1、AN AMERICAN NATIONAL STANDARDRefrigeration Piping andHeat Transfer ComponentsASME B31.5-2006(Revision of ASME B31.5-2001)ASME Code for Pressure Piping, B31Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from I
2、HS-,-,-ASME B31.5-2006(Revision of ASME B31.5-2001)RefrigerationPiping andHeat TransferComponentsASME Code for Pressure Piping, B31AN AMERICAN NATIONAL STANDARDThree Park Avenue New York, NY 10016Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or ne
3、tworking permitted without license from IHS-,-,-Date of Issuance: July 20, 2007The next edition of this Code is scheduled for publication in 2009. This Code will become effective6 months after the Date of Issuance. There will be no addenda issued to this edition.ASME issues written replies to inquir
4、ies concerning interpretations of technical aspects of thisStandard. The interpretations will be included with this edition. Interpretations are published on theASME Web site under the Committee Pages at http:/cstools.asme.org as they are issued.ASME is the registered trademark of The American Socie
5、ty of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria for American NationalStandards. The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an oppo
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10、by individuals.No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior written permission of the publisher.The American Society of Mechanical EngineersThree Park Avenue, New York, NY 10016-5990Copyright 2007 byTHE AMERICAN SOCIETY OF ME
11、CHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-CONTENTSForeword vCommittee Roster . viIntroduction . viiiSummary of Changes xChapter I Scope
12、and Definitions 1500 General Statements 1Chapter II Design. 7Part 1 Conditions and Criteria . 7501 Design Conditions 7502 Design Criteria 8Part 2 Design of Piping Components 23503 Criteria for Design of Piping Components . 23504 Pressure Design of Piping Components 23Part 3 Design Application of Pip
13、ing Components Selection and Limitations 32505 Pipe 32506 Fittings, Bends, and Intersections 33507 Valves 34508 Flanges, Blanks, Flange Facings, Gaskets, and Bolting 34Part 4 Selection and Limitations of Piping Joints . 34510 Piping Joints 34511 Welded Joints . 35512 Flanged Joints . 35513 Expanded
14、Joints 35514 Threaded Joints . 35515 Flared, Flareless, and Compression Joints 35517 Brazed and Soldered Joints 36518 Sleeve Coupled and Other Novel or Patented Joints 36Part 5 Expansion, Flexibility, Structural Attachments, Supports, and Restraints 36519 Expansion and Flexibility 36520 Design of Pi
15、pe Supporting Elements . 45521 Design Loads for Pipe Supporting Elements . 46Chapter III Materials 48523 Materials General Requirements 48524 Materials Applied to Miscellaneous Parts 52Chapter IV Dimensional Requirements 55526 Dimensional Requirements for Standard and Nonstandard PipingComponents 55
16、Chapter V Fabrication and Assembly . 57527 Welding 57528 Brazing and Soldering . 64529 Bending Hot and Cold 65530 Forming 65531 Heat Treatment . 65535 Assembly . 68Chapter VI Examination, Inspection, and Testing 70536 Examination 70iiiCopyright ASME International Provided by IHS under license with A
17、SME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-537 Inspection 71538 Testing . 72539 Records . 73Figures502.3.2 Stress Range Reduction Factors 22504.3.1-1 Reinforcement of Branch Connections 26504.3.1-2 Extruded Outlet Header Notation . 28504.3.1-3 Mechanically
18、 Formed Tee Connections in Copper Materials 30504.5.3 Blanks 32519.4.5-1 Bends . 43519.4.5-2 Branch Connections . 44523.2.2 Reduction in Minimum Design Metal Temperature Without ImpactTesting . 53527.1.2 Typical Joints With Backing Ring 57527.2.1-1 Butt Welding End Preparation . 58527.2.1-2 Internal
19、 Trimming for Butt Welding of Piping Components With InternalMisalignment . 58527.3.3-1 Fillet Weld Size . 59527.3.3-2 Welding Details for Slip-On and Socket Welding Flanges, and SomeAcceptable Types of Flange Attachment Welds . 60527.3.3-3 Minimum Welding Dimensions Required for Socket WeldingCompo
20、nents Other Than Flanges 60527.3.5-1 Typical Welded Branch Connection Without Additional Reinforcement . 61527.3.5-2 Typical Welded Branch Connection With Additional Reinforcement . 61527.3.5-3 Typical Welded Angular Branch Connection Without AdditionalReinforcement 61527.3.5-4 Some Acceptable Types
