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Experimental and stochastic approaches to assessing the strain demand of pipelines and flexibility requirements for coatings

Michal, Guillaume, Hallifax Ballinger, Thomas, Abreu, Davi and Tan, Mike Yongjun 2013, Experimental and stochastic approaches to assessing the strain demand of pipelines and flexibility requirements for coatings, in 19th Biennial Joint Technical Meeting on Pipeline Research, The Australian Pipeline Industry Association, Barton, ACT, pp. 1-13.

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Title Experimental and stochastic approaches to assessing the strain demand of pipelines and flexibility requirements for coatings
Author(s) Michal, Guillaume
Hallifax Ballinger, Thomas
Abreu, Davi
Tan, Mike YongjunORCID iD for Tan, Mike Yongjun orcid.org/0000-0002-0765-108X
Conference name Pipeline Research. Conference (19th : 2013 : Sydney, NSW)
Conference location Sydney, NSW
Conference dates 29/4/2013- 3/5/2013
Title of proceedings 19th Biennial Joint Technical Meeting on Pipeline Research
Publication date 2013
Start page 1
End page 13
Total pages 13
Publisher The Australian Pipeline Industry Association
Place of publication Barton, ACT
Summary A criterion for selecting a coating for an energy pipeline is that the coating should have a suitable flexibility to meet the high strain demand during hydrostatic testing and during field bending. This requires knowledge of the level of strain demand for the pipeline, and also the maximum strain that could be
tolerated by the coating system. Whereas average strains imposed during manufacturing and construction are reasonably well predicted, there is insufficient understanding on the factors leading to localised deformation of the pipe. Significant work has been carried out in the past to develop tests for assessing
the coatings’ ability to handle a certain amount of strain based on bend testing, tensile testing and burst testing. However, there is a concern as to whether these tests properly represent localised micro-strains associated with construction activities including field bending and pressure testing, particularly pressure testing of pipelines designed for operation at 80% of specified minimum yield strength (SMYS). Consequently coatings considered "suitable" for modern pipelines may fail. The first issue discussed in this paper is main factors affecting strain localisation. The non-deterministic distributions of heterogeneities over the pipe provide a ground to consider the mechanisms of localisation as a stochastic process. An approach is proposed to quantify the maximum localised strain demand through cold field bending and hydrostatic experiments. Another issue discussed in this paper is the experimental assessment of coating flexibility under the effects of localised strains. Preliminary mandrel tests have been carried out to assess the uniformity of the imposed strain. Although mandrel testing has been shown to be a useful method for relative comparison of coating flexibility, it has several weaknesses that could significantly affect the reliability and reproducibility of the results.
Language eng
Field of Research 091207 Metals and Alloy Materials
030604 Electrochemistry
Socio Economic Objective 870302 Metals (e.g. Composites
HERDC Research category E1.1 Full written paper - refereed
ERA Research output type E Conference publication
Copyright notice ©2013, The Australian Pipeline Industry Association
Persistent URL http://hdl.handle.net/10536/DRO/DU:30073547

Document type: Conference Paper
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