Direct Assessment & Guided Wave Testing

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Corrosion can also attenuate the sound significantly • Incoming wave (100% of energy) Incoming wave (100% of energy) Reflected wave (20% of energy) Incoming wave (100% of energy) 20% 16% 80% Reflected wave (100% of energy) 64% 13% Transmitted wave (0% of energy) Transmitted wave (80% of energy) 51% SLIDE 48
Amp (Linear) 25.0 20.0 15.0 10.0 5.0 0.0 Four Distance Amplitude Curves (DACs) Weld DAC Call DAC Noise DAC Start of Bend Start of Bend Earth Coal Tar Wrap Coal Tar Wrap Casing Support Support -50 0 Distance (ft) 50 DAC levels can be changed for different applications. Flange DAC: 100% ECL Weld DAC: ~23% ECL Call DAC: 5% ECL (detectability threshold/sensitivity level) Noise DAC: 2.5% ECL (Set to 1/2 detectable threshold) Support Weld Weld SLIDE 49
Page 1 and 2: Scott Riccardella Product Manager T
Page 3 and 4: Direct Assessment (DA) • DA is on
Page 5 and 6: ECDA Documentation • Advocate rig
Page 7 and 8: ECDA: Direct Examinations • Evalu
Page 9 and 10: ECDA Post Assessment • Remaining
Page 11 and 12: Application of ECDA in a Station or
Page 13 and 14: 3-D Geographical Information System
Page 15 and 16: Half Cell Measurements and Mixed Po
Page 17 and 18: APEC Overview • Uses industry sta
Page 19 and 20: Direct Examinations • In difficul
Page 21 and 22: Case Study - Pre-Assessment • Pre
Page 23 and 24: • Results included: Case Study -
Page 25 and 26: APEC Excavation with Sleeve Install
Page 27 and 28: Case Study Conclusions • ECDA wor
Page 29 and 30: Definition Guided Wave - a wave (ac
Page 31 and 32: • Used to detect internal or exte
Page 33 and 34: Guided Wave Concept Propagation alo
Page 35 and 36: Longitudinal Torsional Flexural Wav
Page 37 and 38: GWT EQUIPMENT SLIDE 37
Page 39 and 40: Electronic Control Unit for system
Page 41 and 42: Negative Direction Series of Welds
Page 43 and 44: • Near Field - Region where the g
Page 45 and 46: Shot looks like this when data come
Page 47: Decay of the amplitude is caused by
Page 51 and 52: Things to Consider about Sensitivit
Page 53 and 54: GWT Example Result Defect Defect De
Page 55 and 56: Elbow (71 ft. from GWT Collar) Weld
Page 57 and 58: GWT TECHNOLOGY ADVANCEMENTS SLIDE 5
Page 59 and 60: Frequency Tuning • Most equipment
Page 61 and 62: Passive/Synthetic Focusing • Some
Page 63 and 64: Key Advancements • Breadth in tec
Page 65 and 66: Guided Wave Monitoring (GWM) PowerF
Page 67 and 68: Guided Wave Monitoring (GWM) • A
Page 69 and 70: PAUT Roller Probe • Light-weight,
Page 71 and 72: GWT AND CASINGS (SPECIAL APPLICATIO
Page 73 and 74: Generation of Equipment & Software
Page 75 and 76: Core Components of a GWT Report •
Page 77 and 78: Data Management via GIS (web • In

Direct Assessment & Guided Wave Testing

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