzed article | REF: COR665 V1

External coating for buried or immerged pipelines

Author: Thierry Kerzerho

Publication date: April 10, 2021, Review date: September 2, 2020 | Lire en français

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4. Field joint coatings

4.1 Different types of coating

When a pipeline is constructed, sections measuring between 12 m and 18 m in length are welded together. Figure 6 shows a welded joint following surface preparation. At the cut-backs, protection needs to be restored that is equivalent to the factory-applied coating, but under site conditions, which can sometimes be sub-optimal (poor weather, temperature, workspace). The application of coatings perpendicular to welded joints is thus a sensitive operation, requiring rigorous product selection and mastery of the application methods.

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Field joint coatings

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Inspection of coatings

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...