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ASME B31.3 ACCEPTANCE CRITERIA
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ASME B31.3 ACCEPTANCE CRITERIA
Dear All,
Please refer below for ASME B31.3 acceptance criteria. To reject any indication i need to comply 3 rules :-
1. It must be linear indication
2. The indication level must be above reference level
3. Comply with Rejectable length.If i never comply with one of the above criteria i cant reject any indcation. How about Lack of sidewall fusion , lack of penetration and crack which is consider as a serious indication? Do i still need to follow this 3 rules or can i reject this indication since its a serious indication? I am just concern about small thickness and please advice. I just found one lack of sidewall fusion which is :-
Length :4mm
Amplitude level : 50% DAC
Material thickness : 5.49 ( 3″ sch 40)ASME B31.3-ACCEPTANCE CRITERIA
344.6.2 Acceptance Criteria. A linear-type discontinuity
is unacceptable if the amplitude of the indication
exceeds the reference level and its length exceeds
(a) 6 mm (1⁄4 in.) for Tw ≤ 19 mm (3⁄4 in.)
(b) Tw/3 for 19 mm < Tw ≤ 57 mm (21⁄4 in.)
(c) 19 mm for Tw > 57 mm -
2 Replies
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1. It must be linear indication
2. The indication level must be above reference level
3. Comply with Rejectable length.First of all, where does it state in ASME B31.3 that an indication has to be linear to be rejected?
If you have Lack of Fusion or a crack or Lack of Penetration, it is rejected anyway, regardless of length. If you don’t reject it, you’re not doing your job.
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ASME B31.3 Acceptance Criteria
344.6.2 Acceptance Criteria. Acceptance criteria
shall be as described in (a) or (b).
(a) A linear-type discontinuity is unacceptable if the amplitude of the indication exceeds the
reference level and its length exceeds
(1) 6 mm (1⁄4 in.) for Tw 19 mm (3⁄4 in.) (2) Tw/3 for 19 mm Tw 57 mm (21⁄4 in.) (3) 19
mm (3⁄4 in.) for Tw 57 mm (21⁄4 in.)
(b) The fracture mechanics ultrasonic acceptance cri- teria in Appendix R may be used if all
requirements of
Appendix R are met.
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