Extract from B31.2 - 2018 Appendix R :
R300 GENERAL
(a) This Appendix provides alternative fracturemechanics-
based acceptance criteria for ultrasonic examination
that may be used for Code piping in lieu of those
described in para. 344.6.
(b) The acceptance criteria within this Appendix are
applicable to Tw having a thickness equal to or greater
than 25 mm (1.0 in.). The acceptance criteria stated in
para. 344.6.2 shall be used for all thicknesses less than
25 mm (1.0 in.).
(a) This Appendix provides alternative fracturemechanics-
based acceptance criteria for ultrasonic examination
that may be used for Code piping in lieu of those
described in para. 344.6.
(b) The acceptance criteria within this Appendix are
applicable to Tw having a thickness equal to or greater
than 25 mm (1.0 in.). The acceptance criteria stated in
para. 344.6.2 shall be used for all thicknesses less than
25 mm (1.0 in.).
and
R301 SCOPE
(a) The examination shall be conducted using autom
a t e d o r s e m i a u t o m a t e d t e c h n i q u e s u t i l i z i n g
computer-based data acquisition.
(b) The examination shall be performed in accordance
with a written procedure approved by UT (ultrasonic
testing) Level III personnel [see para. R303(a)] and
conforming to the requirements of ASME BPVC, Section
V, Article 4, Mandatory Appendix VIII, and
(1) for phased array — ASME BPVC, Section V, Article
4, Mandatory Appendix V
(2) for time of flight diffraction (TOFD) — ASME
BPVC, Section V, Article 4, Mandatory Appendix III
(c) Procedure qualification shall meet the requirements
of ASME BPVC, Section V, Article 4, Mandatory
Appendix IX.
(a) The examination shall be conducted using autom
a t e d o r s e m i a u t o m a t e d t e c h n i q u e s u t i l i z i n g
computer-based data acquisition.
(b) The examination shall be performed in accordance
with a written procedure approved by UT (ultrasonic
testing) Level III personnel [see para. R303(a)] and
conforming to the requirements of ASME BPVC, Section
V, Article 4, Mandatory Appendix VIII, and
(1) for phased array — ASME BPVC, Section V, Article
4, Mandatory Appendix V
(2) for time of flight diffraction (TOFD) — ASME
BPVC, Section V, Article 4, Mandatory Appendix III
(c) Procedure qualification shall meet the requirements
of ASME BPVC, Section V, Article 4, Mandatory
Appendix IX.
Στις Τρί, 22 Σεπ 2020 στις 6:12 π.μ., ο/η Vinay Thattey <vinay.thattey@gmail.com> έγραψε:
You are right ,B31 Case 181‐2 "Use of Alternative Ultrasonic Examination Acceptance Criteria in ASME B31.3 "TABLE 1 includes acceptance criteria for surface flaws above 25mm . As per my knowledge , there is no change--On Fri, 18 Sep 2020 at 18:05, Manish Kumar <mkmkr431@gmail.com> wrote:Dear Sir,--As per code B31.3 case 181, Minimum thickness for PAUT has been written 25mm.Kindly,give the advise for minimum thickness for PAUT as per latest revision of said code.
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Dr. Georgios Dilintas,
Dipl. Ing. In Aeronautic and Space Engineering
Ph.D in Mechanics of Solids - Computational Mechanics
A.I.S, A.N.I, IRCA Lead Auditor
Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis
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