1、ASME B31.4 INTERPRETATIONSASME B31.4INTERPRETATIONS NO. 9Replies to Technical InquiriesOctober 7, 2008 Through May 15, 2012It has been agreed to publish interpretations issued by the B31 Committee concerning B31.4as part of the update service to the Code. The interpretations have been assigned numbe
2、rs inchronological order. Each interpretation applies either to the latest Edition or Addenda at thetime of issuance of the interpretation or the Edition or Addenda stated in the reply. Subsequentrevisions to the Code may have superseded the reply.These replies are taken verbatim from the original l
3、etters, 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 interpretation number with the suffix
4、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 that the inquirer believes might affect the inter
5、pretation. Further, personsaggrieved by an interpretation may appeal to the cognizant ASME committee or subcommittee.As stated in the Statement of Policy in the Code documents, ASME does not “approve,” “certify,”“rate,” or “endorse” any item, construction, proprietary device, or activity.For detaile
6、d instructions on preparations of technical inquiries to the B31 Committee, refer toNonmandatory Appendix A.Interpretations No. 1 was included with ANSI/ASME B31.4c-1986. Interpretations No. 2 wasincluded with ASME B31.4a-1987. Interpretations No. 3 was included with ASME B31.4a-1991.Interpretations
7、 No. 4 was included with ASME B31.4a-1994. Interpretations No. 5 was includedwith ASME B31.4-1998. Interpretations No. 6 was included with B31.4a-2001. Interpretations No. 7was included with ASME B31.4-2002. Interpretations No. 8 was included with ASME B31.4-2009.I-1Copyright ASME International Prov
8、ided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ASME B31.4 INTERPRETATIONSB31.4Subject Interpretation File No.Paragraph 423.2.3 and Table 423.1-1, Mandatory Impact Testing. 4-89 10-1604Paragraph 434.8, Previously Qualified Weldin
9、g Procedures . 4-86 09-1450Paragraph A410.1, Pig Launcher/Receiver 4-87 10-809Paragraphs 402.3 and 403.2.1, Hoop Stress and Nominal Wall Thickness . 4-88 10-1154I-2Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without licen
10、se from IHS-,-,-ASME B31.4 INTERPRETATIONSInterpretation: 4-86Subject: Paragraph 434.8, Previously Qualified Welding Procedures (ASME B31.4-2006 Edition)Date Issued: October 20, 2009File: 09-1450Question (1): Is it the intention of B31.4-2006, para. 434.8, that the pipeline owner/operatorsupply the
11、contractor with the owners pre-qualified Welding Procedure Specification andProcedure Qualification Record for use on a project?Reply (1): No.Question (2): Is it acceptable per B31.4 for the contractor to perform welding on a pipeline/metering station using his own previously qualified Welding Proce
12、dure Specification if all of theessential variables are the same?Reply (2): Yes, provided that the procedure is approved by the owner, as per para. 434.8.3(b)(2).Interpretation: 4-87Subject: Paragraph A410.1, Pig Launcher/ReceiverDate Issued: June 7, 2010File: 10-809Question: Does any part of a pig
13、launcher/receiver need to be stamped in accordance withSection VIII, Div. 1 or 2?Reply: No. Please see paras. 404.7.1 and 404.7.3 of B31.4-2009.Interpretation: 4-88Subject: Paragraphs 402.3 and 403.2.1, Hoop Stress and Nominal Wall Thickness(ASME B31.4-2009 Edition)Date Issued: July 28, 2010File: 10
14、-1154Question (1): Should the hoop stress be calculated per para. 402.3 of B31.4-2009?Reply (1): Yes.Question (2): Should the nominal wall thickness be calculated per para. 403.2.1?Reply (2): Yes.I-3Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or
15、 networking permitted without license from IHS-,-,-ASME B31.4 INTERPRETATIONSInterpretation: 4-89Subject: Paragraph 423.2.3 and Table 423.1-1, Mandatory Impact Testing (ASME B31.4-2009Edition)Date Issued: September 29, 2010File: 10-1604Question: In B31.4-2009, is impact testing only mandatory for th
16、e materials listed under “Pipe”in Table 423.1-1?Reply: Yes.I-4Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ASME B31.4 INTERPRETATIONSASME B31.4INTERPRETATIONS NO. 8Replies to Technical Inquirie
17、sJune 12, 2002 Through October 6, 2008It has been agreed to publish interpretations issued by the B31 Committee concerning B31.4as part of the update service to the Code. The interpretations have been assigned numbers inchronological order. Each interpretation applies either to the latest Edition or