21、 of Welded Branch Attachment Details ShowingMinimum Acceptable Welds 62527.3.6-1 Acceptable Welds for Flat Plate Closures . 63527.3.6-2 Unacceptable Welds for Flat Plate Closures 63Tables500.2-1 Refrigerant Safety Classifications 4500.2-2 Safety Classifications for Refrigerant Blends 6502.3.1 Maximu
22、m Allowable Stress Values, ksi 10519.3.1 Thermal Expansion Data (IP and SI) . 38519.3.2 Moduli of Elasticity (IP and SI) 39519.3.6 Flexibility Factor, k, and Stress Intensification Factor, i 40521.3.1 Minimum Sizes of Straps, Rods, and Chains for Hangers . 47523.1 Acceptable Materials Specifications
23、 . 49523.2.2 Impact Exemption Temperatures . 54526.1 Dimensional Standards 56531.2.1 Heat Treatment of Welds 66Nonmandatory AppendicesA Referenced Standards . 75B Preparation of Technical Inquiries . 78C Selecting Applicable Piping Codes . 79ivCopyright ASME International Provided by IHS under licen
24、se with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-FOREWORDThe need for a national code for pressure pipingbecame increasingly evident from 1915 to 1925. To meetthis need, the American Engineering Standards Commit-tee (later changed to American Standards
25、Association,then changed to United States of America StandardsInstitute, and now known as the American NationalStandards Institute) initiated project B31 in March 1926,at the request of the American Society of MechanicalEngineers and with that Society the sole administrativesponsor. Because of the w
26、ide field involved, SectionalCommittee B31, later changed to Standards Committee,was composed of representatives of some 40 differentengineering societies, industries, government bureaus,institutes, and trade associations. After several yearswork, the first edition was published in 1935 as an Amer-i
27、can Tentative Standard Code for Pressure Piping.In order to keep the Code abreast of current develop-ments in piping design, welding, stress computations,new dimensional and material standards and specifica-tions, and increases in the severity of service conditions,revisions, supplements, and new ed
28、itions of the Codewere published as follows:B31.1-1942 American Standard Code for PressurePipingB31.1a-1944 Supplement 1B31.1b-1947 Supplement 2B31.1-1951 American Standard Code for PressurePipingB31.1a-1953 Supplement 1 to B31.1-1951B31.1-1955 American Standard Code for PressurePipingvIn 1952, a ne
29、w section of the Code was published tocover Gas Transmission and Distribution Piping Sys-tems. In 1955, after a review by B31 Executive and Sec-tional Committees, a decision was made to develop andpublish other industry sections as separate code docu-ments of the American Standard Code for PressureP
30、iping.The first edition of Refrigeration Piping was publishedas ASA B31.5-1962 superseding Section 5 of B31.1-1955.This Section was revised in 1966. Following approvalby the Sectional Committee and the sponsor, this revi-sion was approved by the United States of AmericaStandards Institute on Septemb
31、er 8, 1966, and desig-nated USAS B31.5-1966. Revision of this Section wasapproved on April 18, 1974, by the American NationalStandards Institute and designated ANSI B31.5-1974.In December 1978, the American National StandardsCommittee B31 was reorganized as the ASME Code forPressure Piping, B31. Com
32、mittee under proceduresdeveloped by the American Society of Mechanical Engi-neers and accredited by the American National Stan-dards Institute. The Code designation was also changedto ANSI/ASME B31.Previous editions of this Code include those of 1983,1987, 1989, 1992, and 2001. The 2006 Edition of t
33、he Codeis a compilation of the 2001 Edition and the B31.5a-2004Addenda.In this, the 2006 Edition, the values in the tables havebeen updated to keep the Code consistent with industrytrends.This Code was approved as an American NationalStandard on November 6, 2006.(06)Copyright ASME International Prov
34、ided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ASME B31 COMMITTEECode for Pressure Piping(The following is the roster of the Committee at the time of approval of this Code.)COMMITTEE OFFICERSD. R. Frikken, ChairK. C. Bodenhamer,
