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. Attached Files Name Description MIMEType Size Downloads 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 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 Collections: School of Engineering Institute for Frontier Materials Related Links Link Description Publisher URL Go to link with your DU access privileges     Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved. Versions Version Filter Type Fri, 29 May 2015, 14:22:36 EST Fri, 29 May 2015, 14:23:41 EST Sat, 30 May 2015, 05:02:17 EST Sat, 30 May 2015, 06:10:22 EST Fri, 05 Aug 2016, 13:31:42 EST Fri, 05 Aug 2016, 13:32:38 EST Mon, 29 Aug 2016, 12:43:33 EST Wed, 12 Oct 2016, 13:46:35 EST Wed, 01 Mar 2017, 07:07:55 EST Tue, 08 May 2018, 12:19:13 EST Filtered Full Citation counts:   Cited 0 times in TR Web of Science Cited 0 times in Scopus Search Google Scholar Access Statistics: 194 Abstract Views, 3 File Downloads  -  Detailed Statistics Created: Fri, 29 May 2015, 14:23:41 EST

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