Influence of PAUT parameters on crack sizing

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JUNE 2010

CIORAU-PAUT PARAMETERS 1

3RD INT CANDU IN-SERVICE-INSPECTION & NDT IN CANADA 2010 CONFERENCE

The Influence of PAUT Parameters onCrack Location, Pattern and Height Sizing

Peter Ciorau – Ontario Power Generation

Inspection, Maintenance & Commercial

Services Division - Pickering – Canada

E-MAIL : [email protected]



JUNE 2010



OUTLINES:

1. PROBLEM STATEMENT

2. EXPERIMENTAL PROGRAM

3. WEDGE AND PROBE PARAMETERS

4. MACHINE + FOCAL LAW PARAMETERS

5. CONCLUSIONS

6. ACKNOWLEDGEMENTS



JUNE 2010




• DEFECT PARAMETERS (LOCATION, LENGTH, HEIGHT,

PATTERN (NATURE) MAY BE INFLUENCED BY:

- PROBE (DEAD ELEMENTS, PITCH SIZE, ACTIVEAPERTURE)

- WEDGE (ANGLE, VELOCITY, H1)

- TESTPIECE VELOCITY

- MACHINE (FILTERS, FREQUENCY)

- FOCAL LAW CALCULATOR (FOCAL DEPTH,

ACTIVE APERTURE, ANGULAR RESOLUTION)

• TOLERANCES MUST BE SET BASED ON APPLICATION

(WHAT IS CRITICAL FOR FINAL REPORTING)


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• PAUT IS NOT DIFFERENT FROM CONVENTIONAL UT

• ERRORS MUST BE QUANTIFIED• THERE ARE LIMITS AND “TRICKS” IN PAUT

• ONE MUST EXPECT THE ACCURACY IN SIZING, LOCATION

AND DISPLAY (PATTERN) MAY BE AFFECTED BY SYSTEMATIC,RANDOM AND HUMAN ERRORS

• CAN PAUT COMPETE WITH TOFD (+/- 0.3 MM) ?

• CAN PAUT PERFORMANCE BE IMPROVED BY ACCESS ANDSPECIAL SET-UPS?

• CAN WE AFFORD CUMULATIVE INDEPENDENT ERRORS?






TEST # BLOCK ID PROBE ID FEATURES

1OHR 20

# 18

TW : P66-45T

(PLEXIGLASS)CRACK HEIGHT (D), LOCATION

2 AB 259TW : P9-30REX

(REXOLITE)

CRACK HEIGHT (D) LOCATION,

PATTERN

3 AB 163B LW : 78, 80, 84CRACK HEIGHT (S)

LOCATION, ANGLE

4L-1 ST.

AS BUILTLW : P21, P25

CRACK LENGTH (D)

LOCATION, ANGLE

5OHR 20

ACUREN-SCCTW : P74-45T CRACK HEIGHT, PATTERN








WHY SUCH TOLERANCES ?

- TURBINE INSPECTION (LITTLE MARGIN OF ERRORS; COMPARISON WITH MP

AND FM )

- SCC PATTERN – A MUST (HIGH RESOLUTION)

4.2 mm

15.8 mm



JUNE 2010




WHY SUCH TOLERANCES ?

- TURBINE INSPECTION (LITTLE MARGIN OF ERRORS)

- SCC PATTERN – A MUST (HIGH RESOLUTION)

HIGHRELIABILITY

PAUT

RESULTS VS

MP AND FM

STEEPLE / BLADE

GEOMETRY



JUNE 2010




TEST #1

LOCATION

PLEXIGLASSHEIGHT

WEDGE VELOCITY



JUNE 2010




REXOLITE WEDGE VELOCITYTEST #2

2450 m/s2250 m/s



JUNE 2010



3. WEDGE AND PROBE PARAMETERSWEDGE ANGLETEST #2

28 DEG30 DEG

ACTUAL33 DEG



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3. WEDGE AND PROBE PARAMETERSHEIGHT OF THE 1ST ELEMENT

1.5 mm 3.5 mm



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3. WEDGE AND PROBE PARAMETERSCAN WE ACCEPT THESE TOLERANCE – COMBINED?

