ASME B31.3 ACCEPTANCE CRITERIA

  • ASME B31.3 ACCEPTANCE CRITERIA

     chris updated 3 weeks, 6 days ago 2 Members · 3 Posts
  • nde

    Member
    21/05/2021 at 6:41 am

    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

  • chris

    Member
    21/05/2021 at 6:42 am

    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.

  • chris

    Member
    21/05/2021 at 6:42 am

    The Acceptance criteria you quoted is for slag incusions. LOP, LOF ad cracks are all rejectable.

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