ANSI ASME B16.34 INTERPRETATIONS-1998 Interpretations to B16.34-1996 Valves - Flanged Threaded and Welding End (Includes Interpretation No 2).pdf

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1、 STDASME 816.34 !NT NO. 2-ENGL II 0759670 0606953 397 II INTERPRETATIONS TO ASME 816.34 (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 Edit

2、ion. Therefore, some replies may not be valid in regards to this Edition.) INTRODUCTION As a service to persons who use the Bl6 standards, Bl6 Committee renders interpretations of the requirements upon request. The procedure for requesting an interpretation is described in the following paragraphs.

3、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 Adde

4、nda stated in the interpretation. Subsequent revisions to this Standard may supersede the interpretation. PROCEDURE FOR REQUESTING INTERPRETATIONS Upon request, the B 16 Committee will render an interpretation of any requirement of this Standard. Interpretations can only be rendered in response to a

5、 written request, which should be addressed to: Secretary, B 16 Main Committee The American Society of Mechanical Engineers Three Park A venue New York, NY 10016-5990 The request for interpretation should be clear and unambiguous. It is further recommended that the inquirer submit his request using

6、the following format: (a) Subject. Cite the applicable paragraph 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

7、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 proprietary names or information. Requests which are not in this format may be rewritten in this format prior to being answered, which

8、may inadvertently change the original intent of the request. 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

9、cognizant ASME committee or subcommittee. ASME does not “approve,“ “certify,“ “rate“ or “endorse“ any item, construction, proprietary device, or activity. 119 (a) STD.ASME 816.34 INT NO 2-ENGL 0759670 0606954 223 816.34 Interpretations No. 2 2-45, 2-46 INTERPRETATIONS NO.2 Replies to Technical Inqui

10、ries Issued from January 1, 1997 Through July 1, 1998 Interpretation: 2-45 Subject: Date Issued: File: Para. 6.7 August 11, 1997 B16-97-002 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 identifi

11、cation plate, permitted under the requirements of para. 6.7(g) of ASME BI6.34-1988? Reply (I): 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 B 16.34-1988 to butterfly type valves that have

12、 integral or welded flanges on one or both body ends? Reply (2): No. Interpretation: 2-46 Subject: Date Issued: File: Multiple Material Marking/Identification Plate April 6, 1998 B16-98-005 Question (I): When a valve body material meets all the requirements of two separate material specification gra

13、des listed in Table 1 of ASME Bl6.34-1996, may the valve body be marked 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 o

14、f ASME Bl6.34-1996 for a valve body that is marked with two material 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 STD.ASME 816-34 !NT NO 2-ENGL 07596

15、70 0606955 16T 2-47 Interpretation: 2-47 Subject: Date Issued: File: Minimum Wall Thickness April 6, 1998 B16-98-006 816.34 Interpretations No. 2 Question (1): Do the rules of para. 6.1.6 in ASME 816.34-1996 apply to local areas having less than the required minimum wall thickness resulting from man

16、ufacturing operations such as casting, forging, and machining, including grinding, milling, and drilling? Reply (l): Yes. Question (2): Under the rules of ASME 816.34-1988, is it permissible to use Table 3 to extrapolate minimum wall thickness for valves having pressure-temperature ratings less than

17、 Class 150? Reply (2): No. Question 3): Are flanged valves that conform to the flange thickness requirements for PN 10 steel valves within the scope of either ASME B 16.34-1988 or -1996? Reply (3): No. 140 STD.ASME 816.34 INT-ENGL II 0759670 0579683 5T1 II INTERPRETATIONS TO ASME 816.34 (These inter

18、pretations 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 the current edition. Therefore, some replies may not be valid in regards to this Edition. The effective date

19、of this Edition is as noted in the forward.) INTRODUCTION As a service to persons who use the B 16 standards, B 16 Committee renders interpretations of the requirements upon request. The procedure for requesting an interpretation is described in the following paragraphs. The interpretations include

20、all replies which have been approved in response to inquiries concerning interpretation of this Standard since the publication of ASMEIANSI 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 stat

21、ed in the interpretation. Subsequent revisions to this Standard may supersede the interpretation. PROCEDURE FOR REQUESTING INTERPRETATIONS On request, the B 16 Committee will render an interpretation of any requirement of this Standard. Interpretations can only be rendered in response to a written r

22、equest, which should be addressed to: Secretary, B16 Main Committee The American Society of Mechanical Engineers United Engineering Center 345 East 47th Street New York, NY 10017 The request for interpretation should be clear and unambiguous. It is further recommended that the inquirer submit his re

23、quest using the following format: (a) Subject. Cite the applicable paragraph 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

24、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 proprietary names or information. Requests which are not in this format may be rewritten in this format prior to being answ

25、ered, which may inadvertently change the original intent of the request. 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 ap

26、peal to the cognizant ASME committee or subcommittee. ASME does not “approve,“ “certify,“ “rate,“ or “endorse“ any item, construction, proprietary device, or activity. 19 STD.ASME 816.34 INT-ENGL 0759670 0579684 438 816.34 Interpretations No. 2 21, 2-2 INTERPRETATIONS NO.2 Replies to Technical Inqui

27、ries Issued from January 1, 1990 Through December 31, 1995 Interpretation: 21 Subject: Date Issued: File: Table 1; Materials May 17, 1990 B16-89-001 Question (1): Is there an error in Table 1 in that ASTM A 351-CGSM is not listed? Reply (1 ): No. Question (2): Does a valve with a valve body made of

