10038 Characterization of Internal and External Coatings Used on steel Pipelines

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Product Number: 51300-10038-SG

ISBN: 10038 2010 CP

Author: Steven Waters, Haralampos Tsaprailis, William Kovacs III, Joshua Tuggle and Luis Garfias-Mesias

Publication Date: 2010

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Accelerated Corrosion Testing (ACT) of external pipeline coatings traditionally has been associated with the ASTM B117 Salt Fog Test (which is also similar to other standards like the BS3900 Parts F4 and F12 and the ISO standard 7253). There are other types of ACT for coatings that use “salt spray” type tests; for example, the acidified salt spray (ASS) and copper acidified salt spray (CASS) tests, which use test solutions containing acetic acid and copper chloride with acetic acid. Recently, ACT of coatings has been performed using corrosive gases in a closed environment at constant temperature and with varying relative humidity (RH). This test resembles the standard ACT for Electronic Equipment and Devices. The objective of these (sometimes cyclic) tests is to try to mimic naturally occurring wetting and drying cycles with the addition of a known acceleration factor.

The standard ACT tests are important in the development of new coatings and are commonly used to qualify new coatings and surface treatments for novel material/environmental applications. Common practices employ rapid “round robin ACT testing” to down select coating systems from a large number of candidate systems before proceeding with additional testing (including laboratory testing and/or field testing). Unfortunately, the standard ACT tests have been shown to inaccurately predict the performance of coatings in real service conditions. Moreover, utilizing ACT during preliminary robin testing could lead to inaccurate rankings.

This paper aims to comment on common ACT methods and their accuracy, and to identify those ACT methods that, with additional development, could more realistically mimic service environments, and therefore more accurately predict long-term performance. Additionally, this work describes testing on coatings used for both internal and external coating of pipelines. Of particular interest, the specific ranking between mechanical testing and corrosion testing will be discussed.

Keywords: Coatings, Coatings Testing, Accelerated Testing, Accelerated Corrosion Testing, Corrosion Testing, Internal Pipeline Coatings, External Pipeline Coatings, Pipeline(s), EIS