Be wary of putting too much faith in NDT results unless you have the appropriate tools and assurance activities in place. This presentation covers the basics of Non-destructive testing (NDT). Overview of the services we offer for NDT using our RBI software, radiography, ultrasonics. NDT is essential tool in maintaining the integrity of assets.
What is the reliability of in service non-destructive testing (NDT)?
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Reliability of In-Service NDT
Speaker information
November 11-14, 2014 Adipec
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Introduction
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NDT is a critical tool in our Integrity Management Toolbox
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The majority of In-Service Inspection we do is NDE
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Piping, vessels, exchangers, tanks, pipelines & structures
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We place a lot of FAITH in the NDT results and use it to determine FFS
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Is our FAITH justified?
November 11-14, 2014 Adipec
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Reliability of In-Service NDT
November 11-14, 2014 Adipec
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Types of NDT applied for In-Service Inspection
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Ultrasonic
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Radiography
Advanced techniques –
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ToFD, Phased Array,……
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Digital / Computerised RT
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Slofec / MFL
November 11-14, 2014 Adipec
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Analysis
Build comprehensive Asset Register
HIGH
MED HIGH
Perform detailed Risk Based Inspection (RBI) studies
MEDIUM
Determine applicable damage mechanisms
LOW
Great lengths – but can we detect, can we measure, does technician know what
he is looking for????
November 11-14, 2014 Adipec
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Construction NDT v In-Service NDT
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Training and Certification to support Oil
& Gas Construction activity
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Increasing % of NDT in O&G is InService NDT / Non-Intrusive Inspection
(NII)
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However most NDT training still reflects
looking for weld flaws rather than inservice damage mechanism
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Often Opco’s not rigorous enough in
specifying requirements
November 11-14, 2014 Adipec
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In-Service NDE – so what’s different?
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Different skills & mindset required
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Techniques / responses / interpretation differ greatly
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Corrosion and Erosion – random
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Defect locations and orientation and morphology not readily predictable………
November 11-14, 2014 Adipec
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Weld Root Corrosion & Erosion/Corrosion *
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Influencing Factors for Consideration
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PANI (Programme for Assessment of NDT in Industry) requirements
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Take account of Human factors & enviromental conditions
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Training on specific samples
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Knowledge of damage mechanisms
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Appropriate Written Procedures and Reporting requirements
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Suitable POD to give desired Confidence Level
November 11-14, 2014 Adipec
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Typical Issues Observed
Competence – not received correct training for actual task
Experience / knowledge – no appreciation of what inside of pipe may actually
look like!
Procedures – do not reflect in-service application (no DAC curve!)
Reporting – not clear & concise, poor layout and lack detail to support FFS
Appropriate technique – will not find and measure actual expected damage
November 11-14, 2014 Adipec
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New Inspection Technology
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Not always available in MEA region
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Sometimes equipment is available, but the Operator??
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In-Service training & experience with technique is still essential
November 11-14, 2014 Adipec
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What of Other Techniques?
Radiography
Trained to interpret and
identify weld flaws
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Measurement of
remaining ligament
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Scale, sand, heat,
vibration, debris…..
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Inspection Technique Selection
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Consideration is required to ensure selection of most appropriate technique(s)
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Random deep, isolated, localised pitting on 6”dia piping – long lengths of
straight pipe
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Manual ultrasonic scanning with 0 degree compression probe – is this the best
approach?
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Looking for needle in a haystack! Applied Magnetic Flux Leakage (MFL) as a
rapid screening, with detailed UT assessment of limited areas of interest
November 11-14, 2014 Adipec
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Typical Areas for Improvement
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In-Service orientated NDE Procedures
•Consider
inspection conditions (access, weather, boredom, etc.)
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Make use of “hard copy” techniques
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Mix and match techniques (Slofec/TOFD/PE)
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Assurance/ x-checks on high criticality
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Ensure relevant training and awareness
November 11-14, 2014 Adipec
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Summary
- In-Service NDT is an essential tool in maintaining the Integrity of our Assets
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In-Service NDT requires specific skills, training, experience & procedures
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Be wary of putting too much FAITH in NDT results unless you also have the
appropriate controls and assurance activities in place
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LR can help you have greater confidence in this critical data
November 11-14, 2014 Adipec
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