1、ASME B31.3 INTERPRETATIONSASME B31.3INTERPRETATIONS VOLUME 24Replies to Technical InquiriesApril 30, 2012 through December 16, 2013GENERAL INFORMATIONIt has been agreed to publish interpretations issued by the B31 Committee concerning B31.3as part of the update service to the Code. The interpretatio
2、ns have been assigned numbers inchronological order. Each interpretation applies to the Edition stated in the interpretation, or ifnone is stated, to the Edition in effect on the date of issuance of the interpretation. Subsequentrevisions to the Code may have superseded the reply.These replies are t
3、aken verbatim from the original letters, except for a few typographical andeditorial corrections made for the purpose of improved clarity. In some instances, a review ofthe interpretation revealed a need for corrections of a technical nature. In these cases, a revisedreply bearing the original inter
4、pretation number with the suffix R is presented. In the case wherean interpretation is corrected by errata, the original interpretation number with the suffix E is used.ASME procedures provide for reconsideration of these interpretations when or if additionalinformation is available which the inquir
5、er believes might affect the interpretation. Further,persons aggrieved by an interpretation may appeal to the cognizant ASME committee or subcom-mittee. As stated in the Statement of Policy in the Code documents, ASME does not “approve,”“certify,” “rate,” or “endorse” any item, construction, proprie
6、tary device, or activity.For detailed instructions on preparation of technical inquiries to the B31 Committee, refer toAppendix Z.NUMERICAL AND SUBJECT INDEXESNumerical and Subject Indexes have been prepared to assist the user in locating interpretationsby location or by subject matter in the Code.
7、They cover interpretations issued from Volume 1up to and including the present volume, and will be updated with each volume.I-1ASME B31.3 INTERPRETATIONSB31.3Subject Interpretation File No.Chapter IX, High Pressure Piping (B31.3-2012) 24-13 12-1782Fig. 323.2.2B, Design Minimum Temperature According
8、to ASME B31T(B31.3-2010) . 24-04 12-243Para. 302.3.6(a), Limits of Calculated Stresses Due to Occasional Loads(B31.3-2012) . 24-24 13-1331Para. 304.7.2, Pressure Design (B31.3-2010) 24-09 12-1504Para. 307.1.2, Qualification of Valve Pressure Design (B31.3-2010) . 24-18 13-509Para. 322.6.3, Relief De
9、vices (B31.3-2012) 24-16 13-266Para. 323.3.5, Acceptance Criteria (B31.3-2012). 24-26 13-1508Para. 328.5.4 and Fig. 328.5.4D, Welded Branch Connection (B31.3-2010) . 24-15 13-76Para. 328.5.4, Welded Branch Connections (B31.3-2010) . 24-10 12-1584Paras. 328.5.4(d) and (e), Use of a Branch Connection
10、Where theAbutting Branch Pipe Is Not Welded to the Run (B31.3-2012) . 24-23 13-789Para. 340.4(a), Owners Inspectors (B31.3-2010) 24-05 12-499Para. 341.3.1(a), NDE After PWHT for P-Nos. 3, 4, and 5 Materials(B31.3-2010) . 24-30 11-1769Para. 341.3.3, Defective Components and Workmanship (B31.3-1996Edi
11、tion Through B31.3-2012) 24-29 13-709Para. 341.4.1(b), Sample Examinations (B31.3-2010) 24-08 12-1071Para. 341.4.1(b)(1), Prequalification of Welds by Random Examination(B31.3-2012) . 24-22 13-786Paras. 344.2.1 and 342.1, Visual Examination (B31.3-2012). 24-21 13-710Para. 345, Pneumatic Leak Testing
12、 (B31.3-2010) 24-11 12-1610Para. 345.2.2(a), Examination During Leak Testing (B31.3-1996 Edition ThroughB31.3-2010) 24-07 12-56, 12-666Para. 345.2.3(b), Flanged Joints (B31.3-2010) . 24-19 13-620Para. 345.2.3(c), Closure Welds (B31.3-2012) . 24-25 13-1499Para. K328.2.1(b), Welding Qualifications (B3
13、1.3-2010) 24-06 12-623Para. K328.2.1(d), Welding Qualifications (B31.3-2010) 24-17 13-474Random Examination (B31.3-2012) . 24-20 13-704Table 302.3.5, Weld Joint Strength Reduction Factor, W (B31.3-2010) 24-12 12-1728Table 323.2.2, Low Temperature Toughness Tests for Metals (B31.3-2008) . 24-27 13-15
