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Guided Wave Testing on Insulated
Overhead Pipeline Corrosion
Lee Ping Hung
Taiwan Metal Quality Control Co. Ltd
Tel. 07-80...
Guided Wave Testing, GWT
GWT Ring
Pipe corrosion
2016/10TMQC in CNDT20162
Local Corrosion
General Corrosion
Guided Wave Propagation Beyond Elbow
2016/10TMQC in CNDT20163
T(0,1)
Incident
T(0,1)
Focusing
T(0,1)
Reflection
T(0,1)
Tra...
Guided Wave Testing on Insulated Overhead
Pipeline Corrosion
2016/10TMQC in CNDT20164
 Testing on both vertical
section
...
GWT signals of pipe support beyond the
elbow on overhead pipeline
2016/10TMQC in CNDT20165
Wave Propagation at Pipe Support and Elbow
2016/10TMQC in CNDT20166
Reflection
Transmission
Wave Leakage
Pipe Support Pipe...
Research in 2012 CNDT conference
2016/10TMQC in CNDT20167
Frequency: 20~30kHz
-Guided Wave Focusing
-Sensitivity higher th...
2014
Guided wave natural focus map at elbow
2016/10TMQC in CNDT20168
Intrado
Extrado
2014
Guided wave natural focus map beyond elbow
2016/10TMQC in CNDT20169
Extrado
Intrado3 o’clock
9 o’clock
2014
Guided wave natural focus map beyond elbow
2016/10TMQC in CNDT201610
3 o’clock
9 o’clock
GWT signal of Overhead Pipeline without
Corrosion
2016/10TMQC in CNDT201611
-25.0 -20.0 -15.0 -10.0 -5.0 0.0
0.0
0.5
1.0
1...
GWT signal of Overhead Pipeline with
Corrosion
2016/10TMQC in CNDT201612
-20.0 -15.0 -10.0 -5.0 0.0
0.0
1.0
2.0
3.0
-20.0 ...
Multi-frequency Analysis: GWT signal of
Overhead Pipeline with Severe Corrosion
2016/10TMQC in CNDT201613
-12dB
-14.0 -12....
GWT signal collected from the ring location
on horizontal section
2016/10TMQC in CNDT201614
-18dB
-4.0 -2.0 0.0 2.0 4.0 6....
Corrosion X1,X2 surface VT after polishing
2016/10TMQC in CNDT201615
X1
Multiple holes
X2
Multiple severe corrosion
Conclusion
Pipeline Type
Simple support √ x
Welded support √ √
Clamp support √ √
Simple support √ x
Welded support √ √
Cla...
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Guided wave testing on insulated overhead pipeline for CUI

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For overhead pipeline, guided wave testing (GWT) was used to detect the severe corrosion under insulation.

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Guided wave testing on insulated overhead pipeline for CUI

  1. 1. Guided Wave Testing on Insulated Overhead Pipeline Corrosion Lee Ping Hung Taiwan Metal Quality Control Co. Ltd Tel. 07-8019312, 8019340 Fax. 07-8063017 WEB: www.tmqc.com.tw 1 2016/10TMQC in CNDT2016
  2. 2. Guided Wave Testing, GWT GWT Ring Pipe corrosion 2016/10TMQC in CNDT20162 Local Corrosion General Corrosion
  3. 3. Guided Wave Propagation Beyond Elbow 2016/10TMQC in CNDT20163 T(0,1) Incident T(0,1) Focusing T(0,1) Reflection T(0,1) Transmission T(0,1) Reflection T(0,1) Mode Conversion
  4. 4. Guided Wave Testing on Insulated Overhead Pipeline Corrosion 2016/10TMQC in CNDT20164  Testing on both vertical section  Testing on Horizontal section
  5. 5. GWT signals of pipe support beyond the elbow on overhead pipeline 2016/10TMQC in CNDT20165
  6. 6. Wave Propagation at Pipe Support and Elbow 2016/10TMQC in CNDT20166 Reflection Transmission Wave Leakage Pipe Support Pipe Elbow Wave Natural Focusing
  7. 7. Research in 2012 CNDT conference 2016/10TMQC in CNDT20167 Frequency: 20~30kHz -Guided Wave Focusing -Sensitivity higher than 2~3 times Easy to miss corrosion detection Natural focusing is depended on the wave mode, frequency and location According to the difference of the sensitivity, it needs modify the severity of the GWT signal. Next Step:How to get a reliable analysis beyond elbow
  8. 8. 2014 Guided wave natural focus map at elbow 2016/10TMQC in CNDT20168 Intrado Extrado
  9. 9. 2014 Guided wave natural focus map beyond elbow 2016/10TMQC in CNDT20169 Extrado Intrado3 o’clock 9 o’clock
  10. 10. 2014 Guided wave natural focus map beyond elbow 2016/10TMQC in CNDT201610 3 o’clock 9 o’clock
  11. 11. GWT signal of Overhead Pipeline without Corrosion 2016/10TMQC in CNDT201611 -25.0 -20.0 -15.0 -10.0 -5.0 0.0 0.0 0.5 1.0 1.5 2.0 2.5 -25.0 -20.0 -15.0 -10.0 -5.0 0.0 0.0 0.5 1.0 1.5 2.0 2.5 Distance (m) B3W2S1W1B2B1 B4B3W2S1W1B2
  12. 12. GWT signal of Overhead Pipeline with Corrosion 2016/10TMQC in CNDT201612 -20.0 -15.0 -10.0 -5.0 0.0 0.0 1.0 2.0 3.0 -20.0 -15.0 -10.0 -5.0 0.0 0.0 1.0 2.0 3.0 Distance (m) -F1B5 B6X1 W3 B8-F1B7X2X3W3B6
  13. 13. Multi-frequency Analysis: GWT signal of Overhead Pipeline with Severe Corrosion 2016/10TMQC in CNDT201613 -12dB -14.0 -12.0 -10.0 -8.0 12 9 6 3 12 Clock -14.0 -12.0 -10.0 -8.0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 Distance (m) B6 X1 W3 -12dB -14.0 -12.0 -10.0 -8.0 12 9 6 3 12 Clock -14.0 -12.0 -10.0 -8.0 0.0 1.0 2.0 3.0 Distance (m) Amp(Linear) B6 X1 W3 45kHz 30kHz
  14. 14. GWT signal collected from the ring location on horizontal section 2016/10TMQC in CNDT201614 -18dB -4.0 -2.0 0.0 2.0 4.0 6.0 12 9 6 3 12 Clock -4.0 -2.0 0.0 2.0 4.0 6.0 0.0 2.0 4.0 6.0 8.0 10.0 12.0 Distance (m) Amp(Linear) B7X2X3W3X1B6 Bottom Corrosion
  15. 15. Corrosion X1,X2 surface VT after polishing 2016/10TMQC in CNDT201615 X1 Multiple holes X2 Multiple severe corrosion
  16. 16. Conclusion Pipeline Type Simple support √ x Welded support √ √ Clamp support √ √ Simple support √ x Welded support √ √ Clamp support √ ∆ 2016/10TMQC in CNDT201616 √: Need GWT,x: No need GWT,∆: Depend on contact condition PS. If testing results on vertical section show obvious corrosion signal, another testing location should be done in the overhead pipeline inspection results Bare Overhead Pipeline Insulated Overhead Pipeline Pipe Support Type Testing on both vertical section Testing on Horizontal section

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