7/30/2019 ASME B31.1 (Interpretação Nº 25) http://slidepdf.com/reader/full/asme-b311-interpretacao-no-25 1/11 INTERPRETATIONS NO. 25 Replies to Technical Inquiries January 1, 1994, Through June 30, 1994 It has been agreed to publish interpretations issued by the B31 Committee concerning B31.1 as part of the update service to the Code. The interpretations have been assigned numbers in chronological order. Each interpretation applies either to the latest Edition or Addenda at the time of issuance of the interpretation or the Edition or Addenda stated in the reply. Subsequent revisions to the Code may have superseded the reply. These interpretations are not a part of the Code or the 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. In the case where an interpretation is corrected by Errata, the original interpretation number with the suffix E is used. 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 Policy in the Code documents, ASME does not "approve," "certify," "rate," or "endorse" any item, construction, proprietary device, or activity. The interpretations will be issued twice a year up to the publication of the 1995 Edition. Interpretations Nos. 2 through 7 were included with the update service to the 1983 Edition and Interpretations Nos. 8 through 13 were included with the update service to the 1986 Edition. Interpretations Nos. 14 through 19 were included with the update service to the 1989 Edition. Interpretations Nos. 20 through 25 will be included with the update service to the 1992 Edition.
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It has been agreed to publish interpretations issued by the B31 Committee concerning B31.1
as part of the update service to the Code. The interpretations have been assigned numbers in
chronological order. Each interpretation applies either to the latest Edition or Addenda at the time
of issuance of the interpretation or the Edition or Addenda stated in the reply. Subsequent revisionsto the Code may have superseded the reply. These inter pretations are not a part of the Code or the
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. In the case where an
interpretation is corrected by Errata, the original interpretation number with the suffix E is used.
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 Policy in the Code documents, ASME does not "approve," "certify,"
"rate," or "endorse" any item, construction, proprietary device, or activity.
The interpretations will be issued twice a year up to the publication of the 1995 Edition.
Interpretations Nos. 2 through 7 were included with the update service to the 1983 Edition and
Interpretations Nos. 8 through 13 were included with the update service to the 1986 Edition.
Interpretations Nos. 14 through 19 were included with the update service to the 1989 Edition.
Interpretations Nos. 20 through 25 will be included with the update service to the 1992Edition.
Question (1): When not specified by the designer, is it permissible to fabricate a weld which
partially fills the groove between pipe, between fittings, or between pipe and a fitting so long as the
minimum wall thickness requirement of Para. 104.1.2 is met and a transition between the weld
surface and the pipe or fitting surface is provided in accordance with Para. 127.4.2(C)?
Reply (1): No.
Question (2): When specified by the designer, is it permissible to fabricate a weld which partially
fills the groove between pipe, between fittings, or between pipe and a fitting so long as the minimum
wall thickness requirement of Para. 104.1.2 is met and a transition between the weld surface and
the pipe or fitting surface is provided in accordance with Para. 127.4.2(C)?
Reply (2): Yes.
Interpretation: 25-2
Subject: B31.1, 102.2.4, Variation from Normal Operation
Date Issued: March 15, 1994
File: B3 1-92-068
Question: When considering variations from normal thermal operating cycles, can the right sideterm of Eq. (13A), Para. 104.8.3, be multiplied by the 1.15 or 1.20 values contained in Para. 102.2.4?
Reply: No. The increases in allowable stresses for pressure design permitted by Para. 102.3.2(A)
and for occasional loads permitted by Para. 102.3.3(A), are not permitted in the evaluation of cyclic
stress ranges. Paragraph 102.2.4 provides limitations for pressure stress magnitudes, whereas the
right hand side of Eq. (13) is a limitation for cyclic thermal expansion stress ranges.
Interpretation: 25-3
Subject: B31.1, 104.3.1, Branch Connections
Date Issued: March 15, 1994
File: B31-92-071
Question: In accordance with Para. 104.3.1(C.l), does a tee manufactured to ANSI B16.9 meet
the pressure requirements of ASME B31.1, as far as reinforcement in the crotch is concerned?
Reply: Yes. However, further consideration may be necessary for other loadings.
Subjec t: B31.1, Pa ra. 137.3.2, Testing of Non boiler External Piping
Da te Issued: March 15, 1994
B31.1 Interpretations No. 25
File: B31-93-038
Question (1): For piping used with a h ot water bo iler designed for 150 psig a nd 210°F, are thetest requ iremen ts of P ara. 137.3.2 applicable?
Reply (1): Yes.
Question (2): For the above referenced piping, are full penetration welds required?
Reply (2): Yes, except for welds designed in accordance w ith P ara. 104.3.1(C.2) and fabricatedin accordance with Para. 127.4.8(F).
Interpretat ion: 25-10
Subjec t: B31.1, 136.4.2, Visual Inspection
Da te Issued: March 15, 1994
File: B31-93-047
Question: Do es ASM E B31.1 set an accep table limit for acceptance of surface porosity foundby visual examination?
Reply: No.
Interpretat ion: 25-1 1
Subjec t: B31.1-1967, 127.4.2 (D)
Da te Issued: March 15, 1994
File: B31-93-48
Question: Does the reinforcement requirements detailed in USAS B31.1-1967 Edition, Para.127.4.2(D), apply to the root reinforcement of single V butt weld p ipe joints?
Subject: B31.1, 137.3.2 and 137.7.1, Hydrostatic Test
Date Issued: April 22, 1994
File: B31-93-043
Question (1): Does ASME B31.1 define the term "not practical" in Para. 137.7.1?
Reply (1): No. It is the responsibility of the owner to determine which test shall be done on
NBEP. See Para. 137.3.2
Question (2): Does ASME B31.1 exempt piping, valves, and fittings NPS 1 inch and less from
hydrostatic test requirements?
Reply (2): No.
Interpretation: 25-13
Subject: B31.1, 100.1.3(C), Design Pressure
Date Issued: April 29, 1994
File: B31-92-067
Question: What rules of ASME B31.1 apply to the design pressure of piping downstream of a
pressure reducing valve?
Reply: The design pressure of piping downstream of a pressure reducing valve shall be deter-
mined in accordance with the rules of Para. 101.2.2. Where the design pressure is less than that ofthe piping upstream of the pressure reducing valve, the requirements of Para. 122.5 shall be met.
Interpretation: 25-14
Subject: B31.1, 122.7.3(B), Piping for Flammable Liquids
Date Issued: June 22, 1994
File: B31-92-036
Question (1): For flammable and combustible liquids, does ASME B31.1, Para. 122.7.3(B),
permit the use of copper tubing, where metal temperatures do not exceed 400°F, to match thecopper alloy fittings permitted in this paragraph?
Reply (1): No. The allowance applies only to copper alloy valves and fittings.
Question (2): Does Para. 122.7.3(C) permit copper tube and copper alloy valves and fittings in
areas having metal temperatures between 400°F and 500°F?
Subject: B31.1, Table 132, Postweld H eat Tre atme nt
Date Issued: June 22, 1994
File: B3 1-94-027
Question: I s th e "nominal thickness in accordance with Para. 132.4.1" the sam e as the "nominalmaterial thickness," m entioned in Notes (I)(B) for P-Nos. 1 and 3 in Table 132?
Reply: No. Th e "nominal thickness in accordance with Par a. 132.4.1" may be th e weld thickness
under some specified conditions but the "nominal material thickness" is always the material thick-