14、48Table 323.2.2, Notes (3) and (5), Impact Testing (B31.3-2010) 24-01 12-57Table 323.3.1, Impact Testing for Metals (B31.3-2010) . 24-14 12-2057Table 323.3.1, Impact Testing Requirements for Metals (B31.3-2008) 24-28 13-1549Table 341.3.2, Acceptance Criteria (B31.3-2010) 24-03 12-241Table 341.3.2 an
15、d Paras. 341.4.1, 341.4.2, and M341.4, Radiography forFillet Welds (B31.3-2010) 24-02 12-102I-2ASME B31.3 INTERPRETATIONSInterpretation 24-01Subject: Table 323.2.2, Notes (3) and (5), Impact Testing (B31.3-2010)Date Issued: April 30, 2012File: 12-57Question: In accordance with ASME B31.3-2010, if a
16、material meets the requirements ofTable 323.2.2, Note (3) exception to impact testing requirements, does it matter what size specimenis obtainable as described in Note (5)?Reply: No.Interpretation 24-02Subject: Table 341.3.2 and Paras. 341.4.1, 341.4.2, and M341.4, Radiography for Fillet Welds(B31.3
17、-2010)Date Issued: April 30, 2012File: 12-102Question: In accordance with ASME B31.3-2010, is it a requirement to perform radiographyon fillet welds?Reply: No.Interpretation 24-03Subject: Table 341.3.2, Acceptance Criteria (B31.3-2010)Date Issued: April 30, 2012File: 12-241Question: In accordance wi
18、th ASME B31.3, if indications are detected in the base metal or aweld not required to be examined, are the indications required to be evaluated?Reply: The Code does not specifically address this issue. However, the Introduction states thatthe owner is responsible for imposing requirements supplement
19、ary to those of the Code ifnecessary to assure safe piping for the proposed installation. Also see para. 300(c)(4).I-3ASME B31.3 INTERPRETATIONSInterpretation 24-04Subject: Fig. 323.2.2B, Design Minimum Temperature According to ASME B31T (B31.3-2010)Date Issued: April 30, 2012File: 12-243Question (1
20、): In accordance with ASME B31.3-2010, may Fig. 323.2.2B be used for impact-testedmaterials in the same manner as described in the ASME BPV Code rules?Reply (1): No. See interpretation 20-13R.Question (2): In accordance with ASME B31.3-2010, is the use of ASME B31T, StandardToughness Requirements fo
21、r Piping, mandatory?Reply (2): No.Question (3): In accordance with ASME B31.3-2010, does Fig. 323.2.2B apply to UNS S31803(22Cr duplex)?Reply (3): No.Interpretation 24-05Subject: Para. 340.4(a), Owners Inspectors (B31.3-2010)Date Issued: April 30, 2012File: 12-499Background: An EPC (Engineering, Pro
22、curement, and Construction) contractor has beenawarded a contract to engineer, procure, construct, and install a pressure piping system.Question (1): Does ASME B31.3 allow an EPC contractor to act as the owners inspector untilthe piping system is complete and ready to be turned over to the owner?Rep
23、ly (1): No.Question (2): Does ASME B31.3 allow the owner to designate in writing an employee of theEPC contractor to act as the owners inspector until the piping system is complete and ready tobe turned over to the owner?Reply (2): No.I-4ASME B31.3 INTERPRETATIONSInterpretation 24-06Subject: Para. K
24、328.2.1(b), Welding Qualifications (B31.3-2010)Date Issued: April 30, 2012File: 12-623Question (1): In accordance with ASME B31.3-2010, is a separate qualification of the weldingprocedure required for each combination of base material specification(s) forming a joint inChapter IX, High Pressure Pipi
25、ng, even if the material type or grade remains the same?Reply (1): Yes; see para. K328.2.1(b).Question (2): In accordance with ASME B31.3-2010, if a welded joint comprised of two differentmaterial specifications with the same type or grade in Chapter IX, High Pressure Piping, isqualified, does the w
