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51312-01474-HLPs study on HIC evaluation method in mildly sour environments for high strength line pipe steel

Picture for HLPs study on HIC evaluation method in mildly sour environments for high strength line pipe steel
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Product Number: 51312-01474-SG
ISBN: 01474 2012 CP
Author: Kenji Kobayashi
Publication Date: 2012
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In oil and gas fields containing hydrogen sulfide (H2S) Hydrogen Induced Cracking (HIC) of linepipe steel is a serious problem. In order to select the optimal materials applied for fit-for-purpose (FFP) conditions the appropriate evaluation methods and acceptance criteria of HIC are very important. In this study HIC tests were performed in both full-sided exposure test according to conventional NACE TM0284 and 1-sided exposure test which represent actual applied condition. The test solutions were acetic acid buffer solutions. The partial pressures of H2S were ranged from 0.001 to 0.1 MPa. From the test results absorbed hydrogen contents of 1-sided exposure tests were half as much as those of full-sided exposure tests. The decrease in H2S partial pressure decreased absorbed hydrogen contents. On the other hand HIC susceptibility strongly depended on the absorbed hydrogen content. Thus it is suggested that appropriate acceptance criteria of HIC corresponding to actual applied condition can be derived from making a comparison between the HIC test results of full-sided exposure tests and those of 1-sided exposure tests. By using this comparison acceptance criteria of HIC under full-sided exposure could be estimated.
In oil and gas fields containing hydrogen sulfide (H2S) Hydrogen Induced Cracking (HIC) of linepipe steel is a serious problem. In order to select the optimal materials applied for fit-for-purpose (FFP) conditions the appropriate evaluation methods and acceptance criteria of HIC are very important. In this study HIC tests were performed in both full-sided exposure test according to conventional NACE TM0284 and 1-sided exposure test which represent actual applied condition. The test solutions were acetic acid buffer solutions. The partial pressures of H2S were ranged from 0.001 to 0.1 MPa. From the test results absorbed hydrogen contents of 1-sided exposure tests were half as much as those of full-sided exposure tests. The decrease in H2S partial pressure decreased absorbed hydrogen contents. On the other hand HIC susceptibility strongly depended on the absorbed hydrogen content. Thus it is suggested that appropriate acceptance criteria of HIC corresponding to actual applied condition can be derived from making a comparison between the HIC test results of full-sided exposure tests and those of 1-sided exposure tests. By using this comparison acceptance criteria of HIC under full-sided exposure could be estimated.
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