28、ASTM A 351-CGSM comply with the requirements of ASMFJ ANSI B 16.34-19881 Reply (2): No. Question (3): Can new materials be added to Table 11 Reply (3): Yes. This can be done at the next revision or when an Addenda is prepared. In order to facilitate the incJusion of new materials, it is recommended

29、that the requester provide the Committee with the data needed to establish pressure-temperature ratings as provided in Annex F. Interpretation: 22 Subject: Date Issued: File: Paragraph 8.4.2; Weld Repair May 29, 1989 B16-89-002 Question: Does B 16.34 set limits on the extent of weld repair that may

30、be performed on castings for Standard Class, Special Class or Limited Class valves? Reply: No 121 STD-ASME 816.34 INT-ENGL II 0759670 0579685 374 II 2-3, 2-4, 2-5 Interpretation: 23 Subject: Date Issued: File: Paragraph 8.3.2.2; Surface Examination May 30, 1990 B16-89-003 816.34 Interpretations No.

31、2 Question: Under ASMFJANSI 816.34-1988, para. 8.3.2.2, is it pennissib1e, for Special Class valves, to perfonn any or all of the required surface examinations either prior to or after machining? Reply: Yes, provided that the required examinations take place, as required by para. 8.2, after any requ

32、ired heat treatment. Interpretation: 2-4 Subject: Date Issued: File: Paragraph 6.1.5, Tables 3 and 03, Annexes A and G May 21, 1990 B16-89-004 Question (1): Minimum wall thickness requirements are defined in ANSI 816.34-1981, para. 6.1.5 for the zone 1.33tm from the weld end and for the zone tm from

33、 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 816.34-1981, the minimum wall thickness tabulated

34、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 ASMFJANSI 816.34-1988. The correct value is 11.87 in. Metric dimensions are no longer used in B 16.34. Question (3): In ANSI 816.34-1981, is i

35、t a requirement that valve seat diameters be equal to (or greater 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. Interpretation: 2-5 Subject: Date Issued: File: Parag

36、raph 8.3 .2.1 ; Ultrasonic or Radiographic Examination May 29, 1989 B16-89-005 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 requirement of paras. 8.3.2.1(a) and (b) that the e

37、ntire cylindrical and ring sections be examined. 122 STD.ASME 816.34 INT-ENGL 0759670 0579686 200 B 16.34 Interpretations No. 2 Interpretation: 26 Subject: Date Issued: File: Paragraph 2.3.3; Fluid Thermal Expansion October 5, 1989 B16-89-009 Z-8, Z-7, 2.8 Question: If a pressure relief valve is use

38、d as the means of overpressure protection under para. 2.3.3 of ASMFJANSI Bl6.34-1988, 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 manufacturer holding the applicable Code Certificates? Reply:

39、 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 chooses a pressure relief valve as the means then it is a

40、lso 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: 27 Subject: Paragraph 2.1.3; Limited Class Valves Date Issued: File: April 9, 1990 Bl6-89-0ll Question (1):

41、Does the expression “welding end“ in ASMEJANSI 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-Y2 and smaller be constructed in accordance with Annex G of ASMEJANSI Bl6.34-1988? Reply (2): Yes. Int

42、erpretation: 2-8 Subject: Date Issued: File: Seal Welding April 9, 1990 B16-90-001 Question: Does ASMEIANSI Bl6.34-1988 include fabrication requirements for seal welding of seat rings into valve bodies? Reply: No. 123 STD-ASME 816.34 INT-ENGL 0759670 0579687 147 29, 2-10, 211 Interpretation: 2-9 Sub

43、ject: Date Issued: File: Paragraph 6.1.3; Valve Body Necks May 4, 1990 Bl6-90-07 816.34 Interpretations No. 2 Question: Does para. 6.1.3 of ASME/ANSI Bl6.34-1988 prohibit a gate valve design using a rectangular body neck? Reply: No, however, para. 6.1.7 requires that the manufacturer determine if ad

44、ditional metal is needed for shapes other than circular. Interpretation: 21 0 Subject: Date Issued: File: Paragraph 6.1.2; Inside Diameter June 11, 1990 B16-90-015 Question: With reference to ANSI B 16.34-1981, para. 6.1.2, for butt welding end valves, may the “basic inside diameter at the valve end

45、“ 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: 2-11 Subject: Date Issued:

46、 File: Paragraph 2.1.5 (c); Valves Fabricated by Welding October 31, 1990 Bl6-90-020 Question: Does ASME/ANSI B 16.34-1988 require nondestructive examination for Standard Class Valves, NPS 6 and smaller, that are fabricated by welding? Reply: No. 124 STD.ASME 816-34 INT-ENGL II 0759670 0579688 083 I

47、I 816.34 Interpretations No. 2 Interpretation: 212 Subject: Date Issued: File: Paragraph 8.4; Defect Removal and Repair January 21, 1991 Bl6-90-030 2-12. 2-13 Question (1): In ASMEIANSI B 16.34-1988, is Clause 8.4, covering defect removal and repair, a requirement only for Special Class valves? Repl

48、y (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 used in conju

49、nction 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 regulations, see para. 1.2.2. Interpretation: 213 Subject: Date Issued: File: Annex F; Special Class Rating Method January 21, 1991 Bl6-90-034 Question: Does Annex F, Special Class Rating Method, ANSI B 16.34-1981, include requirements for determining hydrostatic shell test pres