26、elding procedure also qualify welding of each individual base material toitself?Reply (2): No; see para. K328.2.1(b).I-5ASME B31.3 INTERPRETATIONSInterpretation 24-07Subject: Para. 345.2.2(a), Examination During Leak Testing (B31.3-1996 Edition ThroughB31.3-2010)Date Issued: October 5, 2012File: 12-
27、56, 12-666Question (1): In accordance with ASME B31.3-1996 Edition through ASME B31.3-2010, para.345.2.2(a), must examination for leaks be performed in accordance with the visual examinationmethod in para. 344.2?Reply (1): No.Question (2): Other than sensitive leak testing, do ASME B31.3-1996 Editio
28、n throughASME B31.3-2010, define leak testing examination requirements?Reply (2): No.Question (3): In accordance with ASME B31.3-1996 Edition through ASME B31.3-2010, para.345.2.2(a), must personnel performing the examination for leaks be qualified for visual examina-tion per paras. 342.1 or 344.2?R
29、eply (3): No.Question (4): In accordance with ASME B31.3-1996 Edition through ASME B31.3-2010, para.345.2.2(a), must leak testing be performed in accordance with a written procedure for visualexamination?Reply (4): No.Question (5): Other than sensitive leak testing, do ASME B31.3-1996 Edition throug
30、hASME B31.3-2010 require compliance with the requirements of ASME BPV Code Section V,Articles 9 or 10 for leak testing?Reply (5): No.Question (6): In accordance with ASME B31.3-1996 Edition through ASME B31.3-2010, duringa hydrostatic leak test, if the examiner is satisfied that the requirements of
31、para. 345.2.2(a) aremet, is a 100% visual examination (i.e., a visual examination of 360 deg of the pipe or jointsurface) of each joint or connection required?Reply (6): No.Interpretation 24-08Subject: Para. 341.4.1(b), Sample Examinations (B31.3-2010)Date Issued: October 5, 2012File: 12-1071Questio
32、n: If one welder makes the tack welds in a circumferential butt weld and another welderwelds the root pass and remainder of the weld, is it required that the welder who made the tackwelds be represented in the sample examinations required by para. 341.4.1(b) or the progressivesampling of para. 341.3
33、.4?Reply: No.I-6ASME B31.3 INTERPRETATIONSInterpretation 24-09Subject: Para. 304.7.2, Pressure Design (B31.3-2010)Date Issued: October 5, 2012File: 12-1504Question: In accordance with ASME B31.3-2010, para. 307.1.2, Unlisted Valves, if valve pressuretemperature ratings are established by the method
34、set forth in ASME B16.34, Appendix B, is itnecessary to qualify the pressure design in accordance with ASME B31.3, para. 304.7.2?Reply: No.Interpretation 24-10Subject: Para. 328.5.4, Welded Branch Connections (B31.3-2010)Date Issued: October 5, 2012File: 12-1584Question: In ASME B31.3-2010, for the
35、installation of instrument tap type branch connections,do the weld types specified in ASME Section VIII, Division 1, UW-15(b) (i.e., welds that requireno strength calculations) and corresponding acceptable welding types shown in UW-16, whichinclude not-fully-penetrated branch connection groove welds
36、, comply with the acceptable weldingdetails shown in ASME B31.3, para. 328.5.4?Reply: No; however, see para. 300(c)(3).Interpretation 24-11Subject: Para. 345, Pneumatic Leak Testing (B31.3-2010)Date Issued: October 5, 2012File: 12-1610Question: In accordance with ASME B31.3-2010, para. 345.5.4(a), w
37、ith or without the ownersapproval, does the Code permit pneumatic testing in excess of 1.33 times the design pressure?Reply: No; however, see para. 300(c)(3).I-7ASME B31.3 INTERPRETATIONSInterpretation 24-12Subject: Table 302.3.5, Weld Joint Strength Reduction Factor, W (B31.3-2010)Date Issued: Octo
