2008-11-spetsneftegaz
TRANSCRIPT
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“NPO SPETSNEFTEGAZ”
Efficient Ways of Increasing In-Line Inspection Reliability
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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
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Quantitative Statistics on Types of Detected Defects
Cracks Girth weld anomalyDents Anomaly and mill defectPitting General CorrosionCircumferential groove Axial groovePinhole
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Main Disadvantages of MFL method
• High magnetization level
• Estimation of defect severity level strongly
depends on pipeline defect identification
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High magnetization level
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High magnetization level
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High magnetization level
• Active electronic bypass (speed control) device
V = 0
V = 4 m/s
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High magnetization level
• Advantages of ordinary SNG ILI tools
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High magnetization level
• Alternative magnetization scheme
Very high friction
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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
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Comparison of ILI technologies detection of cracks
with superimposed general corrosion
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Photo of cracks on corrosion background
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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%
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“NPO SPETSNEFTEGAZ”
Advantages of EMAT In-Line Inspection
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EMAT in-line inspection
Pipe
Coating
EMA system
Waves
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Artificial crack signals
EМАТ
TFI
CrackHole
Length 41 mmDepth 4 mmWidth 0.01 mm
Crack
Hole
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EMAT in-line inspection
EМАТ
TFI
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EMAT in-line inspection experience
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EMAT in-line inspection experience
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EMAT in-line inspection experience
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EMAT in-line inspection challenge
• Cracks with nearly zero opening– Detection– Identification– Sizing
• Thick pipe wall corrosion damage– Detection– Identification– Sizing