34 coulas rev1 - ndt · gwt, rft and paut work effectively to complement each other for speed and...
TRANSCRIPT
Powering our future with operational and project excellence
OPG Nuclear
Jason Coulas, Sr. Technical EngineerOntario Power GenerationInspection & Maintenance Services
Synergies between GWT, RFT and PAUT Inspection Techniques for Piping Defects in a CANDU Nuclear Environment -June 2015
NDT in Canada 2015 Conference
ND
T in C
anada 2015 Conference, June 15-17, 2015, E
dmonton, A
B (C
anada) - ww
w.ndt.net/app.N
DT
Canada2015
• Safe ty • Hum an Pe rformance • Re l iabil ity • V alue for Mone yO P G I N T E R N A L U S E O N L Y
Outline
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1. OPG’s Piping & Inspection Requirements
2. General Piping Degradation Mechanisms
3. Inspection Solutions
4. Example 1: Buried Piping CUI/SCC
5. Example 2: Piping Screening: GWT/PAUT
6. Example 3: PAUT and PAUT Screening
7. Example 4: Reverse Engineering
8. Conclusions & Acknowledgments
NDT in Canada 2015 Conference
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OPG’s Piping & IMS Inspections
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Proactive
Inspection
Development
PRESENT
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General Piping Degradation Forms
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Solution Comparisons
Analytical Disposition
Internal Visual & Surface Methods – Visual Rovver, PT, MPI
Pressure Test + Analytical Disposition
Acoustic/Bd-band Electromagnetic, Guided Wave UT (Screening), PAUT Wheel-probe (Screening)
High Resolution ILI UT
High Resolution Robotics EMAT/MFL/UT
Remote Field Electromagnetic – RFT, Local PAUT
COST/Complexity
Reso
luti
on
\Cap
ab
ilit
yNo “Silver Bullet”
NDT in Canada 2015 Conference
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Example 1: Steam line – Problem Statement
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North
PitSouth
Pit
45°
elbow
~100 ft.
304
Stainless
Steel
Section
Carbon
Steel
Section
•Leaks (CUI, Pitting & SCC) from clean water steam lines destined for
discharge to lake
•Carbon Steel and 304 Stainless
Steel at different locations in system
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Buried Steam line – Problem Statement
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IMS Rovver
NPS 6 Buried Steam line (Corrosion Under Insulation-CUI, Pitting, Stress Corrosion Cracking -SCC)
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Remote Field Testing: buried pipe technologies
� Pitting/general wall loss/OD/ID
� accurate ~ +/- 15%t� Occluded or dirty pipe ID-Ok
� No flooding, no launcher or receivers, lift-off ok, simple hand deployed or winch
� Leverage internal IMS & vendor cross-functional
knowledge & tools� Technology & IMS knowledge
transferable to other
applications.
RFT Tooling
IMS
Rover
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Quantifying RFT Indications/Defects
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RFT in practice
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VT, Rovver, PAUT, Pit Gauges, replica - all selected as in-house tools for confirmation of RFT indications
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Example 2: Pipe “Screening”- GWT/PAUT
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GWT “Ring”
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GWT Pipe Screening Cont’d…
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General Concept of Guided Wave Testing:
• Propagates along component using pipe
wall to “guide” ultrasound travel
• Changes in x-section or impedance
provides a reflection indication on data
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GWT Pipe Screening Cont’d…
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Wall “t”SCC “0.70t”
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GWT Pipe Screening Cont’d…
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PAUT ConfirmDepths
Original In-field GWT
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Example 3: PAUT & PAUT Screening
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Piping Welds: PAUT Scanners (IQ)
IQ POD Study
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PAUT & PAUT Screening Cont’d…
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Corrosion PAUT “Wheel-probe” Screening� Fast PAUT “screening”~4in/sec
� FAC/pitting-sensitive� Simple water mist for couplant
� Conformable wheel � Follow-up local areas of interest with
existing MIC PAUT Sizing Procedure
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Example 4: Reverse Engineering: Defects of Interest
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Field Sample
Laser Scan/3D CAD
High Resolution CNC Machining
RFT Inspection Technique
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Conclusions
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� Aging plant piping requires more advanced “screening”
� Suite of tools most effective – no “Silver Bullet”
� GWT, RFT and PAUT work effectively to complement each other for speed and focusing effort on most severe
defects
� OPG sees an increased need to grow these technologies for its aging plants as well as the new refurbished sites
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Acknowledgments
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� We would like to thank OPG to support this presentation
and the OPG IMS “Piping and Rotating Equipment” technicians and Support Engineers for their efforts on
these new technologies.
� All the support from our vendor’s technical staff
especially at CADWIRE, Guided Ultrasonics Ltd., Russell NDE & PICA Corp., Zetec, Olympus, Creaform,
Sonatest and Jireh Industries. All have provided invaluable support on techniques, products and development.
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QUESTIONS?
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