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51318-11719-Investigation and case study of composite repair performance at low temperatures on buried pipelines

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Impact of exposure to a low temperature environment below -30oC (-22oF) was investigated on a carbon fiber and epoxy composite repair system that had previously been qualified to the ASME(1) PCC-21 Article 4.1 nonmetallic repair standard.

Product Number: 51318-11719-SG
Author: Tim Mally / Eric Locke / Mahdi Kiani / Roger Walker
Publication Date: 2018
Industry: Pipelines, Tanks, and Underground Systems
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Composite repair systems composed of carbon fiber/epoxy composite materials can be affected by exposure to harsh environments. The vast majority of testing on composite repair systems to date has been to investigate the effects of high temperatures on composite performance. However, depending on the location and time of year, low temperatures can also play a big role in the performance of coatings and composite repairs on pipelines. Therefore, the effects of low temperature should also be tested to prove the reliability of the composite repair systems in low temperature environments. In response to this concern, the impact of exposure to a low temperature environment below -30oC (-22oF) was investigated on a carbon fiber and epoxy composite repair system that had previously been qualified to the ASME(1) PCC-21 Article 4.1 nonmetallic repair standard. Tensile tests were performed in accordance with ASTM(2) D30392, and 5 J impact and burst tests were performed in accordance with ASME PCC-21 Article 4.1 at temperatures below -30oC (-22oF). Based on the results of the testing, it can be concluded that the specific composite repair system can be employed for low temperature applications on buried pipelines and that there is no degradation in the repair system performance. To prove that the results of the testing apply to the field, the composite repair systems were successfully applied to buried transmission pipelines in cold temperatures, the details of which will be presented.

Key words: Pipeline integrity, composite repair, composite wrap, carbon fiber, epoxy, low temperature, cold environments, anomaly repairs

Composite repair systems composed of carbon fiber/epoxy composite materials can be affected by exposure to harsh environments. The vast majority of testing on composite repair systems to date has been to investigate the effects of high temperatures on composite performance. However, depending on the location and time of year, low temperatures can also play a big role in the performance of coatings and composite repairs on pipelines. Therefore, the effects of low temperature should also be tested to prove the reliability of the composite repair systems in low temperature environments. In response to this concern, the impact of exposure to a low temperature environment below -30oC (-22oF) was investigated on a carbon fiber and epoxy composite repair system that had previously been qualified to the ASME(1) PCC-21 Article 4.1 nonmetallic repair standard. Tensile tests were performed in accordance with ASTM(2) D30392, and 5 J impact and burst tests were performed in accordance with ASME PCC-21 Article 4.1 at temperatures below -30oC (-22oF). Based on the results of the testing, it can be concluded that the specific composite repair system can be employed for low temperature applications on buried pipelines and that there is no degradation in the repair system performance. To prove that the results of the testing apply to the field, the composite repair systems were successfully applied to buried transmission pipelines in cold temperatures, the details of which will be presented.

Key words: Pipeline integrity, composite repair, composite wrap, carbon fiber, epoxy, low temperature, cold environments, anomaly repairs

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