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 Subsequentrevisions to the Code may have superseded the reply.These replies are taken verbatim from the original l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-1ASME B31.4 INTERPRETATIONSB31.4Su
8、bject Interpretation File No.Paragraph 423.2.3 and Table 423.1-1, Mandatory Impact Testing. 4-89 10-1604Paragraph 434.8, Previously Qualified Welding 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 . 4-8
9、8 10-1154I-2ASME 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 cont
10、ractor 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 Procedure
11、 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 laun
12、cher/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: 10-115
13、4Question (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-3ASME B31.4 INTERPRETATIONSInterpretation: 4-89Subject: Paragraph 423.2.3 and Table 423.1-1, Mandatory Imp
14、act Testing (ASME B31.4-2009Edition)Date Issued: September 29, 2010File: 10-1604Question: In B31.4-2009, is impact testing only mandatory for the materials listed under “Pipe”in Table 423.1-1?Reply: Yes.I-4ASME B31.4 INTERPRETATIONSASME B31.4INTERPRETATIONS NO. 8Replies to Technical InquiriesJune 12
15、, 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 Addenda
16、 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 of impro
17、ved 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 original inter
18、pretation 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 ASME co
19、mmittee 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 toNonmandat
20、ory 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 ASME B31.4-
21、1998. Interpretations No. 6 was included with B31.4a-2001. Interpretations No. 7was included with ASME B31.4-2002.I-1ASME B31.4 INTERPRETATIONSB31.4Subject 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 02-3680
22、404.1.2, 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, Impact 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-2A
23、SME 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 API 5L; theref
24、ore, 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: 02-2486Question (1): Shoul
25、d 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 stress due to in
26、ternal 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 SMYS?Reply (
27、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?Reply (2): Yes.I
28、-3ASME B31.4 INTERPRETATIONSInterpretation: 4-79Subject: Paragraphs 434.13.4(c) and 451.9(a)Date Issued: December 19, 2002File: 03-331Question (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.
29、Question (2): Should the references to circumferential stresses and total stress in para. 451.9(a)actually be references to effective stress 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 (19
30、98 Ed. as revised) permit repairing a scratch, gouge, or groove in adent by grinding the scratch, gouge, or groove out to a smooth contour and evaluating theresulting metal loss similarly to metal loss from corrosion?Reply: No.Interpretation: 4-81Subject: Paragraph 404.1.2Date Issued: February 20, 2
31、003File: 02-3682Question: Does the design factor include allowance for residual stresses that may be presentin the pipes manufactured in accordance with API 5L, specifically helical seam submerged arcwelded pipes?Reply: Yes.I-4ASME B31.4 INTERPRETATIONSInterpretation: 4-82Subject: Paragraph 451.6.2(
32、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 measured circumfe
33、rentially.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 parameter L remains38i
34、n.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 12, 2008File: 0
35、7-1459Question (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?Reply (2): No.Int
36、erpretation: 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-5ASME B31.4 INTERPRETATIONS NO. 5 Replies to Technical Inquiries January 1,1994, Through December 31,1997 It h
37、as been agreed to publish intepretations issued by the B31 Committee concerning B31.4 as part of the update service to the Code. The 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
38、interpretation or the Edition or Addenda stated in the reply. Subsequent revisions to the Code may have superseded the reply. These 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 instanc
39、es, a review of the interpretation revealed a need for corrections of a technical nature. In these cases, a revised reply bearing the 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
40、 suffix E is used. ASME procedures provide for reconsideration of these interpretations when or if additional information is available which the inquirer believes might affect the interpretation. Further, persons aggrieved by an interpretation may appeal to the cognizant ASME committee or subcommitt
41、ee. 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 to Appendix B. Interpretation
42、s No. 1 was included with ANSVASME B31.4-1986. Interpretations No. 2 was included 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. 45 B31.4 Subject . 401.2.2, Internal Design Pressure; 402.3, Allowable Stresses
43、 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 Intensification Factor i 434.8.
44、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 . Figure 434.8.6(a
45、)-(2), Acceptable Butt Welded Joint Design for Unequal Wall Thicknesses. Note (1) . Fully Welded Partial Encirclement Half Soles in an Oil Pipeline . Mill Certificates; 402. Design Criteria; 436. Inspection . Requirements for Re-converting a Steel Pipelines Function . Temperature Limitations for Und
46、erground Ethylene Pipelines or Liquid Alcohol Piping . Interpretation 4-66 4-56 4-60 4-6 I 4-57 4-55 4-65 4-62 4-64 4-59 4-67 4-58 4-63 File No . B31-97-011 B3 1-93-054 B31-97-007 B3 1-97-008 B3 1-94-032 B31-93-056 B31-97-005 B3 1-94-035 B31 1-95-05 B3 1-97-006 B31 -97-023 831-94-054 B31-94-047 47 S
47、TD-ASME B31.V INT NO= 5-ENGL m 0757b70 Ob09314 723 m 831.4 Interpretations No. 5 4-55. 4-56 Interpretation: 4-55 Subject: ASME B31.4-1992 Edition, Para. 435.5, Auxiliary Liquid Petroleum, Liquid Anhydrous Ammonia, or Liquid Alcohol Piping Date Issued: May 3 1, 1994 File: B3 1-93-056 Question: In acc
48、ordance with ASME B31.4, para. 434.5(a), does B31.4 prohibit a manufacturer of full- encirclement welded split tees from repairing notches, grooves, gouges, and blowouts by welding? Reply: No. Interpretation: 4-56 Subject: ASME B31.4-1992 Edition, Para. 401.6, Weight Effects, Para. 402.3, Allowable
49、Stresses and Other Stress Limits Date Issued: April 23, 1997 File: B31-93-054 Question: For an exposed submarine pipeline resting on the seafloor and where it can not be conclusively proven that hydrotesting has removed the longitudinal stresses due to pipeline route curvature, should the stress due to curvature be accounted for in the equivalent tensile stress calculation which is required to be less than 09SMYS in the restrained section para. 402.3.2(c) and less than 75% of the allowable stress value para. 402.3.2(d)? Reply: Yes. 49 STD-ASME B31-4 INT NO- 5-ENGL W 0759b70 Ob07315 Bb
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