INDD B31.1 92 2595512 0078031 7T0 M ADOPTION NOTICE ...

1 indd 92 m 2595512 0078031 7T0 , "Piping, Power," was adopted on October 3, 1994for use by the Department of Defense (DoD). Proposedchanges by DoD activities must be submitted to the DoDAdopting Activity: Commanding Officer, Naval ConstructionBattalion Center, Code 156, 1000 23rd Avenue, Port Hueneme,CA 93043-4301. DoD activities may obtain copies of thisstandard from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA private sector and other Government agencies maypurchase copies from the American Society of MechanicalEngineers, 345 East 47th Street, New York, NY :Army -MENavy -YD-1 Air Force -99 Adopting ActivityNavy -YD-1 FSC 4710 DISTRIBUTION STATEMENT A. Approved for public release;distribution is American Society of Mechanical EngineersLfensed by Information7 Handling ServicesM1Il1 IIII filltc)!@SI The American Society ofMechanical EngineersA N A M E R I C A NN A T I O N A LS T A N D A R DCOPYRIGHT American Society of ecLicensed by Information HandlingASME CODE FOR PRESSURE PIPING, B31 ASME (Revision of ASME )Rc~w5 od By GLOBALENGEGDOCUM hchanical Engineers e UAPsfAStServicesDate of Issuance: December 10, 2001 Mandatory Date: June 10, 20027his Edition was approved by the American National Standards Instituteand designated ASME on July 2, 2001 The 2001 Edition of this Code is being issued with an automatic update service thatincludes Addenda, Interpretations, and Cases.

2 The next Edition is scheduled for publicationin use of Addenda allows revisions made in response to public review comments orcommittee actions to be published on a regular basis; revisions published in Addenda willbecome effective 6 months after the Date of Issuance of the issues written replies to inquiries concerning interpretations of technical aspectsof the Code. The Interpretations are published in a separate certain actions of the ASME B31 Committee will be published as these Cases do not constitute formal revisions of the Code, they may be used inspecifications, or otherwise, as representing considered opinions of the Comrnittee. TheCases are published in a separate user of the Code will note that metric equivalents of Customary units appearthroughout this issue of the Code (except for Appendix II). The values stated in units are to be regarded as is the registered trademark of The American Society of Mechanical code or standard was developed under procedures accredited as meeting the criteria for AmericanNational Standards.

3 The Standards Comrnittee that approved the code or standard was balanced to assure thatindividuals from competent and concemed interests have had an opportunity to participate. le proposed codeor standard was made available for public review and comrnent which provides an opportunity for additionalpublic input from industry, academia, regulatory agencies, and the does not "approve," "rate." or "endorse" any item, construction, proprietary device, or does not take any position with respect to the validity of any patent rights asserted in connection withany items mentioned in this document, and does not undertake to insure anyone utilizing a standard againstliabilty for infringement of any applicable Letters Patent, nor assume any such liability. Users of a code orstandard are expressly advised that determination of the validity of any such patent rights, and the risk ofinfringement of such rights, is entirely their own by federal agency representative(s) or person(s)

4 Affiliated with industry is not to be interpretedas govemment or industry endorsement of this code or accepts responsibility for only those interpretations issued in accordance with goveming ASME procedures and policies which preclude the issuance of interpretations by individual part of this document may be reproduced in any form,in an electronic retrieval system or the prior written permission of the American Mechanical EngineersThree Park Avenue, New York, NY 10016-5990 Copyright C 2001 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll Rights ReservedPrinted in American Society of Mechanical EngineersLicensed by nformation Handlinq ServicesCONTENTSF oreword .. xPersonnel ..xiIntroduction .. xvSummary of Changes .. xixChapter I Scope and Definitions100 General .. Scope. Definitions. (A) Code Jurisdictional Lirnits for Piping -Forced Flow Steam GeneratorWith No Fixed Steam and Water Line.

