Guided Wave Testing (GWT)
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1 Guided Wave Testing (GWT) Use of guided wave testing for the detection and monitoring of corrosion under insulation Peter Philipp Independent GWT consultant Level 3 GUL Level 3 PCN GWT BINDT-ICorr. - 12/05/2013
2 This presentation Brief history of GWT How it works How good is it at identifying CUI Monitoring New build considerations Limitations Procedures and training Other GWT applications Future developments BINDT-ICorr. - 10/03/2013
3 GWT History Lamb waves identified in the 1930 s Research projects in the 1990 s Link and Thermie programs Development of dispersion curves Required faster portable computers First commercial equipment available 1999 Mid 2000 s Subsea, focussing, c-scan display, rail, permanently installed etc. 3 GWT systems developed Wavemaker (GUL) Teletest (Pi), MSS (SWRI) BINDT-ICorr. - 10/03/2013
4 Guided Wave Testing Standards ASTM 2011 BSI 9690 parts 1 & 2 TUV certification: GUL GWT procedure certified under EN standard NACE TG /13 ASME Article /13 Need for harmonization between the different standards. Standards within integrated system including legal requirements, codes and best industrial practices..; Guided Ultrasonics Ltd. 12/05/2013 4
5 This presentation Brief history of GWT How it works How good is it at identifying CUI Monitoring New build considerations Limitations Procedures and training Other GWT applications Future developments BINDT-ICorr. - 10/03/2013
6 Principle Transducer Standard UT Metal structure Inspected Area Transducer Ring Guided Waves Inspected area Inspected area BINDT-ICorr. - 10/03/2013
7 Reflection from a Feature (such as corrosion) Transducer Structure When the guided wave hits a change in cross section (or impedance), it reflects back toward the transducer BINDT-ICorr. - 12/05/2013
8 Dispersion curves 6.0 Longitudinal L(0,2) V gr (m/ms) Torsional T(0,1) F(1,2) F(1,3) Black = axi -symmetric modes Red = non-axi -symmetric modes Blue = other modes that are not used by the system BINDT-ICorr. - 12/05/2013
9 Backward Position of Ring Forward Series of Welds Iconic representation of identified features Decay Curves Corrosion is indicated by large red component BINDT-ICorr. - 10/03/2013
10 Guided Waves (Focusing) C-Scan display BINDT-ICorr. - 12/05/2013
11 At every change in cross section there is a reflection of the guided waves Amplitude depends on cross sectional area change The dark grey Section represents the Cross-sectional area BINDT-ICorr. - 12/05/2013
12 Distribution of Loss The percentage loss given by the ECL could be concentrated in a narrow portion of the pipe (e.g. a critical deep defect) could be equally distributed around the circumference (e.g. a shallow wall loss) BINDT-ICorr. - 12/05/2013
13 The ratio of Red to Black depends on the circumferential extent of the feature When the feature does not extend very far around the circumference, RED = BLACK Amplitude Ratio Circumferential Extent (percent) When the feature extends significantly around the circumference, RED << BLACK BINDT-ICorr. - 10/03/2013
14 Axi-Symmetry Displayed as black and red lines BLACK lines represent axi-symmetric waves Uniform around the circumference RED lines represent non-axi-symmetric waves Varies around the circumference A symmetric weld -F4 -F F2 -F1 +F1 +F2 +F3 +F4 A non-symmetric defect Amp (mv) Distance (m) #12403 BINDT-ICorr. - 12/05/2013
15 This presentation Brief history of GWT How it works How good is it at identifying CUI Monitoring New build considerations Limitations Procedures and training Other GWT applications Future developments BINDT-ICorr. - 10/03/2013
16 Why Guided Waves? 100% volumetric coverage Rapid screening In Service inspection Permanent record Significantly reduced access costs Think of costs for: scaffolding, removing insulation, digging, operating underwater BINDT-ICorr. - 10/03/2013
17 Rapid screening Very good at confirming clean pipe Acts as filter: point out areas where more attention is needed Everyone knows about health screening BINDT-ICorr. - 12/05/2013
18 In-service inspection Temperature performances from -40C to 180C the extremes of this range will require modified procedures Product low viscosity fluid does not affect torsional mode frequency range enables good performances in case of viscous fluid Pump noise, product flow signal/noise can be improved using predefined software procedures In some cases (isolated) testing is not feasible BINDT-ICorr. - 12/05/2013
