ASME B31.3 INTERPRETATIONS NO. 13

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1 /. '.... _,' ASME B31.3 INTERPRETATIONS NO Replies to Technical Inquiries April 1, 1994, Through March 31, 1995 General Information It has been agreed to publish interpretations issued by the B31 Committee concerning B31.3 as part of the update service to the Code. The interpretations have been assigned numbers in chronological order. Each interpretation applies to the Edition or Aqdenda stated in the interpretation, or if none is stated, to the Edition or Addenda in effect on the date of issuance of the interpretation. Subsequent revisions to the Code may have superseded the reply. These interpretations are not part of the Code or its Addenda. 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 instances, 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. 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 subcommittee. As stated in the Statement of Poli~ in the Code documents, ASME does not "approve," "certify," "rate," or "endorse" any item, construction, proprietary device, or activity. For detailed instructions on preparaion of technical inquiries to the B31 Committee, refer to Appendix Z. Code Reference and Subject Indexes Code Reference and Subject Indexes have been prepared to assist. the user in locating interpretations by location or by subject matter in the Code. They cover interpretations issued from Volume 1 up to and including the present volume, and will be updated with each volume. 147

2 : ~.. '. -: Subject Alteration of Existing Piping and Hot Tapping '. Certification of a Listed Material to Another Listed Material Specification. Paras and , Design Pressure. Para (a), Pressure Design of Straight Pipe. Para , Pressure Design of Unlisted Components and Elements. Paras. 304,7.2 and (d), Pressure Design of Unlisted Components and Elements. Paras and , Pressure Design and Flexibility Factors. Para , Flexibility Analysis. Para , Preparation for Welding. Para , Welded Branch Connections. Chapter VI Inspection, Examination, and Testing. Para (e), Progressive Examination. Para (a), Hydrostatic Test Requirements. Para , Pneumatic Testing. Para. A , Heat Fusion Joints in Thermoplastic Piping. Appendix X, Para. X3.2.2, Metallic Bellows Expansion Joints. Intery,retation '()2 13'()3 '13-05, '() : ,13.Q File No Q34 B B31 94'() () ()37 B31 94.() Q " /",-.. :; ~ t : '. " -: ,. l.:.~ ~~. ' ~, " i; 149

3 B31.3 Interpretations No , 13-62, Interpretation: ASME B Edition, Para , Preparation for Welding B Question: In accordance with ASME B Edition, Addenda a, does the Code require that all transitional tapers be filled with weld metal to obtain a consistent outside diameter when welding together two weld end components that are manufactured to include all of the following: (1) a weld bevel to nominal wall thickness; (2) an actual outside diameter greater than the nominal outside diameter; (3) a taper transition from the actual outside diameter to the nominal outside diameter weld bevel per ASME BI6.25, Fig. 1.. Reply: No, the weld must have at least the same nominal wall thickness as the thinner of the two components. Interpretation: ASME B Edition, Para , Pressure Design of Unlisted Cqmponents and Elements Date Issued: Nov~mber 21, 1994 B Question: In accordance with ASME B Edition, para , may the maximum allowable pressure of an unlisted component be greater than the manufacturer's rating? Reply: Yes, see para. 300(c)(2). Interpretation: ASME B Edition, Paras and (d), Pressure Design of Unlisted Components and Elements B Question: In accordance with ASME B Edition, is a proof pressure test, in accordance with para (c), required to qualify a flange design not in accordan~ with a listed standard if the design meets the requirements of para (d) as well as the introductory requirements of para ? Reply: No. 151

4 13 04, 13.05, B31.3 Interpretations No. 13 Interpretation: ASME B Edition, Alterations of Existing Piping and Hot Tapping r... \;.' ',~:" B Question: Does ASME B Edition and Addenda a apply to alterations of existing piping, including tie-in branch connections, e.g., hot taps? ' Reply: No. Interpretation: ASME B Edition, Para , Pressure Design qfunlisted Components and Elements, and Para Flexibility and Stress Intensification Factors B Question (1): In accordance with ASME B Edition, maya pressure containing piping component, not manufactured in accordance with a listed standard, and for which the rules in para. 304 do not apply, be qualified in accordance with para ? Reply'(1): Yes. Question (2): In accordance with para , may stress intensification factors for pressure containing piping components~ not manufactured in accordance with a listed standard listed in Appendix D, be established by fatigue testing? Reply (2): Yes. Interpretation: ASME B Edition, Para , Pneumatic Testing B Question: In accordance with ASME B Edition and Addenda a, is it allowable to pneumatically test above 110% of design pressure? Reply: No, unless otherwise specified in the engineering design.,', " " 152

