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1 © 2018 Lavender International NDT USA, LLC. All rights reserved

[email protected]

TULA TECHNIQUEINNOVATION TO SOLUTION

Tim Armitt: Lavender InternationalDavid Miller: Lavender International

Innovation, Application, Validation & SolutionThe Complete NDT Inspection Support Organisation

™


• 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


• 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


VALIDATION

Blind Flange Section


BLIND FLANGE TULA™ : SAMPLE Z1


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


BLIND FLANGE SAMPLE Z1: METALLOGRAPHY


ASSESSMENT OF PARENT PLATE: TULA™ C


JIP PHASE 1 SAMPLE W: TULA™ C


ASSESSMENT OF PARENT PLATE: SUMMARY

Velocity RatioAttenuationSpectral FrequencyAUBTPAUTTOFDTFMTULA

Indicative of HTHAIndicative of HTHAIndicative of HTHAIndicative of HTHAIsolated indicationsLocalised inclusionsIsolated indicationsLocalised inclusions

Metallography: Not HTHA


ASSESSMENT OF PARENT PLATE: METALLOGRAPHY

Original steelmaking inclusions


HYDROGEN INDUCED COLD CRACKING: HICC


HICC: TULA™ C IMAGE


TUBE PLATE SAMPLE: TULA™ A


TUBE PLATE SAMPLE: TULA™ A IMAGES


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


TUBE PLATE SAMPLE: MICRO VALIDATING NDE


HEAT EXCHANGER SKID BAR ATTACHMENT WELD TO SHELL HAZ

Crack top tips visible full length of can 3


HEAT EXCHANGER SKID BAR: TULA™ B


HEAT EXCHANGER SKID BAR HTHA CRACKING

Colony of micro cracksTip of 3mm HTHA crack


HEAT EXCHANGER SKID BAR ATTACHMENT WELD TO SHELL HAZ

NDT validated by metallography


NOZZLE SECTION: TULA™ A & C

Sample removed for sectioning


OD NOZZLE SECTION: TULA™ A

HTHA detected using 10MHz TULA probe, infinity focus, imaging very fine damage


ID NOZZLE SECTION: TULA™ C

HTHA detected best from ID using focussed TULA probe


VALIDATION OF TULA™ INDICATIONS

Small manganese sulphide inclusions surrounded by incipient HTHA damage (methane voids)


SEM RESULTS


• 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


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.


• 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


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


[email protected]

QUESTIONS?

Innovation, Application, Validation & SolutionThe Complete NDT Inspection Support Organisation

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