ASME Code Case 181

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Charlie ChongT-434.1.3 Quality. Prior to fabrication, the block material shall be completelyexamined with a straight beam search unit. Areas that contain an indicationexceeding the remaining back-wall reflection shall be excluded from the beampaths required to reach the various calibration reflectors.
Flaw size shall be no larger than the flaw in Table 1 or 2 for the thickness tobe examined.Acceptable performance is defined as response from the maximum allowableflaw and other flaws of interest demonstrated to exceed the reference level.Alternatively, for techniques that do not use amplitude recording levels,acceptable performance is defined as demonstrating that all imaged flawswith recorded lengths, including the maximum allowable flaws, have anindicated length equal to or greater than the actual length of the flaws in thequalification block.TABLE 1FLAW ACCEPTANCE CRITERIA FOR WELDTHICKNESS LESS THAN 25 mm (1 in.)Charlie Chong
Page 1 and 2: ASME Code Case on Use of Alternativ
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Page 5 and 6: Charlie ChongB31 CASE 181-1CASES OF
Page 7 and 8: ASME B31.3344.6 Ultrasonic Examinat
Page 9 and 10: 344.6.2 Acceptance Criteria. A line
Page 11 and 12: (c) The ultrasonic examination shal
Page 13 and 14: Charlie ChongThe qualification bloc
Page 15: T-434.1.2 Material.(a) Similar Meta
Page 19 and 20: Charlie ChongGENERAL NOTES:(a)t = t
Page 21 and 22: Charlie ChongTABLE 2FLAW ACCEPTANCE
Page 23 and 24: Charlie Chong(d) The ultrasonic exa
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Page 31 and 32: Charlie Chong(c) Alternatively, oth
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Page 39 and 40: Charlie Chong(d) With the owner’s
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Page 45 and 46: 344.6.2 Acceptance Criteria. A line
Page 47 and 48: Charlie Chong4) Examinationa)The in
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Charlie ChongStored valves shall be
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(b) Category M Fluid Service: a flu
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1.0 Valve BodyThe valve body, somet
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5 Valve Certification and Retesting
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Charlie Chong/ Fion Zhang
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Charlie Chong/ Fion Zhang
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ASME Code Case 181

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