OmniScan MX2 and the Codes - NDT2012

The Omniscan and the Codesfor Weld Inspection

Thierry COUTURIER, OISE Petr Dobsak, Olympus CEE

2Example with ASME Code Case 2235

Phased-Array

TOFD

The OMNISCAN and the CODES

3Example with ASME Code Case 2235

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


4 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)

The OMNISCAN and the CODESExample with ASME Code Case 2235

5 One Person Operation Portable Phased Array instrument

PA + TOFD Hand Scanner Couplant and

Pump Linear Scanning


6 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

The OMNISCAN and the CODESExample with ASME Code Case 2235 Equipment requirement

7 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)

Example with ASME Code Case 2235

ANGLES

8Scan 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


9Transmitter 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

The OMNISCAN and the CODESOur 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 (2009)

ISO 15626 - NDT of welds. TOFD technique. Acceptance levels (2011)


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PA Codes - AmericanThe OMNISCAN and the CODES

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

The OMNISCAN and the CODESPA 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 usefulWeld Overlay now available

Required features Available with the OMNISCAN

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The OMNISCAN and the CODESRequired features Available with the OMNISCAN

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

The OMNISCAN and the CODESTOFD 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

The OMNISCAN and the CODESTOFD 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 inspectionDNV-OS-F101API 1104DNV-OS-C401

Tandem technique is required

The OMNISCAN and the CODESLimitation of the Omniscan versus the Codes

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Girth Weld Inspections: Onshore / OffshorePipe Wizard

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Phased-array Pulse/Echo

Phased

-arr

ay 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

F1F2F3F4F5

Zones

Calibration

F5F4F3F2F1

Cap

HPLCPRoot

Zone discrimination technique with Tandem techniquePipe Wizard

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Pipe Wizard

Focus LT +Motor Control Unit

Automated Scanner

No more the Omniscan

OmniScan MX2 and the Codes - NDT2012

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