ANSI ASME B16.5 INTERPRETATIONS-2002 Interpretations to B16.5 Pipe Flanges and Flanged Fittings (Includes Interpretations Through No 4).pdf
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1、ASME B16.5-2003 INTERPRETATIONSInterpretation No. 4Replies to Technical InquiriesJanuary 1, 1998 through December 31, 2002FOREWORDThis publication includes all of the written replies issued between the indicated dates by theSecretary, speaking for the ASME B16 Committee, Standardization of Valves, F
2、langes, Fittings,Gaskets, and Valve Actuators, to inquiries concerning interpretations of technical aspects of B16.5,Pipe Flanges and Flanged Fittings NPS12Through NPS 24 Metric/Inch Standard.These replies are taken verbatim from the original letters except for a few typographicalcorrections and som
3、e minor editorial corrections made for the purpose of improved clarity. Insome few instances, a review of the interpretation revealed a need for corrections of a technicalnature; in these cases, a corrected interpretation follows immediately after the original reply.These interpretations were prepar
4、ed in accordance with the accredited ASME procedures.ASME procedures provide for reconsideration of these interpretations when or if additionalinformation is available which the inquirer believes might affect the interpretation. Further,persons aggrieved by this interpretation may appeal to the cogn
5、izant ASME Committee orSubcommittee. ASME does not “approve,” “certify,” “rate,” or “endorse” any item, construction,proprietary device, or activity.I-1ASME B16.5-2003 4-1, 4-2, 4-3Interpretation: 4-1Subject: Hub DiameterDate Issued: March 13, 1998File: B16-97-011Question: According to ASME B16.5-19
6、96, does the diameter of hub dimension “X” as shownin Table 9, Fig. 9, correspond to the theoretical intersection of the angles line that represents theoutside of the hub with the line that represents the back of the flange?Reply: Yes. However, note this is a dimension without a tolerance.Interpreta
7、tion: 4-2Subject: ToleranceDate Issued: March 24, 1998File: B16-98-003Question: Does ASME B16.5-1996 have required tolerances for a lapped, slip-on, or socket-welding flange for the overall length through hub?Reply: No.Interpretation: 4-3Subject: Blind Flange MaterialDate Issued: March 24, 1998File:
8、 B16-98-004Question (1): May blind flanges covered by ASME B16.5-1996 be produced from plate?Reply (1): Yes.Question (2): May blind flanges produced from plate be marked in accordance with ASMEB16.5-1996?Reply (2): Yes, provided that they meet all the requirements of ASME B16.5-1996.Question (3): Do
9、es ASME B16.5-1996 have criteria for the selection of materials?Reply (3): No. See para. 5.1.1.I-24-4, 4-5, 4-6 ASME B16.5-2003Interpretation: 4-4Subject: Implementation of the Standard, Flange Face FinishDate Issued: July 21, 1998File: B16-097-015Question (1): Is there a mandatory date for the impl
10、ementation of ASME B16.5-1996?Reply (1): No. Implementation may be required by reference in a code, specification, salescontract, or public law.Question (2): May a flange not meeting the flange facing finish requirements of ASME B16.5-1996 but meeting those of an earlier edition be supplied as being
11、 in accordance with the 1996edition?Reply (2): Yes, provided that the flange face finish is supplied by arrangement with the purchaser.(See para. 6.4.4.)Question (3): According to ASME B16.5-1996, para. 6.4.4.3, may a flange with less than 45grooves per inch or more than 55 grooves per inch meet the
12、 flange facing finish requirements aslong as the resultant surface finish has a 125 to 250 H9262in. average roughness?Reply (3): Yes.Interpretation: 4-5Subject: Welding Neck FlangesDate Issued: June 18, 1999File: B16-99-004Question (1): Does ASME B16.5-1996 cover welding neck flanges that have the o
13、verall lengththrough hub dimension y greater than the specified values (e.g., long weld neck)?Reply (1): No.Question (2): Does para. 6.7.4 of ASME B16.5-1996 allow the conformance designation “B16”to be applied to long weld neck flanges having overall length through hub dimensions greaterthan specif
14、ied values?Reply (2): No. This paragraph applies to only end preparations.Interpretation: 4-6Subject: Blind Flange MaterialDate Issued: October 15, 2001File: B16-98-013Question (1): Does ASME B16.5-1996 allow blind flange made from a plate material listed inTable 1A to be designated as a forging mat
15、erial in Table lA?Reply (1): No.Question (2): Does ASME B16.5-1996 permit blind flanges to be of a plate material as listed inTable IA for all pressure classes covered in ASME B16.5-1996 (150, 300, 400, 600, 900, 1500, and2500)?Reply (2): Yes.I-3ASME B16.5-2003 4-7, 4-8, 4-9, 4-10Interpretation: 4-7
16、Subject: Materials ConformanceDate Issued: January 31, 2001File: B16-98-017Question: In accordance with ASME B16.5-1996, may a flange made from a material other thanthat of a material specification listed in Table lA be identified as being manufactured in accordancewith ASME B16.5?Reply: No.Interpre
17、tation: 4-8Subject: Material ConformanceDate Issued: January 31, 2001File: B16-99-03Question: May a flange meeting all of the relevant dimensional requirements of ASME B16.5-1996 that is integrally forged or cast to another product be marked as in para. 4.1.1 to indicateconformance to the B16.5 Stan
18、dard?Reply: No.Interpretation: 4-9Subject: Dual MarkingsDate Issued: January 31, 2001File: B16-99-12Question: In accordance with ASME B16.5-1996, para. 4.14, may flanges NPS12through NPS312meeting all of the requirements for Class 600 be marked to show conformance with bothClass 400 and Class 600?Re
19、ply: Yes.Interpretation: 4-10Subject: Welding End Preparation for Welding Neck FlangesDate Issued: January 31, 2001File: B16-99-14Question: In ASME B16.5-1996, para. 6.7.1, the referenced figures are for attachment of flangesto pipe with wall thickness 0.19 in. and larger. May weld preparations for
20、pipe wall thicknessless than 0.19 in. be used in accordance with para. 6.7.4?Reply: Yes.I-44-11, 4-12, 4-13, 4-14 ASME B16.5-2003Interpretation: 4-11Subject: Socket Weld FlangesDate Issued: January 31, 2001File: B16-00-03Question (1): In ASME B16.5-1996, including 1998 Addenda (a), various tables (f
21、or exampleTable 9) have illustrations that show the location of the applicable tabulated dimensions. Forsocket welding flanges, these illustrations note a limiting flange size range. Are socket-weldingflanges in sizes outside this range, covered by ASME B16.5?Reply (1): No.Question (2): May socket w
22、elding flanges, in sizes greater than NPS 3 (NPS 212for class 1500),which conform to the requirements of ASME B16.5-1996, including 1998 Addenda (a), with alldimensions listed in the applicable tables met, be stamped “B16” in accordance with para. 4.14?Reply (2): No. Socket welding flanges in these
23、larger sizes are not included in the requirementof B16.5.Interpretation: 4-12Subject: Dimensional RequirementsDate Issued: January 31, 2001File: B16-00-004Question: In accordance with ASME B16.5-1996, including 1998 Addenda (a), are there require-ments for the geometry of the shoulder at the circumf
24、erence defined by diameters designated Rin Fig. 7?Reply: No.Interpretation: 4-13Subject: Marking for Welding Neck FlangesDate Issued: January 31, 2001File: B16-00-12Question: Does ASME B16.5-1996 require marking in addition to that described in para. 4 forsocket welding or welding neck flanges?Reply
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