| CUI Ming-wei,WANG Yuan-yuan,HE Jie,YOU Yang,FENG Zi-yan,ZHANG Yue-ming,ZHANG Shu-qin.Comparison Study on Assessment Methods for Residual Strength of Interaction Corroded Pipeline[J],45(8):56-62 |
| Comparison Study on Assessment Methods for Residual Strength of Interaction Corroded Pipeline |
| Received:April 04, 2016 Revised:August 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.08.010 |
| KeyWord:adjacent corrosion axial spacing interaction residual strength evaluation criterion applicability |
| Author | Institution |
| CUI Ming-wei |
Research Institute of Shaanxi Yanchang Petroleum Group Company Limited, Xi an , China |
| WANG Yuan-yuan |
Oil and Gas Exploration Company of Shaanxi Yanchang Petroleum Group, Yan an , China |
| HE Jie |
Oil and Gas Exploration Company of Shaanxi Yanchang Petroleum Group, Yan an , China |
| YOU Yang |
Research Institute of Shaanxi Yanchang Petroleum Group Company Limited, Xi an , China |
| FENG Zi-yan |
Research Institute of Shaanxi Yanchang Petroleum Group Company Limited, Xi an , China |
| ZHANG Yue-ming |
Research Institute of Shaanxi Yanchang Petroleum Group Company Limited, Xi an , China |
| ZHANG Shu-qin |
Research Institute of Shaanxi Yanchang Petroleum Group Company Limited, Xi an , China |
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| Abstract: |
| Objective To analyze the applicability of existing corrosion evaluation specifications to the calculation of residual strength of interaction corroded pipeline and screen the suitable evaluation specification for the residual strength of interaction corroded pipeline. Methods Seven identification criteria for adjacent corrosion interaction like ASME B31G—91, modified B31G, ASME B31G—2009/2012, RSTRENG method, DNV-RP-F101 method and PCORRC method as well as interaction evaluation methodology were summarized. The applicability of all evaluation methods were analyzed by experimental data. Results ASME B31G—91, modified B31G, ASME B31G—2009/2012 and RSTRENG methods were mostly based on the critical axial spacing. Once over the critical axial spacing, adjacent corrosion interaction did not occur. However the evaluation ideas or way of influence for the adjacent corrosion interaction was not given out. DNV RP-F101 standard clearly put forward the criterion on interaction of adjacent corrosion and proposed the evaluation ideas for evaluation of interaction corrosion. PCORRC method did not explicitly suggest the evaluation ideas. Conclusion The seven corrosion evaluation criteria are all based on the single corrosion pipeline. They are more suitable for the evaluation on single corrosion defect pipeline but conservative for the evaluation on interaction corrosion defects. The interaction criterion of adjacent corrosion defects is too simple with the method of ASME B31G—91, modified B31G, ASME B31G—2009/2012, RSTRENG method, DNV-RP-F101 method and PCORRC method, and the mechanism of the interaction between adjacent corrosion defects is not completely showed. In comparison, the DNV-RP-F101 method is more accurate and less conservative than other methods. |
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