volumetric scanning for external corrosion measurement
TRANSCRIPT
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Volumetric Scanningfor
External Corrosion Measurement
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Problem Identification
L1
L2
L3
L1 , 2
L1
L2
L3
L1 , 2
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General CorrosionProblem Identification
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AA0
L
t
⎥⎥⎥⎥
⎦
⎤
⎢⎢⎢⎢
⎣
⎡
−
−×=
−1
0
0
1
1
MAA
AA
SS f
Sf = Failure StressS = Yield StressA = Metal loss areaA0 = Original areaM = Folias factor f (L,D,t)t = Wall thicknessL = Defect length
Failure Stress Determination
External Corrosion
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Corrosion Dimension Measurements
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Worst Depth Profile
Corrosion Dimension Measurements
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Corrosion Dimension Measurements
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General goals
1. Depth resolution: 0.1 mm (less than 1% in a 0-13 mm range)
2. Surface density of measured points: 1 point each 10 mm2
3. Automated data acquisition
4. Automated data analysis and evaluation according to standard procedures
Design a device to measure external corrosion in Ø 30” pipelines.
5. Surface to be analyzed: 80° x 1.000 mm
72.000
60.000
48.000
Points to be obtained
400 (17 days)7.2 x 10536
333 (14 days)6.0 x 10530
267 (12 days)4.8 x 10524
Equivalent inMan-hours *
Developed area(mm2)
Diameter(inches)
* Considering 20 sec for measuring one point and downloading it to an analysis center.
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Comisión Nacional de Energía AtómicaCentro Atómico Bariloche (CAB)
Instituto BalseiroS.C. de Bariloche
Argentina
Comisión Nacional de Energía AtómicaCentro Atómico Bariloche (CAB)
Instituto BalseiroS.C. de Bariloche
Argentina
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Laser sensor
Final design
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Scanner Technical SpecificationsScanner Technical Specifications
• Analyzed surface 80° x 1000 mm on a 30” pipe (530 mm x 1000 mm developed area)
• Scanned points 1 line each 3 mm, 176 lines in developed area1 point every 0.95 mm traveled in axial direction, 1052 points per line
• Measurement Density 1 point each 2.85 mm2, 3.5 points in 10 mm2
• Depth resolution precision: 0.1 mm
• Scanning 5 min, full automatic; wireless data acquisition
• Software One touch control, simple, friendly, on line scanning observation
• Presentation Depth sensitive color presentation with cross section views
• Data handling {x,y,z} data in selected point on graph, zoom in/out, spot size, depth filtering, data exportation to coded files, basic report
• Optional data analysis Analysis according standards (RSTRENG), measurement & analysis reports
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On Field Device Test
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Results on real 30” pipeResults on real 30” pipeAs measured
10.3 mm
20.3 mm
Rel
ativ
e de
pth
Corrosion Measurement
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As measured, pipe deformation (axial and transversal)(top) axial cross section view(left) transverse cross section view, in point {x,y} = {516 mm, 336 mm}
Results on real 30” pipeResults on real 30” pipe
10.3 mm
20.3 mm
Rel
ativ
e de
pth
Corrosion Measurement
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Image after automatic surface pipe identification and correction(note flat surface on both axis projections)
0.34 mm thick adhesive strip intentionally glued on pipe
0.34 mm thick magnetic face-like figure intentionally fixed on pipe surface
Results on real 30” pipeResults on real 30” pipe
-0.56 mm
6.45 mm
Abs
olut
e de
pth
Corrosion Measurement
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Zoom view of a defect
Abs
olut
e de
pth
-0.56 mm
6.45 mm
Abs
olut
e de
pth
Results on real 30” pipeResults on real 30” pipe
Corrosion Measurement
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0.00 mm
6.45 mm
Abs
olut
ede
pth
Corrosion MeasurementAutomatic Automatic DDefectefect Identification According Identification According to International to International StandardsStandards
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Automatic cluster identification according selected interaction rule (∆x, ∆y), 1x1 or 2x2
Abs
olut
e de
pth
(top cross section view) axial projection of deeper points of selected cluster.Red painted zone is the defect effective length according to RSTRENG analysis of this cluster.
Automatic Automatic DDefectefect Identification According Identification According to International to International StandardsStandardsCorrosion Measurement
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Analysis results of selected cluster
Abs
olut
e de
pth
Corrosion MeasurementAutomatic Automatic DDefectefect Identification According Identification According to International to International StandardsStandards