18、 Addenda at thetime of issuance of the interpretation or the Edition or Addenda stated in the reply. Subsequentrevisions to the Code may have superseded the reply.These replies are taken verbatim from the original letters, except for a few typographical andeditorial corrections made for the purpose
19、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 interpretation number with the suffix R is presented. In the case wherean interpretation is corrected by Errata, the origin
20、al interpretation number with the suffix E is used.ASME procedures provide for reconsideration of these interpretations when or if additionalinformation is available that the inquirer believes might affect the interpretation. Further, personsaggrieved by an interpretation may appeal to the cognizant
21、 ASME committee or subcommittee.As stated in the Statement of Policy in the Code documents, ASME does not “approve,” “certify,”“rate,” or “endorse” any item, construction, proprietary device, or activity.For detailed instructions on preparations of technical inquiries to the B31 Committee, refer toN
22、onmandatory Appendix A.Interpretations No. 1 was included with ANSI/ASME B31.4c-1986. Interpretations No. 2 wasincluded with ASME B31.4a-1987. Interpretations No. 3 was included with ASME B31.4a-1991.Interpretations No. 4 was included with ASME B31.4a-1994. Interpretations No. 5 was includedwith ASM
23、E B31.4-1998. Interpretations No. 6 was included with B31.4a-2001. Interpretations No. 7was included with ASME B31.4-2002.I-1Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ASME B31.4 INTERPRETATI
24、ONSB31.4Subject Interpretation File No.400.1.1, Injection Flow Lines. 4-84 07-1459402.3.1, Design Factor 4-79 03-331404.1, Pipe Design Conditions . 4-76 02-3680404.1.2, Design Factor and Residual Stresses 4-81 02-3682421.1, 20% SMYS. 4-77 02-2486421.1 and 423.2.3, Hoop Stress . 4-85 08-417423.2.3, I
25、mpact Testing A 106 4-83 07-1458434.8.5, NDE Inspection Requirements 4-78 02-2487451.6.2, Repairing a Dent . 4-80 02-3681451.6.2, Defect Length 4-82 05-1581I-2Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license fr
26、om IHS-,-,-ASME B31.4 INTERPRETATIONSInterpretation: 4-76Subject: Pipe Design Conditions (ASME B31.4-1989 Edition)Date Issued: June 12, 2002File: 02-3680Question: Is it right that the equation defined in para. 404.1 (tnp t + A) fully covers thenegative pipe wall thickness tolerances as defined in AP
27、I 5L; therefore, the minus tolerance aspermitted by API 5L does not have to be deducted from the nominal pipe wall thickness usedfor calculation of allowable internal pressure?Reply: Yes.Interpretation: 4-77Subject: Paragraphs 421.1, 434.8.5, and 437Date Issued: December 19, 2002File: 02-2486Questio
28、n (1): Should the reference to operating above 20% SMYS in para. 421.1(d) actuallyreference operating at a hoop stress of more than 20% SMYS?Reply (1): Yes.Question (2): Does the reference of hoop stress in paras. 434.8.5(a)(4), 437.1.4(a)(2) and (3),and 437.4.1(a) mean only the circumferential stre
29、ss due to internal pressure as calculated inpara. 404.1.2?Reply (2): Yes.Interpretation: 4-78Subject: Paragraph 434.8.5Date Issued: December 19, 2002File: 02-2487Question (1): Are there NDE inspection requirements in para. 434.8.5(a)(4) for pipelines to beoperated at a hoop stress of 20% or less of
30、SMYS?Reply (1): No; see para. 436.5 for inspection requirements.Question (2): Do the requirements for complete inspection of girth welds in the locations orconditions detailed in paras. 434.8.5(a)(4)(a) through (f) apply only for pipelines to be operatedat a hoop stress of more than 20% of SMYS?Repl
31、y (2): Yes.I-3Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ASME B31.4 INTERPRETATIONSInterpretation: 4-79Subject: Paragraphs 434.13.4(c) and 451.9(a)Date Issued: December 19, 2002File: 03-331Qu
32、estion (1): Should the design factor for the use in API 1102 para. 4.8.2, Checks for Fatigue,be the same as the design factor in B31.4 para. 402.3.1?Reply (1): Yes.Question (2): Should the references to circumferential stresses and total stress in para. 451.9(a)actually be references to effective st
33、ress as per para. 434.13.4(c)?Reply (2): Yes.Interpretation: 4-80Subject: Paragraph 451.6.2(b)(3)Date Issued: February 20, 2003File: 02-3681Question: Does B31.4 (1998 Ed. as revised) permit repairing a scratch, gouge, or groove in adent by grinding the scratch, gouge, or groove out to a smooth conto
