1、STDOASME BLb-34 INT NO* 2-ENGL 0759b70 ObOb753 397 M INTERPRETATIONS TO ASME B16.34 (These interpretations are not part of ASME 816.34-1996 and are included for information only. These interpretations apply to the 1988 and earlier editions and the requirements cited may be different in this Edition.
2、 Therefore, some replies may not be valid in regards to this Edition.) INTRODUCTION As a service to persons who use the B16 standards, B16 Committee renders interpretations of the requirements upon request. The procedure for requesting an interpretation is described in the following paragraphs. The
3、interpretations include all replies which have been approved by the B16 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 s
4、tated in the interpretation. Subsequent revisions to this Standard may supersede the interpretation. PROCEDURE FOR REQUESTING INTERPRETATIONS Upon request, the B16 Committee will render an interpretation of any requirement of this Standard. Interpretations can only be rendered in response to a writt
5、en request, which should be addressed to: Secretary, BI6 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 paragraph
6、 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 include
7、 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 request. ASM
8、E 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 “approve
9、,” “certify,” “rate” or “endorse” any item, construction, proprietary device, or activity. inquirer submit his request using the following format: 119 816.34 Interpretations No. 2 INTERPRETATIONS NO. 2 24,246 Replies to Technical Inquiries Issued from January 1, 1997 Through July 1, 1998 Interpretat
10、ion: 2-45 Subject: Para. 6.7 Date Issued: August 11, 1997 File: B 16-97-002 Question (1): Are multiple radial holes that penetrate the required minimum wall thickness of a valve body, e.g., holes for the purpose of securing an identification plate, permitted under the requirements of para. 6.7(g) of
11、 ASME B16.34-1988? Reply (1): No. This clause only identifies requirements related to a single radial hole. Question (2): Is it permissible to apply the requirements of para. 6.7 of ASME B16.34-1988 to butterfly- type valves that have integral or welded flanges on one or both body ends? Reply (2): N
12、o. Interpretation: 2-46 Subject: Multiple Material Markingndentification Plate Date Issued: April 6, 1998 File: B16-98-005 Question (1): When a valve body material meets all the requirements of two separate material specification grades listed in Table 1 of ASME B16.34-1996, may the valve body be ma
13、rked with both material grade symbols in accordance with para. 4.2.8? Reply (1): Yes. Question (2): Is the selection of which of the two maximum or limiting temperatures to be shown on the identification plate required by para. 4.3 of ASME B16.34-1996 for a valve body that is marked with two materia
14、l grade symbols designating material grades that have differing cautionary or specified temperature limits listed in the respective Table 2 Notes the option of the manufacturer? Reply (2): Yes. 139 247 STD-ASME BLb.34 INT NO- 2-ENGL 0759b70 ObOb755 LbT D 816.34 Interpretations No. 2 Interpretation:
15、2-47 Subject: Minimum Wall Thickness Date Issued: April 6, 1998 File: B 16-98-006 Question (1): Do the rules of para. 6.1.6 in ASME B16.34-1996 apply to local areas having less than the required minimum wall thickness resulting from manufacturing operations such as casting, forging, and machining, i
16、ncluding grinding, milling, and drilling? Reply (1): Yes. Question (2): Under the rules of ASME B16.34-1988, is it permissible to use Table 3 to extrapolate minimum wall thickness for valves having pressure-temperature ratings less than Class 150? Reply (2): No. Question (3): Are flanged valves that
17、 conform to the flange thickness requirements for PN 10 steel valves within the scope of either ASME B16.34-1988 or -1996? Reply (3): No. INTERPRETATIONS TO ASME B16.34 (These interpretations are not part of ASME 816.34-1996 and are included for information only. These interpretations apply to the 1
18、988 and earlier editions and the requirements cited may be different in the current edition. Therefore, some replies may not be valid in regards to this Edition. The effective date of this Edition is as noted in the forward.) INTRODUCTION As a service to persons who use the B16 standards, B16 Commit
