Direct Assessment & Guided Wave Testing

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What is sensitivity? • It is the percent cross sectional area that can be detected at a given signal to noise ratio (SNR) • It is expressed as % ECL or CSC (change in cross-sectional area) SLIDE 50
Things to Consider about Sensitivity • DAC: Distance amplitude curve is expressed as percentage of cross sectional area. Weld DACs are usually 23% ECL. • S/N Over Background: To have better confidence level a S/N ratio of 2:1 is needed. Noise DAC = ½ Call DAC • Inspection Range: Is a function of required Sensitivity. PHMSA (18 points require) 5% sensitivity or value corresponding to a defect that would fail a Hydrotest, whichever is less SLIDE 51
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 and 48: Decay of the amplitude is caused by
Page 49: Amp (Linear) 25.0 20.0 15.0 10.0 5.
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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