34、ur and evaluating theresulting metal loss similarly to metal loss from corrosion?Reply: No.Interpretation: 4-81Subject: Paragraph 404.1.2Date Issued: February 20, 2003File: 02-3682Question: Does the design factor include allowance for residual stresses that may be presentin the pipes manufactured in
35、 accordance with API 5L, specifically helical seam submerged arcwelded pipes?Reply: Yes.I-4Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ASME B31.4 INTERPRETATIONSInterpretation: 4-82Subject: Pa
36、ragraph 451.6.2(a)(7)Date Issued: January 16, 2006File: 05-1581Question (1): For the equation found in para. 451.6.2(a)(7), does the defect length, L, representthe length of the defect measured longitudinally along the pipeline axis or can it be measuredcircumferentially?Reply (1): No, L cannot be m
37、easured circumferentially.Question (2): If a defect in a pipeline is38in. along the pipeline axis but 14 in. circumferentially,can the equation found in para. 451.6.2(a)(7) be applied using the circumferential length of thedefect to represent the parameter L in the equation?Reply (2): No, the parame
38、ter L remains38in.Interpretation: 4-83Subject: Paragraph 423.2.3Date Issued: January 25, 2008File: 07-1458Question: If ASTM A 106 pipe is operating over 7,000 psi (20% of 35,000 psi), shall the materialbe impact tested?Reply: Yes.Interpretation: 4-84Subject: Injection Flow LinesDate Issued: February
39、 12, 2008File: 07-1459Question (1): Are flow lines between oilfield injection wells and oilfield injection facilitiesexcluded from the Scope of ASME B31.4?Reply (1): No.Question (2): Are flow lines between oil production wells and oilfield separation facilitiesexcluded from the scope of ASME B31.4?R
40、eply (2): No.Interpretation: 4-85Subject: Paragraphs 421.1(d) and 423.2.3Date Issued: March 25, 2008File: 08-417Question: In paras. 421.1(d) and 423.2.3, does 20% SMYS refer to the hoop stress?Reply: Yes.I-5Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reprodu
41、ction or networking permitted without license from IHS-,-,-ASME B31.4 INTERPRETATIONS NO. 5 Replies to Technical Inquiries January 1,1994, Through December 31,1997 It has been agreed to publish intepretations issued by the B31 Committee concerning B31.4 as part of the update service to the Code. The
42、 interpretations have been asssigned numbers in chronological order. Each interpretation applies either to the latest Edition or Addenda at the time of issuance of the interpretation or the Edition or Addenda stated in the reply. Subsequent revisions to the Code may have superseded the reply. These
43、replies are taken verbatim from the original letters, except for a few typographical and editorial corrections made for the purpose of improved clarity. In some instances, a review of the interpretation revealed a need for corrections of a technical nature. In these cases, a revised reply bearing th
44、e original interpretation number with the suffix R is presented. In the case where an 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 additional information is availab
45、le which the inquirer believes might affect the interpretation. Further, persons aggrieved by an interpretation may appeal to the cognizant ASME committee or subcommittee. As stated in the Statement of Policy in the Code documents, ASME does not “approve,” “certify,” “rate,” or “endorse” any item, c
46、onstruction, proprietary device, or activity. For detailed instructions on preparations of technical inquiries to the B31 Committee, refer to Appendix B. Interpretations No. 1 was included with ANSVASME B31.4-1986. Interpretations No. 2 was included with ASME B31.4a-1987. Interpretations No. 3 was i
47、ncluded with ASME B31.4a-1991. Interpretations No. 4 was included with ASME B31.4a-1994. 45 Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-B31.4 Subject . 401.2.2, Internal Design Pressure; 402.3
48、, Allowable Stresses and Other Stress Limits; 404.1.2, Straight Pipe Under Internal Pressure 401.6, Weight Effects; 402.3, Allowable Stresses and Other Stress Limits 406.2.2, Mitered Bends . 419.7.3(b), Expansion and Flexibility Analysis; Fig . 419.6.4(c), Flexibility Factor k and Stress Intensifica
49、tion Factor i 434.8.6(a), Butt Welds; Fig . 434.8.6(a)-(2), Acceptable Butt Welded Joint Design for Unequal Wall Thicknesses . 435.5, Auxiliary Liquid Petroleum. Liquid Anhydrous Ammonia, 451.6.2(a)(7), Disposition of Defects Certification of a Listed Material to Another Listed Material Specification . Fi