19、tee renders interpretations of the requirements upon request. The procedure for requesting an interpretation is described in the following paragraphs. The interpretations include all replies which have been approved in response to inquiries concerning interpretation of this Standard since the public
20、ation of ASMWANSI B16.34-1988. 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
21、 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 written request, which should be addressed to: Secretary, B16 Main Committee The American Society of Mechanical Engineers United Eng
22、ineering Center 345 East 47th Street New York, NY 10017 The request for interpretation should be clear and unambiguous. It is further recommended that the (a) Subject, Cite the applicable paragraph number(s) andor give a concise description of the subject. (b) Question. Phrase the question as a requ
23、est 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 include any plans or drawings which are necessary to explain the question; however, they should not contain pro
24、prietary 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 request. ASME procedures provide for reconsideration of an interpretation when or if additional information is avail
25、able 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 “approve,” “certify,” “rate,” or “endorse” any item, construction, proprietary device, or activity. inquirer sub
26、mit his request using the following format: 119 INTERPRETATIONS NO. 2 Replies to Technical Inquiries Issued from January 1, 1990 Through December 31, 1995 Interpretation: 2-1 Subject: Table 1; Materials Date Issued: May 17, 1990 File: B 16-89-O0 1 Question (1): Is there an error in Table 1 in that A
27、STM A 351-CG8M is not listed? Reply (I): No. Question (2): Does a valve with a valve body made of ASTM A 351-CG8M comply with the requirements of ASMElANSI B 16.34-1988? Reply (2): No. Question (3): Can new materials be added to Table l? Reply (3): Yes. This can be done at the next revision or when
28、an Addenda is prepared. In order to facilitate the inclusion of new materials, it is recommended that the requester provide the Committee with the data needed to establish pressure-temperature ratings as provided in Annex F. Interpretation: 2-2 Subject: Paragraph 8.4.2; Weld Repair Date Issued: May
29、29, 1989 File: B 16-89-002 Question: Does B16.34 set limits on the extent of weld repair that may be performed on castings for Standard Class, Special Class or Limited Class valves? Reply: No 121 2-3, 2-4, 2-5 816.34 Interpretations No. 2 Interpretation: 2-3 Subject: Paragraph 8.3.2.2; Surface Exami
30、nation Date Issued: May 30, 1990 File: B 16-89-003 Question: Under ASMWANSI B16.34-1988, para. 8.3.2.2, is it permissible, for Special Class valves, to perform any or all of the required surface examinations either prior to or after machining? Reply: Yes, provided that the required examinations take
31、 place, as required by para. 8.2, after any required heat treatment. Interpretation: 2-4 Subject: Paragraph 6.1.5, Tables 3 and G3, Annexes A and G Date Issued: May 21, 1990 File: B 16-89-004 Question (1): Minimum wall thickness requirements are defined in ANSI B 16.34-1981, para. 6.1.5 for the zone
32、 1.33t, from the weld end and for the zone tm from the body neck. The intervening transition zone is required to be gradual. Is it required that the transition taper be external? Reply (1): No, a transition, if used, may be either external or internal or a combination of both. Question (2): In ANSI
33、B16.34-1981, the minimum wall thickness tabulated for Class 4500 and 15 in. diameter is 11.64 in. and 295.7 mm. Are these tabular numbers correct? Reply (2): No. This is a misprint that has been corrected in ASMWANSI B16.34-1988. The correct value is 11.87 in. Metric dimensions are no longer used in
34、 B16.34. Question (3): In ANSI B 16.34-1981, is it a requirement that valve seat diameters be equal to (or pater than) the inside diameters of Annex A? Reply (3): No. There are, however, user specifications that require “full port” valves and reference Annex A as the definition for full port. Interp
35、retation: 2-5 Subject: Paragraph 8.3.2.1; Ultrasonic or Radiographic Examination Date Issued: May 29, 1989 File: B 16-89-O05 Question: Is it intended that the distance of coverage for the Special Class Examination for forgings under para. 8.3.2.1 be the same as for castings? Reply: No. It is a requi
