OmniScan MX2 and the Codes - NDT2012 NDT DAYS 2012... · The Omniscan and the Codes for Weld Inspection ... Wedge calibration ... Conventional UT technique still can be used

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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Example 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

The OMNISCAN and the CODES

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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)

The OMNISCAN and the CODES

Example with ASME Code Case 2235

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� One Person Operation

� Portable Phased Array instrument� PA + TOFD

� Hand Scanner

� Couplant andPump

� Linear Scanning

The OMNISCAN and the CODES

Example with ASME Code Case 2235

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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

The OMNISCAN and the CODES

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”

The OMNISCAN and the CODES

Scan Plans (1)

Example with ASME Code Case 2235

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

The OMNISCAN and the CODES

Example with ASME Code Case 2235

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Transmitter ReceiverLateral wave

LW

Upper tip Lower tip

Back-wall reflection

BW

The OMNISCAN and the CODES

Example with ASME Code Case 2235

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Typical TOFD Display� Gray scale and RF for

phase information

� OD and ID visible

� Defects detectable in middle

The OMNISCAN and the CODES

Example with ASME Code Case 2235

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

The OMNISCAN and the CODES

Our approach

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The OMNISCAN and the CODES

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)

The OMNISCAN and the CODES

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PA Codes - American

The 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 CODES

PA Codes - Europe

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Required features

-

Available with the OMNISCAN

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The OMNISCAN and the CODES

� 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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The OMNISCAN and the CODES

Required 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

The OMNISCAN and the CODES

Required features – Available with the OMNISCAN

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

distance from centerline

The OMNISCAN and the CODES

Required features – Available with the OMNISCAN

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� TOFD

The OMNISCAN and the CODES

Required features – Available with the OMNISCAN

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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

The OMNISCAN and the CODES

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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 CODES

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

The OMNISCAN and the 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

The OMNISCAN and the CODES

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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 CODES

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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The OMNISCAN and the CODES

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

The OMNISCAN and the CODES

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