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題名 | 應用定量電磁超音波於長途管線出土段管線腐蝕之檢測=Application of Quantitative Electromagnetic Ultrasonic Testing on Onshore Transmission Pipeline Corrosion Inspection |
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作者 | 李秉鴻; 黃啟貞; 涂仁宗; 王順泰; Lee, Ping-hung; Huang, Chi-jen; Tu, Jen-tsung; Wang, Shun-tai; |
期刊 | 石油季刊 |
出版日期 | 20170600 |
卷期 | 53:2 2017.06[民106.06] |
頁次 | 頁101-111 |
分類號 | 440.12 |
語文 | chi |
關鍵詞 | 定量電磁超音波; 管內PIG; 管支撐腐蝕; 長途管線; QEUT; Internal PIG; Pipe support corrosion; Buried pipe; |
中文摘要 | 工業管線在石化、煉油、鋼鐵與發電產業扮演著相當重要的角色,長途管線分佈於工場場區內負責運送原物料、製程所需物料及產物,若管線安全性管理不當,引起洩漏或爆炸都將造成巨大的人力物力損失,更嚴重者將引起難以挽回的工安事故。在台灣由於2014年埋地管線的失效造成高雄氣爆的發生,過去兩年來,埋地管線安全性更是要求的重點,因此長途埋地管線便規劃定期採用管內PIG進行管線狀況之評估,當PIG定位出管線腐蝕發生之位置為埋地管線中的出土段管支撐時,由PIG檢測結果可得知腐蝕區管壁剩餘最小厚度,若腐蝕狀況屬於仍可使用之條件,便會將管線抬高在表面除鏽後進行防蝕材料包覆,以降低管支撐部位腐蝕速率。然而防蝕包覆材料若有劣化,管支撐腐蝕速率便會加快,在下次進行管線全面PIG檢測之前,急需一項檢測方法可提供具防蝕包覆支撐座之腐蝕深度監測。電磁超音波可在管線上產生傳遞約1~2公尺仍具非頻散特性之水平剪力波(SH0)模式,針對管支撐腐蝕,本文乃以磁制伸縮式電磁超音波原理建立一套定量電磁超音波技術(QEUT),經由現場切管腐蝕在PIG所量測之剩餘壁厚與定量電磁超音波檢測之結果相互比對之下,QEUT誤差在腐蝕深度20%範圍內。長途管線管內PIG檢測花費成本高,因此5年方施作一次管線整體性檢測,在PIG檢測周期之間若欲監控過河段或出土段管支撐腐蝕狀況,QEUT技術方案可在較低的成本下,同時完成管線本體腐蝕快篩以及檢測出支撐座腐蝕程度,為管線安全的管理提供一項解決方案。 |
英文摘要 | Thousands of miles pipelines used in the infrastructure of many industries such as power generation, petrochemical plants, oil and gas refineries, are exposed to aggressive corrosive environments or subjected to mechanical damage. In Taiwan, according to the explosion by buried pipe leakage, the buried pipe safety is the focus of safety requirements over the past two years. Therefore, the long-range buried pipelines were planned to perform the regular inspection on internal PIG for pipeline assessment of the corrosion condition. Internal PIG technique was able to point out the locations and the remained wall thickness of the corrosions on pipelines. When the corrosion indications located at pipe supports on the river crossing section, the corroded pipe supports would be evaluated for usability for service. For an passed result, the corrosion would still stay on the pipe support but be insulated by anti-corrosion materials to reduce the corrosion rate. However, if the anti-corrosion material is deteriorated, the corrosion rate of the steel pipe will be accelerated and the inspection of the pipe support corrosion under anti-corrosion insulation is more difficult. Before performing the next internal PIG inspection program, a non-dispersive guided wave SH0 mode generated by magnetostrictive Electromagnetic Acoustic Transducers (EMATs) is used to monitoring pipe support corrosion under insulation as well as to perform quantitative analysis of the maximum depth of the corrosion. The comparison between the remaining wall thickness measured by internal PIG technique and by quantitative electromagnetic ultrasonic testing (QEUT) was discussed in this study. The measured error of the corrosion depth by QEUT is less than 20% Corrosion size was estimated by measuring the amplitude of echoes reflected from the corrosion under attenuated insulation with 500 mm long. The results show that the non-dispersive SH0 mode can propagate through the attenuated insulation and perform the corrosion inspection in this inaccessible area. A good inspection program for long-range buried pipe in river crossing section is the combination of internal PIG technique in 5 years and QEUT inspection every year. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。