Post on 10-Aug-2020
1 © 2018 Lavender International NDT USA, LLC. All rights reserved
tim@lavender-ndt.com
TULA TECHNIQUEINNOVATION TO SOLUTION
Tim Armitt: Lavender InternationalDavid Miller: Lavender International
Innovation, Application, Validation & SolutionThe Complete NDT Inspection Support Organisation
™
2 © 2018 Lavender International NDT USA, LLC. All rights reserved
• TOFD found to be most reliable at detecting early stage HTHA
• Conventional TOFD approach extremely useful on welds
• Conventional TOFD limited by large PCS values on thick material
• Lateral wave dead zone another limitation
TULA INSPIRATION
3 © 2018 Lavender International NDT USA, LLC. All rights reserved
• Innovative solution needed• TULA™: TOFD Ultra Low Angle • TULA™ originally developed by
carving up standard TOFD wedges to produce extremely low refracted angles
• Prototypes were developed in partnership with GB Inspection Systems Ltd.
• TULA™ series made including a new angle beam series to be launched later this year.
INNOVATION
TULA™ patent pending all rights reserved
6 © 2017 Lavender International NDT USA, LLC. All rights reserved
BLIND FLANGE SUMMARY: SAMPLE Z1
Velocity RatioAttenuationSpectral FrequencyAUBTPAUTTOFDTFMTULA
No HTHAIndicative of HTHAIndicative of HTHAIndicative of HTHAIndicative of HTHAIndicative of HTHAIndicative of HTHAIndicative of HTHA
Metallography: Colony of HTHA
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BLIND FLANGE SAMPLE Z1: METALLOGRAPHY
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ASSESSMENT OF PARENT PLATE: TULA™ C
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ASSESSMENT OF PARENT PLATE: SUMMARY
Velocity RatioAttenuationSpectral FrequencyAUBTPAUTTOFDTFMTULA
Indicative of HTHAIndicative of HTHAIndicative of HTHAIndicative of HTHAIsolated indicationsLocalised inclusionsIsolated indicationsLocalised inclusions
Metallography: Not HTHA
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ASSESSMENT OF PARENT PLATE: METALLOGRAPHY
Original steelmaking inclusions
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HYDROGEN INDUCED COLD CRACKING: HICC
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TUBE PLATE SAMPLE: TULA™ A IMAGES
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TUBE PLATE SAMPLE: SUMMARY
Velocity RatioAttenuationSpectral FrequencyAUBTPAUTTOFDTULA
Isolated points of HTHA Indicative of HTHA Indicative of HTHA Indicative of HTHA Indicative of HTHA Indicative of HTHA Indicative of HTHA
Metallography: Colony of HTHA
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TUBE PLATE SAMPLE: MICRO VALIDATING NDE
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HEAT EXCHANGER SKID BAR ATTACHMENT WELD TO SHELL HAZ
Crack top tips visible full length of can 3
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HEAT EXCHANGER SKID BAR HTHA CRACKING
Colony of micro cracksTip of 3mm HTHA crack
21 © 2017 Lavender International NDT USA, LLC. All rights reserved
HEAT EXCHANGER SKID BAR ATTACHMENT WELD TO SHELL HAZ
NDT validated by metallography
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NOZZLE SECTION: TULA™ A & C
Sample removed for sectioning
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OD NOZZLE SECTION: TULA™ A
HTHA detected using 10MHz TULA probe, infinity focus, imaging very fine damage
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ID NOZZLE SECTION: TULA™ C
HTHA detected best from ID using focussed TULA probe
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VALIDATION OF TULA™ INDICATIONS
Small manganese sulphide inclusions surrounded by incipient HTHA damage (methane voids)
27 © 2018 Lavender International NDT USA, LLC. All rights reserved
• Lavender International have developed an HTHA training course.
• Course syllabus addresses HTHA detection using ultrasonic techniques
• Techniques include TULA, TOFD, PAUT, FMC/TFM, AUBT and AUT
• Course is recognised by the main oil companies and JIP sponsors
• Lavender International continue to push the limits of how small initial stages of HTHA damage can be detected
• R&D work continues, validation of NDE achieved by metallography
HTHA TRAINING COURSES
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HTHA COURSES: NOW RUN FOR MORE THAN 14 MONTHS
HTHA training courses were audited by prime oil companies.Courses now endorsed by all major oil companies mandating techs to have passed the Lavender course before being permitted to perform HTHA inspections.Grading very stringent: False call = fail. Miss HTHA = fail.
29 © 2018 Lavender International NDT USA, LLC. All rights reserved
• TULA™ approach has been proven to a very simple but highly sensitive means of detecting HTHA
• TULA™ scan speed far exceeds PAUT & TFM• TULA™ probes with specific focal depths
are required to optimise detection throughout a range of thickness
• TULA concept has also been applied to angle beam probes for the purpose of detecting HTHA in weld HAZ regions
• Operator training is essential for choice of parameters, equipment set-up and reliable data analysis
• HTHA training courses are available and proven to be a great success
SUMMARY
30 © 2018 Lavender International NDT USA, LLC. All rights reserved
Innovation, design and solutions: Lavender International NDT Ltd.+44-1226-765-769
Probe design and build:GB Inspection Systems+44 121-351-5025
Scanner design and build:Jireh Industries Houston+1-832-564-0626
JIP Manager & Materials ExpertsEquity Engineering IncMike Nugent +1-201-446-6693
ACKNOWLEDGEMENTS
TULA™ patent pending all rights reserved