36、rement of paras. 8.3.2.1(a) and (b) that the entire cylindrical and ring sections be examined. 122 STD.ASME BLb.31.I INT-ENGL m 0759b70 0579bAb 200 m 816.34 Interpretations No. 2 2-6, 2.7, 58 Interpretation: 2-6 Subject: Paragraph 2.3.3; Fluid Thermal Expansion Date Issued: October 5, 1989 File: B 1
37、6-89-009 Question: If a pressure relief valve is used as the means of overpressure protection under para. 2.3.3 of ASMEVANSI B16.34-1988, is it required that the relief valve be manufactured and tested in accordance with one of the Sections of the ASME Boiler and Pressure Vessel Code, by a manufactu
38、rer holding the applicable Code Certificates? Reply: This would depend upon the requirements of the purchaser of the B16.34 valve. Paragraph 2.3.3 assigns responsibility for providing means to assure that the pressure in the valve will not exceed that allowed to the purchaser. If the purchaser choos
39、es a pressure relief valve as the means then it is also the purchasers responsibility to designate which codes or regulation, if any, apply to the installed valve and concomitantly to the pressure relief valve, see para. 1.2.2. Interpretation: 2-7 Subject: Paragraph 2.1.3; Limited Class Valves Date
40、Issued: April 9, 1990 File: B 16-89-0 1 1 Question (1): Does the expression “welding end” in ASMWANSI B16.34-1988, para. 1.1 apply to both socket welding and butt welding end valves? Reply (1): Yes. Question (2): May butt welding end valves, size NPS 2-92 and smaller be constructed in accordance wit
41、h Annex G of .ASMUANSI B16.34-1988? Reply (2): Yes. Interpretation: 2-8 Subject: Seal Welding Date Issued: April 9, 1990 File: B16-90-001 Question: Does ASMWANSI B16.34-1988 include fabrication requirements for seal welding of seat rings into valve bodies? Reply: No. 123 2-9, 2-10, 2-11 B16.34 Inter
42、pretations No. 2 Interpretation: 2-9 Subject: Paragraph 6.1.3; Valve Body Necks Date Issued: May 4, 1990 File: B 16-90-07 Question: Does para. 6.1.3 of ASMWANSI B 16.34-1988 prohibit a gate valve design using a rectangular body neck? Reply: No, however, para. 6.1.7 requires that the manufacturer det
43、ermine if additional metal is needed for shapes other than circular. Interpretation: 2-10 Subject: Paragraph 6.1.2; Inside Diameter Date Issued: June 11, 1990 File: B 16-90-0 15 Question: With reference to ANSI B16.34-1981, para. 6.1.2, for butt welding end valves, may the “basic inside diameter at
44、the valve end” be taken as the inside diameter of the highest pipe Schedule Number applicable to the valve size and pressure class? Reply: No. The basic inside diameter is a valve specific dimension that may or may not be relevant to a particular set of pipe dimensions. Interpretation: 2-1 1 Subject
45、: Paragraph 2.1.5 (c); Valves Fabricated by Welding Date Issued: October 31, 1990 File: B 16-90-020 Question: Does ASMWANSI B16.34-1988 require nondestructive examination for Standard Class Valves, NPS 6 and smaller, that are fabricated by welding? Reply: No. 124 STD-ASME BLb-34 INT-ENGL m 0757b70 0
46、579b88 083 m 816.34 Interpretations No. 2 2-12, 2-13 Interpretation: 2-12 Subject: Paragraph 8.4; Defect Removal and Repair Date Issued: January 21, 1991 File: B 16-90-030 Question (1): In ASMUANSI B16.34-1988, is Clause 8.4, covering defect removal and repair, a requirement only for Special Class v
47、alves? Reply (1): Yes. Question (2): Where are the requirements for defect removal, repair, and post weld heat treatment for other than Special Class valves? Reply (2): The requirements are those stipulated in the respective ASTM specifications as covered in Table 1. Question (3): When a valve is us
48、ed in conjunction with an ASME Code for Pressure Piping and is designated as a Special Class valve and is so marked on the valve identification plate, is it required that the post weld heat treatment provisions of para. 8.4.2(c) be met? Reply (3): Yes. For limitations imposed by codes and regulation
49、s, see para. 1.2.2. Interpretation: 2-13 Subject: Annex F; Special Class Rating Method Date Issued: January 21, 1991 File: B 16-90-034 Question: Does Annex F, Special Class Rating Method, ANSI B 16.34-1981, include requirements for determining hydrostatic shell test pressure? Reply: No. The purpose of Annex F, see F1 .l, is to record the rules that were used to determine the tabulated pressure-temperature ratings. The only pressure-temperature ratings recognized for Special Class valves are those in Table 2. The required hydrostatic shell test pressure, for all valves, is as described
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