5 B31.3 Interpretations No , Interpretation: ASME B Edition, Para (a), Pressure Design of Straight Pipe B Question: In accor.dance with ASME B Edition, may the minimum pipe wall thickness determined by measurement be used to satisfy the requirements of para, (a)? Reply: Yes. Interpretation: ASME B Edition, Para. A , Heat Fusion Joints in Thermoplastic Piping B Question: Does ASME B Edition, para. A , apply to electrofusion bonding of polyolefin pipe and fittings? Reply: No. Eleetrofusion joints are not listed; see para. A

6 13 09, B31.3 Interpretations No. 13 Interpretation: ASME B Edition, Appendix X, Para. X3.2.2, Metallic Bellows Expansion Joints B Question (1): In accordance with ASME B Edition, para. X3.2.2, is it required to examine inaccessible surfaces of the bellows longitudinal seam weld after forming using liquid penetrant? Reply (1): No. Question (2): Is a dye penetrant leak test (putting dye penetrant on :the inside surface and developer on the weld outside surface) an acceptable alternative to liquid p~netrant examination of the inside surface of bellows longitudinal seam welds? Reply (2): No. Question (3): Are the rules in ASME Section VIII, Division 1, Appendix 26, applicable to bellows in ASME B31.3 piping systems? Reply (3): No. Interpretation: ASME B Edition, Certification of a Listed Material to Another Listed Material Specification. B Question: Is it permissible under the requirements of ASME B Edition for an organization to recertify a listed material to another listed material specification? Reply: B31.3 does not establish rules for materials certification other than the requirements of the materials specifications. 154

7 B31.3 Interpretations No , 13.12, Interpretation: ASME B Edition, Para , Welded Branch Connections B Question: In accordance with ASME B Edition, Addenda a, what is the effective weld throat thickness required for a proprietary integrally reinforced branch 'connection fitting? Reply: The thickness is as required by the manufacturer's design qualified in accordance with para or MSS SP-94, and para (d). Interpretation: ASME B Edition, Para (e), Progressiv~ Examination B Question: In accordance with ASME B Edition, para (e), what is the meaning of the phrase "all items represented by the progressive examinations."? Reply: All items withia- the same designated lot. See para Definitions, random exami nations. Interpretation: ASME B Edition, Para (a), Hydrostatic Test Requirements B Question: Does ASME B Edition, Addenda a, permit a hydrostatic test pressure less than 1.5 times design pressure? Reply: No, unless para (c) or (b) applies. 155

8 13 14, 13 15, B31.3 Interpretations No. 13 Interpretation: ASME B Edition, Para , Flexibility Analysis ~...," \:1... "'., ~ B Question: In accordance with para , how many years of operatio~ or numberofoperating cycles are required to quil1ify a piping system as having a succ~ssful servic~ record? Reply: Such determination is the responsibility of the designer. See para. 300(b)(2). Interpretation: ASME B Edition, Paras and , Design Pressure B Question: When a valve isolates two process streams so that one condition on one side of the valve occurs at the same time as another condition occurs on the other side of the valve, are the requirements of paras and met if the pressure design is based on the most severe conditions of coincident pressure and component temperature? Reply: Yes. Interpretation: ASME B Edition, Chapter VI Inspection, Examination, and Testing B31-94-o59 Question (1): In accordance with ASME B Edition, Addenda a, if a weld has not penetrated to the inside comer of the root face on one side of the joint and the remainder of the weld is sound, does ASME B31.3 classify this defect as lack of fusion? Reply (1): No, refer to Fig sketch (c). Question (2): Can lack of fusion occur at the root of a groove weld joint? Reply (2): Yes. Question (3): Is 1.5 in. of incomplete penetration in any 6 in. weld length for girth and miter groove welds acceptable for normal fluid service? Reply (3): Yes, per acceptance criteria listed in Table A. 156

ASME B31.3 INTERPRETATIONS NO. 11

,..,.- r, ASME B31.3 INTERPRETATIONS NO. 11 Replies to Technical Inquiries April 1,1992, Through March 31,1993 'I General Information,It has been agreed to publish interpretations issued by the B31 Committee