NDT ACCEPTANCE CRITERIA.xls

ACCEPTANCE CRITERIA

NON DESTRUCTIVE TEST LIQUID PENETRANT TESTING: PRINCIPLE: PROCEDURE PREPARED : EVALUATION: ACCEPTANCE CRITERIA: 1

CAPILLARY ACTION ASME SECTION V (ARTICLE VI) ASME SECTION VIII (APPENDIX 8) AN INDICATION OF AN IMPERFECTION MAY BE LARGER THAN THE IMPERFECTION THAT CAUSES IT HOWEVER THE SIZE OF THE INDICATION IS THE BASIS FOR ACCEPTANCE EVALUATION. ONLY INDICATIONS WITH MAJOR DIMENSIONS GREATER THAN 1.5 MM SHALL BE CONSIDERED RELEVANT. A LINEAR INDICATION IS ONE HAVING A LENGTH GREATER THAN THREE TIMES THE WIDTH. A ROUNDED INDICATION IS ONE OF CIRCULAR OR ELLIPTICAL SHAPE WITH THE LENGTH EQUAL TO OR LESS THAN THREE TIMES THE WIDTH.

MAGNETIC PARTICLE TESTING: PRINCIPLE: LEAKAGE OF MAGNETIC FLUX. PROCEDURE PREPARED : ASME SECTION V (ARTICLE VII) EVALUATION: ASME SECTION VIII (APPENDIX 6) ACCEPTANCE CRITERIA: AN INDICATION OF AN IMPERFECTION MAY BE LARGER THAN THE IMPERFECTION THAT CAUSES IT HOWEVER THE SIZE OF THE INDICATION IS THE BASIS FOR 1 ACCEPTANCE EVALUATION. ONLY INDICATIONS WITH MAJOR DIMENSIONS GREATER THAN 1.5 MM SHALL BE CONSIDERED RELEVANT. A LINEAR INDICATION IS ONE HAVING A LENGTH GREATER THAN THREE TIMES THE A ROUNDED INDICATION IS ONE OF CIRCULAR OR ELLIPTICAL SHAPE WITH THE LENGTH EQUAL TO OR LESS THAN THREE TIMES THE WIDTH. ANY QUESTIONABLE OR DOUBTFUL INDICATIONS SHALL BE REEXAMINES TO DETERMINE WHETHER OR NOT THEY ARE RELEVANT.

ANY QUESTIONABLE OR DOUBTFUL INDICATIONS SHALL BE REEXAMINES TO DETERMINE WHETHER OR NOT THEY ARE RELEVANT. 2

2

A RELEVANT LINEAR INDICATIONS

A RELEVANT LINEAR INDICATIONS

A RELEVANT ROUNDED INDICATIONS GREATER THAN 5MM

A RELEVANT ROUNDED INDICATIONS GREATER THAN 5MM

FOUR OR MORE RELEVANT ROUNDED INDICATIONS IN A LINE SEPARATED BY 1.5MM OR LESS (EDGE TO EDGE).

FOUR OR MORE RELEVANT ROUNDED INDICATIONS IN A LINE SEPARATED BY 1.5MM OR LESS (EDGE TO EDGE). VISUAL INSPECTION AS PER ASME B 31.3

ULTRASONIC TESTING (UT):

EXTENT OF IMPERFECTION (CRACK, LACK OF FUSION, INCOMPLETE PENETRATION)

ZERO (NO EVIDENT IMPERFECTION)

PRINCIPLE:

ACOUSTIC IMPEDENCE MISMATCH

DEPTH OF INCOMPLETE PENETRATION

< 1 mm & 0.2 Tw

PROCEDURE PREPARED :

ASME SECTION V (ARTICLE IV)

CUMMULATIVE LENGTH OF INCOMPLETE PENETRATION

< 38 mm in any 150 mm weld length

EVALUATION:

ASME SECTION VIII (APPENDIX 12)

DEPTH OF LACK OF FUSION AND INCOMPLETE PENETRATION.

< 0.2 Tw

ACCEPTANCE CRITERIA:

DEPTH OF UNDERCUT

< 1 mm & Tw/2

1

IMPERFECTIONS WHICH PRODUCE A RESPONSE GREATER THAN 20% OF THE REFERRENCE LEVEL SHALL BE INVESTIGATED TO THE EXTENT THAT THE OPERATOR CAN DETERMINE THE SHAPE,IDENTITY, AND LOCATION OF ALL SUCH IMPERFECTIONS AND EVALUATE THEM IN TERMS OF THE ACCEPTANCE STANDARDS GIVEN BELOW.

SURFACE ROUGHNESS

< 500 min Ra per asme B46.1

A

INDICATIONS CHARACTERIZED AS CRACKS, LACK OF FUSION, OR INCOMPLETE PENETRATION ARE UNACCEPTABLE REGARDLESS OF LENGTH.

DEPTH OF ROOT SURFACE CONCAVITY

TOTAL JOINT THICKNESS, INCL.WELD REINF., >Tw

OTHER IMPERFECTIONS ARE UNACCEPTABLE IF THE INDICATION EXCEED THE RREFERENCE LEVEL AMPLITUDE AND HAVE LENGTHS WHICH EXCEED: 6 MM FOR t UP TO 19 MM. t/3

FOR

t

FROM

19MM TO 57 MM.

19MM FOR t OVER 57 MM. WHERE "t" IS THE THICKNESS OF THE WELD EXCLUDING ANY ALLOWABLE REINFORCEMENT. FOR A BUTT WELD JOINING TWO MEMBERS HAVING DIFFFERENT THICKNESSES AT THE WELD, "t" IS THE THINNERR OF THESE TWO THICKNESSES. IF A FULL PENETRATION WELD INCLUDES A FILLET WELD, THE THICKNESS OF THE THROAT OF THE FILLET SHALL BE INCLUDED IN "t".

< 6 mm

HEIGHT mm <1.5 mm

> 6 mm & < 13 mm

< 3mm

> 13 mm & < 25mm

< 4mm

> 25 mm

< 5 mm

HEIGHT OF REINFORCEMENT OR INTERNAL PROTRUSION.

Tw min

ACCEPTANCE CRITERIA

NON DESTRUCTIVE TEST VISUAL INSPECTION: PRINCIPLE: PROCEDURE PREPARED : EVALUATION: ACCEPTANCE CRITERIA: EXTENT OF IMPERFECTION (CRACK, LACK OF FUSION, INCOMPLETE PENETRATION) DEPTH OF INCOMPLETE PENETRATION

CUMMULATIVE LENGTH OF INCOMPLETE DEPTH OF LACK OF FUSION AND INCOMPLETE PENETRATION. DEPTH OF UNDERCUT SURFACE ROUGHNESS DEPTH OF ROOT SURFACE CONCAVITY HEIGHT OF REINFORCEMENT OR INTERNAL PROTRUSION.

ASME SECTION V (ARTICLE VI) ASME B 31.3 TABLE 341.3.2 ZERO (NO EVIDENT IMPERFECTION) < 1 mm & 0.2 Tw < 38 mm in any 150 mm weld length < 0.2 Tw < 1 mm & Tw/2 < 500 min Ra per asme B46.1 TOTAL JOINT THICKNESS, INCL.WELD REINF., >Tw Tw min HEIGHT mm < 6 mm <1.5 mm > 6 mm & < 13 mm < 3mm > 13 mm & < 25mm < 4mm > 25 mm < 5 mm