evisivescan - national physical...
TRANSCRIPT
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EvisiveScanTM
Microwave Scanning NDT
Bob Stakenborghs
Evisive General Manager
Level III MW NDT
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Microwave Definition
Evisive 2
Frequencies: 1.6-30 GHz
Wavelengths: 187 - 10 mm
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Microwave inspection Principles of Operation
• Material under inspection is bathed in MW energy of an essentially constant frequency creating a series of standing waves in the object
Evisive 3
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Principles of Operation
Evisive 4
The boundary in this case is any change in relative permitivity (Commonly known as Dielctric Constant) o f the material.
Energy is reflected from each interface of differing relative permitivity within specimen
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Measurement Technique
Evisive 5
B A
Transmitter
¼ λ
The reflected energy is measured and creates a resulting output voltage signal
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Data Collection
Evisive 6
The resulting voltage is sampled at discreet locations across sample to create an image
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Image Creation
Evisive 7
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MW Inspection Overview
• Multiple generations of equipment in the field
• Mechanical inspection devices for:
– HDPE butt fusion and electrofusion joints
– HDPE, FRP pipes and vessels (up to 12 feet in diameter)
– Rubber expansion joints
– Fully battery operated and bluetooth data transfer inspection equipment
• Microwave Inspection accepted as a new technique in ASNT
• ASTM Standards under development
• Microwave represented in ASME BPVC working groups on HDPE
Evisive 8
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Detectable Defect Types
• Disbonds & Lack of Fusion in HDPE Butt Fusion and Electrofusion Thermal Welds
• Foreign Material Inclusions
• Voids
• Moisture or other liquid contamination
• Mechanical damage
• Physical changes due to chemical attack
Evisive 9
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Current Uses
• Fiberglass Tanks and Pipes • Dow • Bayer • Borouge • Shell
• Fiberglass Armor • US Army (SBIR) • Kazak
• Reinforced Rubber Expansion Joints • Exelon • PSEG • FENOC • Wolf Creek
• Ceramic Materials • US Air Force (SBIR)
• HDPE Butt Fusion Joints • Axiall
Evisive 10
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Work In Progress
• Enhanced imaging techniques using Narrow Band Synthetic Aperture Focusing Techniques (SAFT)
– Allow specific depth location
Transition to Wide Band SAFT
– Provide for 3D imaging (holographic) techniques
Evisive 11
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FIRST GENERATION LAB EQUIPMENT
EvisiveScanTM
Microwave Scanning NDT
Evisive 12
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Basic Equipment Setup Laboratory Scan Table
Laboratory Scan Lathe
Evisive 13
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NEW GENERATION FIELD EQUIPMENT
EvisiveScanTM
Microwave Scanning NDT
Evisive 14
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Blue Tooth Hand Held
Evisive 15
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Evisive 16
Pipe Scanner
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Pipe with manufactured defects
Pipe with erosion defects and insufficient glue Inspection image of pipe
17
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Pipe with manufactured defects
Gray scale image showing interference pattern at erosion hole 3D rendering of pipe
18
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3D Rotated view of part
19
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Fiberglass Panel
20
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Thickness determination
21
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MICROWAVE INSPECTION OF GFR
22
EVISIVESCANTM
MICROWAVE SCANNING NDT
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Overloaded section of fiberglass boom
Boom section Inspection image
23
Delamination
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Internal erosion of pipe
24
Displaced structure caused by washout of resin matrix
Localized Pit
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Voiding at manufacture
Boom with voiding Inspection image of boom
25
Voiding identified in inspection image
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Internal pipe hydrolysis
Picture of pipe ID Inspection image of pipe ID
26
Internal blistering identified in image
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Environmental degradation of furan pipe
Photo showing chemical attack Inspection image of chemical attack
27
Degraded resin to right of line
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Resin poor areas of pultruded panel
28
A 1816
B 1217
C 1597
D 1114
Tensile test results (Pounds load to failure)
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Panel with various types of fod
29
Image focus changes based on relative position of the end of the antenna with respect to the material surface
Metal, paper, cloth FOD
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INSPECTION OF STEEL PIPE CORROSION BENEATH FIBERGLASS OVERWRAP
EVISIVESCANTM
MICROWAVE SCANNING NDT
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Corrosion Beneath Fiberglass Overwrap
Figure 1-Corrosion under fiberglass overwrap
• In service inspection of steel pipe corrosion under insulation or overwraps.
• Condition monitoring of pipe over time
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The wrap is hard fiber reinforced layer with
mastic matrix and interlayer fill.
Scan image shows features in pipe surface, at
pipe to wrap interface and in pipe wrap.
Indications inclued artificial and unintended
features.
Pipe Wrap with Artificial Defects
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Pipe wrap with artificial defects. The wrap is flexible fiber material with a resin matrix. Microwave interference scan of pipe wrap showing features in pipe surface, at pipe to interface and in pipe wrap volume. Indications include artificial and unintended features.
Pipe Wrap with Artificial Defects
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Outside end Inside end
Outside
end again
circumference
Good bond / whole area
Clockspring Inspection
Crack
Strong indication, likely disbond at metal surface
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Section at
x = 8 in.
Clockspring inspection
Good Bond
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Section at
x = 18 in.
Clockspring inspection
Corrosion/
Delamination at pipe surface
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Section at
x = 29 in.
Clockspring inspection
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THICKNESS MEASUREMENT
Evisive 38
EVISIVESCANTM
MICROWAVE SCANNING NDT
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Thickness Measurement
Evisive 39
B
A
Transm
itter
¼ λ
0
-2
B
A
Transm
itter
¼ λ
+
2
-1
B
A
Transm
itter
¼ λ
+
0
+
1
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Phase Plot
-1.5
-1
-0.5
0
0.5
1
1.5
-1.5 -1 -0.5 0 0.5 1 1.5
Ch
B
Ch A
Evisive 40
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Calibration Panel
Evisive 41
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Phase & Magnitude Application
Evisive 42
Wedge used to correlate thickness to color
Thicker area
Area with wall loss
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Wall loss = .150”
Wall Loss=.050”
Wall Loss = .155”
Wall Loss = .060”
Fiberglass Panel
Evisive 43
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Inspection Image
Evisive 44
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3D Representation
Evisive 45
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Evisive 46
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QUESTIONS?
EvisiveScanTM
Microwave Scanning NDT