35、 Vice ChairP. D. Stumpf, SecretaryCOMMITTEE PERSONNELH. A. Ainsworth, ConsultantR. J. T. Appleby, ExxonMobil Upstream Research Co.C. Becht, Becht Engineering Co.A. E. Beyer, Fluor DanielK. C. Bodenhamer, Enterprise Products Co.J. S. Chin, El Paso Corp.D. L. Coym, Worley ParsonsD. M. Fox, Atmos Energ
36、yJ. W. Frey, Stress Engineering Service, Inc.D. R. Frikken, Becht Engineering Co.R. A. Grichuk, Fluor Corp.L. E. Hayden, Jr., ConsultantG. A. Jolly, Vogt Valves Flowserve Corp.W. J. Koves, UOP LLCR. P. Merrill, Evapco, Inc.B31.5 REFRIGERATION PIPING SECTION COMMITTEER. P. Merrill, Chair, Evapco, Inc
37、.R. A. Appleton, Vice Chair, Refrigeration Systems Co.S. Vasquez, Secretary, The American Society of MechanicalEngineersM. R. Braz, Carter editorial changes, revisions, and correc-tions; and the following changes identified by a margin note, (06).Page Location Changev Foreword Last three paragraphs
38、updated to reflectthe current editionviii Introduction Revised in its entirety1 500 First paragraph revised16 500.2 (1) First paragraph revised(2) Definitions of butt joint; gas tungsten-arc welding (GTAW); heat treatment;furnace butt welded, continuous welded;secondary coolant; size of weld; solder
39、edjoint; submerged arc welding (SAW); tackweld; throat of a fillet weld; toe of weld;tube; undercut; and weld revised(3) Definition of nominal addedTable 500.2-1 General Notes addedTable 500.2-2 General Notes added7 501.2.4(c) Revised501.5.2 Revised501.5.3 Revised8 502.3.1(a) Fifth paragraph revised
40、9 502.3.1(b) (1) Second and third paragraphs revised(2) Fourth paragraph deleted502.3.1(c) Subparagraphs (1), (2), and (4) revised502.3.1(e) Revised1021 Table 502.3.1 Revised in its entirety24 504.2.1(e) Revised504.3.1(c)(2) Revised504.3.1(d)(2) Revised25 504.3.1(e)(2) Revised504.3.1(f)(1) Revised26
41、 Fig. 504.3.1-1 General note revised29 504.3.2(b)(1) Revised31 504.4.1(b) Definition of c revised504.4.2 (1) Definition of tsdeleted(2) Definition of tnaddedxCopyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license fro
42、m IHS-,-,-Page Location Change33 505.1.1 Second paragraph revised34 508.1.2 Revised35 511.3.1 Revised511.5 Revised36 517(c) Revised48 523.1 Revised in its entirety48, 52 523.2.2(f) (1) Subparagraphs (4) and (5) revised(2) Subparagraphs (7) through (9) added523.2.4 Revised53 Fig. 523.2.2 Revised54 Ta
43、ble 523.2.2 (1) Last column added(2) General note and Notes (1) and (2)revised56 Table 526.1 Revised57 527.1.1 Revised59 Fig. 527.3.3-1 Revised60 Fig. 527.3.3-2 RevisedFig. 527.3.3-3 Revised62 527.4.4 Revised68 535.3.3 Revised535.5 Revised69 535.10 Added72 538.3(a) Revised538.4.1 Revised538.4.2(b) R
44、evised72, 73 538.6(a) Revised538.8(e) Revised7577 Nonmandatory Revised in its entiretyAppendix A79, 80 Nonmandatory AddedAppendix CSPECIAL NOTE:The Interpretations to ASME B31.5 are included in this edition as a separate section for the usersconvenience.xiCopyright ASME International Provided by IHS
45、 under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-xiiCopyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-(06)ASME B31.5-2006REFRIGERATION PIPI
46、NG AND HEAT TRANSFER COMPONENTSChapter IScope and Definitions500 GENERAL STATEMENTSThis Refrigeration Piping and Heat Transfer Compo-nents Code is a Section of the American Society ofMechanical Engineers Code for Pressure Piping, B31.This Section is published as a separate document forsimplicity and
47、 for convenience of Code users. The usersof this Code are advised that in some areas legislationmay establish governmental jurisdiction over the subjectmatter covered by the Code. The owner of a pipinginstallation shall choose which piping code(s) are appli-cable to the installation and shall have t
48、he overallresponsibility for compliance with this Code. (See Non-mandatory Appendix C.) The owner of a complete pip-ing installation shall have the overall responsibility forcompliance with this Code.It is required that the engineering design specify anyspecial requirements pertinent to the particul
49、ar serviceinvolved. For example, the engineering design shall notfor any service specify a weld quality lower than thatstipulated in para. 527.3.2(d) for the Code-requiredvisual examination quality and for the types of weldsinvolved; but where service requirements necessitateadded quality and more extensive nondestructive
