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Efficient Ways of Increasing In-Line Inspection Reliability

Efficient Ways of Increasing In-Line Inspection Reliability. Statistics of In-Line Inspection of GAZPROM pipelines during the last 5 years. Total 77,900 km gas pipelines were inspected in “GAZPROM” JSC More than 1.5 million pipeline defects were detected

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Efficient Ways of Increasing In-Line Inspection Reliability

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  1. Efficient Ways of Increasing In-Line Inspection Reliability

  2. Statistics of In-Line Inspection of GAZPROM pipelines during the last 5 years • Total 77,900 km gas pipelines were inspected in “GAZPROM” JSC • More than 1.5 million pipeline defects were detected • 6947 stress corrosion cracking zones were located and sized

  3. Quantitative Statistics on Types of DetectedDefects

  4. Main Disadvantages of MFL method • High magnetization level • Estimation of defect severity level strongly depends on pipeline defect identification

  5. High magnetization level

  6. High magnetization level

  7. High magnetization level • Active electronic bypass (speed control) device • V = 0 • V = 4 m/s

  8. High magnetization level • Advantages of ordinary SNG ILI tools

  9. High magnetization level • Alternative magnetization scheme Very high friction

  10. Disadvantages of MFL method • In-line inspection of pipelines with thick walls is limited due to necessity to magnetize full pipe wall thickness up to outer pipe wall surface • All new Russian pipelines including Nord-Stream pipeline are thick wall pipelines • Only limited inspection is possible on almost all offshore pipelines

  11. Comparison of ILI technologies detection of cracks with superimposed general corrosion

  12. Photo of cracks on corrosion background

  13. Pipeline defects identification statistics • Dig verification statistics reveals real ILI tool sensitivity • Latest results of MFL &TFI methods usage: • POD of cracks less than 20% p.w.t. deep is 90% • POI of cracks less than 20% p.w.t. deep is 90% • POI of shallow cracks with superimposed tiny corrosion is less than 60%

  14. Advantages of EMAT In-Line Inspection

  15. EMAT in-line inspection Pipe Coating Waves EMA system

  16. Artificial crack signals Hole Crack Hole Crack TFI Length 41 mm Depth 4 mm Width 0.01 mm EМАТ

  17. EMAT in-line inspection TFI EМАТ

  18. EMAT in-line inspection experience

  19. EMAT in-line inspection experience

  20. EMAT in-line inspection experience

  21. EMAT in-line inspection challenge • Cracks with nearly zero opening • Detection • Identification • Sizing • Thick pipe wall corrosion damage • Detection • Identification • Sizing

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