TEST #2

H1 = 3.5 MM; 2300 M/S; 32 DEGREES H1 = 1.5 MM; 2400 M/S; 28 DEGREES

NOT ACCEPTED !



JUNE 2010



3. WEDGE AND PROBE PARAMETERSPROBE PITCHTEST #1

Tolerance: +/- 50 microns

RD



JUNE 2010



3. WEDGE AND PROBE PARAMETERSPROBE PITCHTEST #2, 3

3RD INT CANDU IN SERVICE INSPECTION & NDT IN CANADA 2010 CONFERENCE



JUNE 2010




PROBE PITCHTEST #3




JUNE 2010




PROBE PITCHTEST #4




JUNE 2010




PROBE PITCHTEST #4

P 25 – 0.8 MM

P 25 – 0.6 MM

P 25 – 0.4 MM

ACTUAL

TOLERANCE: + / - 150 MICRONS




JUNE 2010




VIDEO DISPLAY

SMOOTHING ON SMOOTHING OFF




JUNE 2010


3 INT CANDU IN-SERVICE-INSPECTION & NDT IN CANADA 2010 CONFERENCE


ANGULAR

RESOLUTION

10 A-SCANS

COURTESY OLYMPUSNDT-USA

ELECTRONIC

/LINEAR SCANNING

0.5 DEG 1 DEG 4 DEG




JUNE 2010


3 INT CANDU IN SERVICE INSPECTION & NDT IN CANADA 2010 CONFERENCE


FILTERS AND FOCAL DEPTH

TEST #5

F = 7 MM; 10 MHZ

F = 4 MM; HR 10 MHZ

F = 2 MM; HR 10 MHZ

F = 1 MM; HR 10 MHZ

SCC DEPTH,

PATTERN




JUNE 2010


3 INT CANDU IN SERVICE INSPECTION & NDT IN CANADA 2010 CONFERENCE

4A. TESTPIECE VELOCITY PARAMETERS

3050 M/S3200 M/S 3350 M/S

TOLERANCE:

+/- 100 M/S




JUNE 2010


5. CONCLUSIONS

• TOLERANCES MUST BE SET FOR SPECIFIC APPLICATIONS

• INDIVIDUAL TOLERANCES ARE LARGER THAN THE COMBINED

ONES

• 1ST HEIGHT : NO EFFECT ON CRACK HEIGHT AND PATTERN;

EFFECT ON LOCATION; +/- 1 MM ACCEPTABLE

• WEDGE VELOCITY: + / - 60-80 M/S ACCEPTABLE

• WEDGE ANGLE: + / - 1 DEGREE ACCEPATABLE

• PROBE PITCH: + / - 60 MICRONS ACCEPTABLE

• TESTPIECE VELOCITY: + / - 80 M/S ACCEPTABLE

• OTHER PARAMETERS, SUCH AS FILTERS, FOCAL DEPTH ANDANGULAR RESOLUTION MUST BE SET BASED ON APPLICATION;

BETTER TO COVER 0.2-1.2 T; < 0.5 DEGREES; RECOMMENDED HR

FILTERS




JUNE 2010


6.0 ACKNOWLEDGEMENTS

1. The author thanks to the Management of IM&CS

Division - OPG for granting the presentation and

publication of the present paper to the 3-rd CANDU

ISI & NDT in Canada-2010 Conference.

2. Special thanks to Chris Chartier - Acuren Oakville

for welded pipe sample with SCC.

3. Thanks to OlympusNDT – Waltham – USA forallowing to use 2 figures from PA book.

QUESTIONS ?THANK YOU !

Influence of PAUT parameters on crack sizing

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