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Considerations associated with the testing of external pipeline coatings

conference contribution
posted on 2013-01-01, 00:00 authored by Davi Abreu, Mike Yongjun TanMike Yongjun Tan, A Bryson, A Fletcher, G Cope, G Pearson
Reliable testing methodologies for the assessment of protective coatings are critical for ensuring the integrity and durability of pipeline coatings (such as field joint coatings) and the mitigation of pipeline corrosion. Currently the failure of joint coatings is one of the major concerns in corrosion protection of pipelines, although they represent only approximately 5% of the coated area in a pipeline system. This paper presents an overview of major testing methodologies currently used in the pipeline industry for the selection, testing, and life prediction of coatings, in particular field joint coatings. Particular focus is on the discussion of difficulties and limitations in testing methods for assessing pipeline coating cracking, cathodic disbondment and loss of adhesion. It is shown that there are limitations in current methodologies in evaluating the coating flexibility - a key parameter for avoiding coatings cracking during hydrostatic testing, cyclic pressure operation and field bending. Methodologies for assessing the effect of holidays in coatings on the cathodic disbondment of pipeline coating under excessively negative cathodic protection (CP) voltages also require improvement. Furthermore, methods for understanding the effects of coating wet adhesion on pipeline coating, cracking and disbondment also need attention. Some preliminary results for addressing some of these issues are also presented in this paper.

History

Event

Corrosion and Prevention

Pagination

319 - 330

Publisher

Australasian Corrosion Association

Location

Brisbane, Qld

Place of publication

Melbourne, Vic

Start date

2013-11-11

End date

2013-11-13

ISBN-13

9781634394369

Language

eng

Publication classification

E Conference publication; E1.1 Full written paper - refereed

Copyright notice

2013, Australasian Corrosion Association

Title of proceedings

Annual Conference of the Australasian Corrosion Association 2013: Corrosion and Prevention 2013

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