asme b31.1 (interpretação nº 21)

7/30/2019 ASME B31.1 (Interpretação Nº 21)

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INTERPRETATIONS NO. 21Replies to Technical Inquiries

January 1, 1 99 2, ~ h r o u g h un e 30, 1992

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 timeof 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to the Code may have superseded the reply.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.



Subject Interpreta tion File

104.1.Pressure Design of Components ............................................... 21-4 B31-91-045

114.1 and 114.2.3.Threaded Insertion m e low Sensors............................... 21-7

121.Design of Pipe Supporting Elements............................................. 21-5 B31-91-030

121.7.Supporting Structures; 100.1.2.Jurisdictional Limits .............................. 21-6 B31-91-049

122.8.2.Piping for Toxic Fluids...................................................... 21-3 B31-90-066

Piping C onnecting Pieces of Mechanical Equipment ................................... 21-2 B31-88-016

Scope of Application to Pulp and Paper Mills......................................... 21-1 B31-90-67A



831.1 Interpretations No. 21

Interpretation: 21-1

Subject: B31.1, Scope of Application to Pulp and Paper Mills

Date Issued: February 7, 1992

File: B31-90-67A

Question: Which ASME B31 Code is applicable to piping systems designed for the collection

and conveying of toxic noncondensible gases in pulp and paper mills?

Reply: The applicable Code for such a system depends upon its purpose. If the toxic gases are

used as part of a chemical process, 31.3 applies. If they are used as a working fluid or as part of

a power generation loop, B31.1 applies. If the piping is clearly not in the scope of either of these

B31 Codes, the tenth paragraph of the Introduction to B31.1 permits the user to select any B31

Code Section determined to be generally applicable.


Subject: B31.1, Piping Connecting Pieces of Mechanical Equipment

Date Issued: February 21, 1992

File: B31-88-016

Question: Does B31.1 apply to piping used to transfer steam from the exhaust connection of

an intermediate pressure turbine to the inlet connection of a low pressure turbine? The piping is

84 in. in diameter, 260 ft long with design conditions of 128 psig and 636OF.

Reply: Yes.

Note: This interpretation is intended only to apply to a specific instance; the issue of general

applicability is under consideration by the B31 Committee.



831.1 Interpretations No . 21


Subject: B31.1, 122.8.2, Piping for Toxic Fluids

Date Issued: March 19, 1992

File: B31-90-066

Question (1): Does the wall thickness requirements of Para. 122.8.2(B) apply to nonsteel pipingmaterials?

Reply (1): No; however, the requirements of Para. 104.1.2 shall be met.

Question (2):(a) Does Para. 122.8.2(C) apply to piping connections at metering pumps?(b) Are metering pumps considered to be associated with a container?

Reply (2):(a) Yes.

@) No.

Interpretation: 21 4

Subject: B31.1, 104.1, Pressure Design of Components

Date Issued: March 19, 1992

File: B31-91-045

Question: Is it the intent of ASME B31.1 that if the actual tensile strength of the material isgreater than the minimum tensile strength identified in Appendix A, a proportionately greater value

for SE may be used in the "Design Pressure Calculation of Para. 104.1"?

Reply: No.





Subject: B31.1, 121, Design of Pipe Supporting Elements

Date Issued: June 17, 1992

File: B31-91-030

Question (1): Do Para. 121 requirements apply only to the design and manufacture of "standard

types of pipe hanger components" as defined in MSS SP-58 ?

Reply (1): No.

Question (2): Does Para. 121.2 allow the use of stress values other than those given in MSS

SP-58 or Appendix A.

Reply (2): Yes, see Paras. 121.2(B) and (C).


Subject: B31.1, 121.7, Supporting Structures; 100.1.2, Jurisdictional Limits


File: B31-91-049

Question (1): Is the structure which resists the piping loads transmitted through pipe hangers

and supports within the scope of the B31.1 Code?

Reply (1): No, except as discussed in Para. 121.9.

Question (2): Does the B31.1 Code give recommendations or requirements for the materialsused in the construction of the structures described above?

Reply (2): No.





Subject: B31.1, 114.1 and 114.2.3, Threaded Insertion 'Qpe Flow Sensors


File: B31-90-020

Question (1): Is the manufacturer andlor fabricator of a pipe fitting or component responsible

for providing materials, components, and workmanship compliance with B31.1?

Reply (1): Yes, if ASME B31.1 is specified as the jurisdictional Code.

Question (2): Is a threaded insertion type flow sensor governed by Paras. 114.2.3 and 114.1?

Reply (2): The threaded connection is governed by Paras. 114.1 and 114.2.3. The design and

installation of the insertion device should be adequate to withstand the effects of the fluid charac-

teristics, fluid flow, and vibration.

Question (3): If the response to Question (2) is yes, does a polypropylene insertion flow sensorwhich is retained in the service by its threaded connection meet the intents and purposes of Paras.

114.2.3 and 114.1?

Reply (3): A polypropylene insertion type flow sensor which is retained in the service by its

threaded connection can meet the intents and purposes of Paras. 114.1 and 114.2.3.

Question (4): Paragraph 122.9'states "where it is necessary" plastic materials may be used to

convey corrosive or hazardous liquids. Should this paragraph be interpreted as prohibiting the use

of thermoplastics for conveying corrosive or hazardous liquids when the use of thermoplastics is not

"necessary"?

Reply (4): No

asme b31.1 (interpretação nº 21)

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