19 Managing pipe inspection Pipeline operators need to deal with kilometres of pipelines (each site) How do operators manage the inspection now? What capabilities are offered by Guided Waves? BINDT-ICorr. - 12/05/2013
20 GWT and other complementary methods Prove up using other NDT methods (UT,RT, Leak detection, etc ) Use with RBI can be very powerful BINDT-ICorr. - 12/05/2013
21 Touch point corrosion 8 Sch Guided Ultrasonics Ltd. 12/05/ dB F Distance (ft) Amp (Linear) Clock Weld welded plate -F1 Weld Cat 1 Corrosion Support Weld Cat 3 Support Weld DAC 14% Call DAC 4% Touch point corrosion patch with pitting
22 Touch point corrosion 12 Sch Pitting touch point corrosion at 6 o clock position of pipe Guided Ultrasonics Ltd. 12/05/ dB Clock Amp (Linear) welded support weld Welded support Contact support Contact support -F1 Welded support Corrosion pit Weld Weld DAC 20% 0.5 Call DAC 3% Distance (m)
23 This presentation Brief history of GWT How it works How good is it at identifying CUI Monitoring New build considerations Limitations Procedures and training Other GWT applications Future developments BINDT-ICorr. - 10/03/2013
24 100% Volumetric coverage What is the probability of finding a defect using UT spot check compared to Guided Waves? BINDT-ICorr. - 12/05/2013
25 100% Volumetric coverage What is the probability of finding a defect using UT spot check compared to Guided Waves? Example: 10 pipe, 12m length with 2 simple supports Per test: Standard UT = 0.027% area coverage Guided Wave ~ 100% area coverage BINDT-ICorr. - 12/05/2013
26 Monitoring using GWT - Advantages Greatly improved sensitivity Normal testing ~ 1% to 5% Monitoring in the order of 10 times better as you are detecting changes Data from all tests can be stored for setting up same test parameters and also for comparison Can use removable or permanently installed transducers Data collection after base can be done by data collectors BINDT-ICorr. - 10/03/2013
27 GW monitoring sensitivity Simple visual 3.0 estimate of change slow 2.0 and sometimes difficult method Amp (Linear) of interpreting 1.0 GWT data differences 0.0 +F1 +F2 0.75% CSC 0.5% CSC baseline Distance (m) 1% CSC Guided Ultrasonics Ltd. - 12/05/
28 Riser monitoring results G3-163#1125 (Linear) Weld Sea bedweld 2008 Result Weld Weld WeldWater levelweld Caisson Flange G3-16#3957 (Linear) Weld Sea bedweld 2009 Result Weld Weld WeldWater levelweld Caisson Flange G3-116#1042 (Linear) Weld Sea bedweld 2010 Result Weld Weld WeldWater levelweld Caisson Flange Distance (m) Guided Ultrasonics Ltd. - 12/05/
29 Riser GW monitoring results: The automatically processed comparisons The yellow trace is the reflection coefficient calculated from the 2010 reading using the calibration curves. The black trace is the difference between the 2010 and baseline readings. Guided Ultrasonics Ltd. - 12/05/
30 Monitoring using GWT Potential problems The accuracy of comparing results must take into account the following: Unique transducer identification Ring position (for removable rings) Calibration Pipe temperature difference Transducer coupling (permanent attachment) Test parameters must be the same Ideally the software should calculate the change BINDT-ICorr. - 10/03/2013
31 This presentation Brief history of GWT How it works How good is it at identifying CUI Monitoring New build considerations Limitations Procedures and training Other GWT applications Future developments BINDT-ICorr. - 10/03/2013
32 Using GWT New build considerations Design for monitoring points especially when using permanently installed transducers For example sub sea and road crossings can be installed and take base line readings Design coatings etc to maximise range (avoid thick bitumastic coatings) BINDT-ICorr. - 10/03/2013
33 This presentation Brief history of GWT How it works How good is it at identifying CUI Monitoring New build considerations Limitations Procedures and training Other GWT applications Future developments BINDT-ICorr. - 10/03/2013
34 Dead zone Cannot test region of pipes close to the ring location Dead zone extending over 0.5m from ring (depends on test configuration) BINDT-ICorr. - 12/05/2013
35 Range meters in each direction depending on local conditions Factors affecting range Geometry General pipe conditions Material inside pipe Attenuative surface coating BINDT-ICorr. - 12/05/2013
