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
25、: No.Interpretation: 4-14Subject: Material ConformanceDate Issued: February 1, 2002File: B16-C-01-01Question: In accordance with ASME B16.5-1996 Edition, 1998 Addenda (a), may flanges manu-factured of materials other than those listed in Table 1A be marked as being in conformance withASME B16.5 as r
26、equired by para. 4.14?Reply: No. See para. 5.1.I-5ASME B16.5-2003 4-15, 4-16, 4-17Interpretation: 4-15Subject: Lapped Joint Flanges ThicknessDate Issued: February 1, 2002File: B16-C-01-02Question: What minimum thickness does ASME B16.5-1996, 1998 Addenda (a), require forlapped joint flanges?Reply: D
27、imension “C” as shown in Tables 9, 12, 15, 18, 21, 24, and 27. See para. 7.4 for tolerance.Interpretation: 4-16Subject: Marking RequirementsDate Issued: February 20, 2002File: B16-C-01-03Question (1): According to B16.5-1996, 1998 Addenda (a), is it required that the designation“B16” or the designat
28、ion “B16.5” be marked on the flange?Reply (1): It is required that “B16” be marked on the flange. See para. 4.1.4.Question (2): Does marking “B16.5” in lieu of “B16”, as required, render the flange nonconform-ing to ASME B16.5-1996, 1998 Addenda (a)?Reply (2): No.Interpretation: 4-17Subject: Flange
29、ThicknessDate Issued: September 2, 2002File: 02-02830Question: According to ASME B16.5-1996 edition, 1998 Addenda (a), is it acceptable for theflange thickness to taper to the edge and be thinner than the flange thickness “C” dimensionlisted in the dimensional tables?Reply: No. See para. 7, Toleranc
30、es.I-6STD-ASME Blb.5 INT NO. 3-ENGL E 0757b70 0b08539 178 INTERPRETATIONS TO ASME B16.5 (These interpretations are not part of ASME 816.5-1996 and are included for information only. These interpretations apply to the 1988 and earlier editions and the requirements cited may be different in this Editi
31、on. Therefore, some replies may not be valid in regards to this Edition.) INTRODUCTION As a service to persons who use the B16 standards, the B16 Committee renders interpretations of the requirements upon request. The procedure for requesting an interpretation is described in the following paragraph
32、s. The interpretations include all replies which have been approved by the B 16 Main Committee in response to inquiries concerning interpretation of this Standard. An interpretation applies either to the Edition and Addenda in effect on the date of issuance of the interpretation or the Edition and A
33、ddenda stated in the interpretation. Subsequent revisions to this Standard may supersede the interpretation. PROCEDURE FOR REQUESTING INTERPRETATIONS On request, the B16 Committee will render an interpretation of any requirement of this Standard. Interpretations can only be rendered in response to a
34、 written request, which should be addressed to: Secretary, B 16 Main Committee The American Society of Mechanical Engineers Three Park Avenue New York, NY 10016-5990 The request for interpretation should be clear and unambiguous. It is further recommended that the (a) Subject. Cite the applicable pa
35、ragraph number(s) and/or give a concise description of the subject. (b) Question. Phrase the question as a request for an interpretation of a specific requirement suitable for general understanding and use, not as a request for an approval of a proprietary design or situation. The inquirer may also
36、include any plans or drawings which are necessary to explain the question; however, they should not contain proprietary names or information. Requests which are not in this format may be rewritten in this format prior to being answered, which may inadvertently change the original intent of the reque
37、st. ASME procedures provide for reconsideration of an interpretation 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. ASME does not “
38、approve,” “certify,” “rate,” or “endorse” any item, construction, proprietary device, or activity. inquirer submit his request using the following format: 153 STD-ASME BLb.5 INT NO- 3-ENGL W 0759b70 Ob08540 77T W 816.5 Interpretations No. 3 3-1,3-2 INTERPRETATIONS NO. 3 Replies to Technical Inquirie
39、s Issued from January 1, 1996 Through December 31, 1997 Interpretation: 3-1 Subject: Class Designation and Surface Finish Date Issued: March 5, 1997 File: B 16-96-0 15 Question (1): According to ASME B16.5-1988, what is the correlation between the Class designation and the allowable working pressure
40、 at 100“F? Reply (1): See Annex D. Question (2): According to ASME B16.5-1988, does the resultant surface finish refer to the average finish over the raised face, or does it refer to the finish at the bottom of the grooves formed by the cutting tool? Reply (2): It refers to the average finish. Inter
41、pretation: 3-2 Subject: Tolerances Date Issued: March 27, 1997 File: B 16-96-0 14 Question: In B16.5-1988 or B16.5a-1992, is there a tolerance on the radius, r, for lap-joint flanges? Reply: No. 173 STDmASME BLb.5 INT NO. 3-ENGL I 0757b70 Ob08541 82b E 3-3, 3-4. 3-5 816.5 Interpretations No. 3 Inter
42、pretation: 3-3 Subject: Hub Dimensions of Reducing Flanges Date Issued: March 27, 1997 File: B 16-96-0 1 1 Question (1): According to B16.5-1988, what are the minimum hub dimensions of a NPS 6 X 2% Class 300 slip-on reducing flange? Reply: The minimum dimensions are the same as those for NPS 2% Clas
43、s 300 slip-on flanges. See Note (1) of Table 7. Interpretation: 3-4 Subject: Removal of Raised Face from a Flange Date Issued: May 23, 1997 File: B 16-97-003 Question: According to ASME B16.5-1988, is it acceptable to supply a flat faced flanged or flanged fitting made from a Class 150 or a Class 30
44、0 raised face flange or flanged fitting with the raised face removed, even if the resulting thickness is 0.06 in. less than the minimum shown in the Tables? Reply: Yes. See para. 6.3. Interpretation: 3-5 Subject: Machining of a Slip-On Flange Date Issued: May 28, 1997 File: B 16-97-0 1 O d flange Qu
45、estion: Does ASME B16.5-1996 permit the manufacturer of a Class 150 or 300 lappe by machining it from a slip-on flange? Reply: Yes, provided the resulting flange meets the requirements for a lapped flange, including flange thickness, bore, and length through the hub dimensions shown in Tables 9 and
46、12. Since a lapped flange does not have a raised face, the raised face removal discussed in para. 6.1.3 does not apply * 174 816.5 Interpretations No. 3 Interpretation: 3-6 Subject: Use of O-Ring Seals Date Issued: July 10, 1997 File: B 16-96-004 Question : Is the use of O-ring seals with flanged jo
47、ints prohibited by the rules of ASME B16.5- 1988? 3-6 Reply: No. See para. E2 of Annex E. 175 STD.ASflE Blb.5 INT-ENGL 0759b70 0579543 T3Y INTERPRETATIONS TO B16.5 (These interpretations are not part of ASME 816.5-1996 and are included for information only. These interpretations apply to the 1988 an
48、d earlier editions and the requirements cited may be different in this Edition. Therefore, some replies may not be valid in regards to this Edition.) INTRODUCTION As a service to persons who use the B16 standards, the B16 Committee renders interpretations of the requirements upon request. The proced
49、ure for requesting an interpretation is described in the following paragraphs. The interpretations include all replies which have been approved by the B 16 Main Committee in response to inquiries concerning interpretation of this Standard. An interpretation applies either to the Edition and Addenda in effect on the date of issuance of the interpretation or the Edition and Addenda stated in the interpretation. Subsequent revisions to this Standard may supersede the interpretation. PROCEDURE FOR REQUESTING INTERPRETATIONS On request, the B16 Committee will render an interpretation of any req