38、ber 5, 2012File: 12-1728Question (1): In accordance with ASME B31.3-2010, Table 302.3.5, is the weld strength reductionfactor, W, for P91 alloy steel material (CSEF subcritical) at 950F equal to 0.5?Reply (1): Yes.Question (2): In accordance with ASME B31.3-2010, Table 302.3.5, should the weld stren
39、gthreduction factor, W, for P91 alloy steel material be the same value as in ASME B31.1-2010?Reply (2): The ASME B31.3 Committee is unable to provide the information you have requested.The Committee does not respond to requests for rationale. Code rules reflect not only technicaldata and safety crit
40、eria, but also the collective experience of the Committee members. Interdepen-dence of rules in various Chapters also plays a part in any given requirement.If you believe, however, that a particular Code rule or rules may benefit from considerationof new or additional data and approaches, the Commit
41、tee welcomes your desire to contribute.We invite you to submit pertinent material for transmittal to the Code Section Committee involved.If you desire, an invitation can be extended for you to attend a meeting of the Committee atwhich the material will be discussed. We appreciate your interest.I-8AS
42、ME B31.3 INTERPRETATIONSInterpretation 24-13Subject: Chapter IX, High Pressure Piping (B31.3-2012)Date Issued: April 15, 2013File: 12-1782Question (1): Does ASME B31.3-2012 require compliance with Chapter IX, High Pressure Piping,under any circumstance other than when such compliance is specified by
43、 the owner?Reply (1): No; see para. K300(a).Question (2): Does ASME B31.3-2012 require that piping designed for a pressure in excess ofthat allowed by ASME B16.5, Class 2500 rating for the specified design temperature and materialgroup be designed in accordance with Chapter IX if the piping system i
44、s not designated by theowner as being in High Pressure Fluid Service?Reply (2): No; see para. K300(a).Interpretation 24-14Subject: Table 323.3.1, Impact Testing for Metals (B31.3-2010)Date Issued: April 15, 2013File: 12-2057Question (1): Do rows 4 through 7 of Table 323.3.1 of ASME B31.3-2010 apply
45、to welds usedin the manufacture of piping components?Reply (1): No.Question (2): Do rows 1 through 3 of Table 323.3.1 of ASME B31.3-2010 apply to welds usedin the manufacture of piping components?Reply (2): Yes.Interpretation 24-15Subject: Para. 328.5.4 and Fig. 328.5.4D, Welded Branch Connection (B
46、31.3-2010)Date Issued: April 15, 2013File: 13-76Question: Does ASME B31.3-2010 permit the use of a complete (full) encirclement split-tee asa branch connection, where a branch pipe is butt welded to the branch opening of the split-tee,if the requirements of paras. 303 and 304.7.2 are met?Reply: Yes.
47、 See also paras. 300(c)(3) and 300(c)(4).Interpretation 24-16Subject: Para. 322.6.3, Relief Devices (B31.3-2012)Date Issued: April 15, 2013File: 13-266Question: Does ASME B31.3 require that all relief devices that meet para. 322.6.3 but not API 526be evaluated as unlisted components?Reply: Yes; see
48、para. 302.2.3.I-9ASME B31.3 INTERPRETATIONSInterpretation 24-17Subject: Para. K328.2.1(d), Welding Qualifications (B31.3-2010)Date Issued: April 15, 2013File: 13-474Question (1): In accordance with ASME B31.3-2010, para. K328.2.1(d), if transverse tensile testingis required for a full penetration gr
49、oove weld test coupon for Welding Procedure Qualification inaccordance with the ASME BPV Code, Section IX, shall yield strength be determined on thetransverse tensile test coupon?Reply (1): Yes.Question (2): In accordance with ASME B31.3-2010, para. K328.2.1(d), shall all-weld-metaltensile testing be conducted and the yield strength of the weld be determined if transversetensile testing is required for a full penetration groove weld test coupon for Welding ProcedureQualification in accordance with the ASME BPV Code, Section IX?Reply (2): No, unless the filler metal is not yet incorporat
