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| ON THE SPOT DETECTION AND EVALUATION OF UNDERGROUND PIPELINE COATINGS DEFECTS |
| ;;Shouyan Wang;; |
| 天津大学材料学院 |
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Abstract The quick analysis system for underground pipeline coating detection has been set up. Defect orientation of the system is made by using the dyadic wavelet transform of ON, instant OFF close interval potential survey (CIPS) potential and the difference of them. It is indicated that the extreme values of detail-coefficients of dyadic wavelet transform will increase with the scale at the damaged points otherwise it will decrease with the scale at the other places. With the product of the third layer detail-coefficients and the product of the third layer smoothed-coefficients of those three curves obtained, the damaged points of the coating could be easily found. To diagnose the coating state of the system the wavelte Kohonen neural network is set up. The front layers of the network are corresponding to multiresolution decompositions, which has the ability of picking up the information. The last layer of the model is corresponding to Kohonen neural network, which has the ability of self-training. The coating state can be quickly diagnosed after the galvanostatic transient response is input to the model. The CIPS is used in pilot detection. Then the damaged points of the coating can be made certain by the defect orientation part of the system. The galvanostatic transient response method is used to detect the coating state of buried pipelines at the damaged point. Then the coating state can be judged by the coating state diagnosis part of the system. The detection result of real pipeline between Dagang and Cangzhou of Tianjin Dagang oil field was satisfactorily.
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Received: 17 December 2003
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[1]GaoZhiming,SongShizhe,WangShouyan,etal.Onthespotdetec tionandevaluationmethodofundergroundpipelinecoatingswithelectrochemicaltechnique[J].J .Chem.Indust.Eng.,(accepted)(高志明,宋诗哲,王守琰等.基于小波分析和神经网络的埋地管道防护层现场检测与评价方法[J].化工学报,(待发表)
[2]PerdomoJorgeJ ,SongInho.Cathodicallyprotectingundergroundasphaltenamelcoatedpipes[J].Corros.Reviews,2000,18(2):221-254
[3]SongSZ ,XuYH ,HuJC .Theelectrochemicalimpedancespec troscopyfeatureofcathodicallyprotectedcoatingwithdetachmentordamage[A].TheCorrosionElectrochemistryandIt’sMeasure mentMethodConference[C].Zhangjiajie,1998,11:57-60(宋诗哲,徐云海,胡景超.阴极保护下防护层破损与剥离的阻抗谱特征[A].全国腐蚀电化学及测试方法论文集[C].张家界,1998,11:57-60)
[4]SongSZ ,JinSJ ,SongXP ,etal.Electrochemicalmeasurementsofdefectivecoatingsonburiedsteelsubstrates[J].Electrochemistry,1999,5(2):39-42(宋诗哲,靳世久,宋小平等.土壤中钢铁表面防护层缺陷的电化学检测[J].电化学,1999,5(2):39-42)
[5]GaoZM ,WangSY ,SongSZ .ApplicationofwaveletanalysisandKohonenneuralnetworksforfielddetectionofspotsonunder groundpipelinecoating[J].Crros.Sci.Prot.Technol.,2001,13(Supplement):464-466(高志明,王守琰,宋诗哲.小波分析与Kohonen神经网络方法在的埋地管道防护层现场缺陷现场检测中的应用[J].腐蚀科学与防护技术,2001,13(增刊):464-466
[6]GaoZM ,SongXP ,PangXS ,SongSZ .Theapplicationofwaveletintransientmeasurementofcorrosionelectrochemistry[J].J.Chin.Soc.Corros.Prot.,2001,21(4):245-249(高志明,宋小平,庞兴收,宋诗哲.小波分析在腐蚀电化学瞬态检测中的应用[J].中国腐蚀与防护学报,2001,21(4):245-249
[7]QinQQ ,YangZK .PracticalityWaveletAnalysis[M].Xi′an:Xi′anUniversityPress,1992,14-40(秦前清,扬宗凯.实用小波分析[M ].西安:西安电子科技大学出版社,1992,14-40)
[8]SongXH ,PhilipKH .Kohonenneuralnetworkasapatternrecog nitionmethodbasedontheweightinterpretation[J].AnalyticaChimicaActa,1996,334:57-665 |
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