36 Difficult geometry Only test through one bend in each direction Defects at branches cannot be found reliably Flanges and Ts represent the end of the test BINDT-ICorr. - 12/05/2013
37 Type of defect More difficult Single isolated pit Axial cracks Small pits in welds Easier A cluster of pits Circumferential cracks Large cracks in welds CORROSION I/E - EROSION BINDT-ICorr. - 12/05/2013
38 This presentation Brief history of GWT How it works How good is it at identifying CUI Monitoring New build considerations Limitations Procedures and training Other GWT applications Future developments BINDT-ICorr. - 10/03/2013
39 GWT Procedures Procedures need to be developed for: Different applications Permanent ring attachment and base test Data collection from permanent rings Comparison of monitoring data Data management BINDT-ICorr. - 10/03/2013
40 GWT operator training and certification The success of GWT is very operator dependant so good training/certification is crucial Some applications are more difficult The main manufacturers have different approach to training/certification PCN agreed by all GWT equipment suppliers available this year CSWIP only available for Teletest BINDT-ICorr. - 10/03/2013
41 Information management Managing information from NDT inspection is major issue. With Guided Waves each result contains in one file information on tens of meters of pipe. New development will enable asset integrity packages linking exact positioning of pipe features and defects (plotted on Google Earth for example) BINDT-ICorr. - 12/05/2013
42 Guided Waves (C-Scan) Unrolled pipe view Angle (deg) F2 -F1 +F1-24dB +F2 +F3 +F5 +F4 2.0 Amp (Linear) BINDT-ICorr. - 12/05/2013
43 Interpretation - Frequency scanning Time saving when collecting data Takes away responsibility from the inspector to choose best frequencies on site More information available which was not visible before when collecting single frequencies Extremely important in applications where the feature response is frequency dependent Helps distinguishing different features (e.g. defects from supports) POD BINDT-ICorr. - 12/05/2013
44 Typical performance on bare straight pipe (20 years old in good conditions) 100 meters range on each side Amplitude detection 1% Cross section Concentration of defect (approximate) Angle definition of defect +-22 degrees Factors reducing range discussed below BINDT-ICorr. - 12/05/2013
45 Applications Rapid, full coverage screening of pipes Especially cost effective in difficult to access locations Pipe racks Corrosion under insulation Road crossings Wall penetrations Rope access Road crossing Buried pipes Can reliably detect general metal loss BINDT-ICorr. - 12/05/2013
46 Effect of Pipe Contents Gases - no effect Liquids Almost no effect on the torsional mode Affects the longitudinal mode when the pipe is fully filled Sludge Heavy viscous deposits in the pipe attenuate the signal and reduce the test range Can be similar effect to bitumen wrapping BINDT-ICorr. - 12/05/2013
47 This presentation Brief history of GWT How it works How good is it at identifying CUI Monitoring New build considerations Limitations Procedures and training Other GWT applications Future developments BINDT-ICorr. - 10/03/2013
48 This presentation Brief history of GWT How it works How good is it at identifying CUI Monitoring New build considerations Limitations Procedures and training Other GWT applications Future developments BINDT-ICorr. - 10/03/2013
49 Future developments Auto monitoring hardware and software Asset integrity packages linking exact positioning of pipe features and defects (plotted on Google Earth for example) Improved buried pipe capability Absolute calibration BINDT-ICorr. - 12/05/2013
50 Other GWT applications Tube testing boilers/heat exchangers Sub sea (diver and ROV deployed Rail Tubular structures Lampposts BINDT-ICorr. - 10/03/2013
51 Sub-Sea Pipe testing BINDT-ICorr. - 10/03/2013
52 G-Scan Rail Screening System BINDT-ICorr. - 10/03/2013
53 Conclusions GWT is a very versatile inspection tool Needs to be used with complementary NDT methods Can save considerable access costs More accurate when used in monitoring mode Has data record of all tests BINDT-ICorr. - 12/05/2013
54 Questions PQS Peter Philipp BINDT-ICorr. - 12/05/2013
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