OmniScan MX2 and the Codes - NDT2012 NDT DAYS 2012... · The Omniscan and the Codes for Weld...

The Omniscan and the Codesfor Weld Inspection

Thierry COUTURIER, OISE

Petr Dobsak, Olympus CEE

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Example with ASME Code Case 2235

� Phased-Array

� TOFD

The OMNISCAN and the CODES

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� Based on Performance Demonstration

� Requires detecting three defects (ID, OD, sub-surface)

� Requires full data collection and encoder (AUT)

� Can be TOFD, pulse-echo or combination, or Phased Array


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� ASME – CC2235� Has dominated for 12 years for AUT instead of RT

� Very widely used – globally

� Completed with 5 ASME Code Cases� CC 2541: Manual Phased Array with single beam

� CC 2557: Manual Phased Array with S-scans

� CC 2558: Manual Phased Array with E-scans (Linear Scans)

� CC 2599: Encoded (AUT) Phased Array with E-scans (Linear Scans)

� CC 2600: Encoded (AUT) Phased Array with S-scans (Linear Scans)



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� One Person Operation

� Portable Phased Array instrument� PA + TOFD

� Hand Scanner

� Couplant andPump

� Linear Scanning



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� Calibrate all beams - Very important

� Wedge calibration� Velocity Calibration� TCG Calibration

� Use same Focal Law for calibration as for scanning

� Develop Scan Plan to show coverage and appropriate angles

� Use two (or more) S-scans if required - Multi-Group

� Scan parallel to weld with Encoder /Full data collection at fixed distance from centerline


Example with ASME Code Case 2235 – Equipment requirement

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� Ray tracing using ESBeamTool or the Omniscan Weld Overlay with sample

Bevel Incidence Angles (arrowed) calculated on 25mm wall double-V weld

� Can check if angles are “not appropriate”


Scan Plans (1)


ANGLES

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Scan Plans (2)

HAZ poorly addressed

� Note poor coverage of heat affected zone (arrowed) ▬► move array for optimization

� Again Ray tracing using ESBeamTool or the Omniscan Weld Overlay is

required

COVERAGE



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Transmitter ReceiverLateral wave

LW

Upper tip Lower tip

Back-wall reflection

BW



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Typical TOFD Display� Gray scale and RF for

phase information

� OD and ID visible

� Defects detectable in middle



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� Some customers can develop their own procedures� AREVA� GDF� TOTAL� …


Our approach

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Some existing codes

(ASME, ASTM, EN, ISO, AWS, API, DNV, …)

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TOFD Codes

� ASME TOFD Code (Section V Article 4 Mandatory Appendix III) (2006)

� ASME TOFD Interpretation Manual (Non-mandatory App. N)

� ASTM E-2373 - Standard Practice for Use of TOFD Technique (2009)

� ASME Code Case 2235-9 - Boiler and Pressure Vessel (Oct. 2005)

� BS7706 “guideline”- Calibration and setting-up TOFD technique (1997)

� ENV 583-6 - TOFD technique as a method for defect detection and sizing

� EN14751 (supersedes EN583-6) – Used in Europe

� EN15617 - NDT of welds. TOFD technique. Acceptance levels (20 09)

� ISO 15626 - NDT of welds. TOFD technique. Acceptance levels (20 11)


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PA Codes - American


� ASME Code Case 2235-9 - Boiler and Pressure Vessel (Oct. 2005)

� ASTM E-2491-06 Recommended Practice for phased array set-up

� New E-2700 RP for Phased Array of welds.

� API 1104

� AWS D1.1

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� Some companies have developed their own procedures

� Still working on Phased Array code development

� Equivalent of “EN 12668” is coming

� For PA instrument� For PA probes� For PA systems (application)Not before 2012


PA Codes - Europe

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Required features

-

Available with the OMNISCAN

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� Scan Plan to show coverage and appropriate angles� ESBeamTool was mandatory, still very useful

�Weld Overlay now available

Required features – Available with the OMNISCAN

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� Calibration of all beams - 100% Calibration of the beam coverage

� Has always been a strength

� Wedge Delay / Velocity

� Sensitivity

� TCG – Manual/Automatic� ACG “angle corrected gain”� TCG “time corrected gain”

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� Use two (or more) groups if required with Multi-Group



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� Scan parallel to weld with Encoder and full data collection at fixed

distance from centerline



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� TOFD



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The Omniscan MX and Omniscan MX2

have all the required features so that an

inspection procedure can fulfil most of

the codes.

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� Phased-Array is now well accepted and understood

� Still explaining how Phased-Array works

� Conventional UT technique still can be used

� TOFD - Still some reluctant countries in Europe


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� More and more used all over the world

� Well-used and well-developed technique

� Complementary to Pulse/Echo (Conventional UT or PA)

� Successful to replace RT combined with Phase-Array


TOFD Codes

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TOFD Codes

� Customers feel very confident as no indication can be missed when combined with P/E

� Well “codified”, primarily from Europe

� No surprise – “invented” and “developed” here

� Not so many differences between the existing codes


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TOFD Advantages

� Excellent POD (Probability Of Detection) for mid-wall defects

� Good detection of mis-oriented defects

� Rapid and low cost inspections� Cheap solution� Small amount of data� Small amount of data to analyze


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Probability of detection(in %)

TOFD 83 %

Automated UT(Pulse / Echo)

84 %

Radiography 60 %

Manual UT 53 %

Probability of detection


TOFD Advantages

Results of comparison test (France)

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Industrial – Manual Weld

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Industrial – Automated Weld

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Aerospace – Composite Inspection

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Industrial – Corrosion

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Limitations of the Omniscanversus the codes

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�Pipe-Wizard applications and Girth Weld inspection�DNV-OS-F101

�API 1104

�DNV-OS-C401

�Tandem technique is required


Limitation of the Omniscan versus the Codes

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Girth Weld Inspections: Onshore / Offshore

Pipe Wizard

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Phased-array Pulse/Echo

Phased-array probe

Wedge

Weld

Pipe Wizard

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�Phased-array adjustments �Adjustment of emitter and receiver to hit the zone

� Adjustment of beam width to cover the height of the zone

� Adjustment of overlap in next zone

InspectionEmitter

Receiver

F1

F2

F3

F4

F5

Zones

Calibration

F5F4F3F2F1

Cap

HPLCPRoot

Zone discrimination technique with Tandem technique

Pipe Wizard

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Pipe Wizard

Focus LT +Motor Control Unit

Automated Scanner

No more the Omniscan

OmniScan MX2 and the Codes - NDT2012 NDT DAYS 2012... · The Omniscan and the Codes for Weld...

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Transcript of OmniScan MX2 and the Codes - NDT2012 NDT DAYS 2012... · The Omniscan and the Codes for Weld...