5 (B) Code Jurisdictional Linits for Piping -Drum Type Boilers. (C) Code Jurisdictional Limits for Piping -Spray Type Desuperheater. 4 Chapter II DesignPart 1 Conditions and Criteria ..10101 Design Conditions .. General .. Pressure .. Temperature .. Ambient Influences .. Dynamic Effects .. Weight Effects .. Thermal Expansion and Contraction Loads ..11102 Design Criteria .. General .. Pressure-Temperature Ratings for Piping Components .. Allowable Stress Values and Other Stress Limits forPiping Components .. Allowances ..13 Part 2 Pressure Design of Piping Components. 16103 Criteria for Pressure Design of Piping Components ..16104 Pressure Design of Components .. Straight Pipe .. Curved Segments of Pipe .. Intersections .. Closures .. Pressure Design of Flanges and Blanks .. Reducers .. Other Pressure-Containing Components .. Analysis of Piping Components ..29iiiCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesPart 3 Selection and Limitations of Piping Components.

6 31105 Pipe .. General .. Metallic Pipe .. Nonmetallic Pipe .. 31106 Fittings, Bends, and Intersections .. Fittings .. Bends and Intersections .. Pipe Couplings .. Flexible Metal Hose Assembly .. 32107 Valves .. General .. Marking .. Ends .. Stem Threads .. Bonnet Joints .. Bypasses .. Safety, Safety Relief, and Relief Valves .. 33108 Pipe Flanges, Blanks, Flange Facings, Gaskets, and Bolting .. Flanges .. Blanks .. Flange Facings .. Gaskets .. U. S. Customary Bolting .. Metric Bolting .. 34 Part 4 Selection and Limitations of Piping Joints .. 35110 Piping Joints .. 35111 Welded Joints .. General .. Butt Welds .. Socket Welds .. Fillet Welds .. Seal Welds .. 35112 Flanged Joints .. 35113 Expanded or Rolled Joints .. 35114 Threaded Joints .. 40115 Flared, Flareless, and Compression Joints .. 40116 Caulked Joints ..41117 Brazed and Soldered Joints.

7 Limitations .. 41118 Sleeve Coupled and Other Proprietary Joints .. 41ivCOPYRIGHT American Society of Mechanical EngineersLicensed by Inforation Handling ServicesPart Expansion, leibility, and Supporting .. 41119 Expansion and Flexibility .. General .. Stress Range .. Local Overstrain .. Flexibility .. Properties .. Analysis .. Movements .. Cold Spring .. Reactions .. 44120 Loads on Pipe Supporting Elements .. General .. Supports, Anchors, and Guides .. 44121 Design of Pipe Supporting Elements .. General .. Allowable Stress Values .. Temperature Limitations .. Hanger Adjustments .. Hanger Spacing .. Springs .. Fixtures .. Structural Attachments .. Loads and Supporting Structures .. Requirements for Fabricating Pipe Supports .. 49 Part 6 Systems .. 49122 Design Requirements Pertaining to Specific Piping Systems .. Boiler External Piping; in Accordance With Para.

8 (A) -Steam,Feedwater, Blowoff, and Drain Piping .. Blowoff and Blowdown Piping in Nonboiler External Piping .. Instrument, Control, and Sampling Piping .. Spray Type Desuperheater Piping for Use on Steam Generators andReheat Piping .. Pressure Reducing Valves .. Pressure Relief Piping .. Piping for Flammable or Combustible Liquids .. Piping for Flammable Gases, Toxic Gases or Liquids, or NonflammableNontoxic Gases . Piping for Corrosive Liquids and Gases . Temporary Piping Systems . Steam Trap Piping . Exhaust and Pump Suction Piping . Pump Discharge Piping . District Heating and Steam Distribution Systems . (D) Reinforcement of Branch Connections . (G) Reinforced Extruded Outlets . Types of Permanent Blanks .. (C) Typical Globe Valves . Desuperheater Schematic Arrangement .58vCOPYRIGHT American Society of Mechanical XngineersLicensed by Information Handlinq (C) ( ) ( ) (A) (A).

9 (B)Chapter Range Reduction Factors ..Longitudinal Weld Joint Efficiency Factors ..Values of y ..Piping Flange Bolting, Facing, and Gasket Requirements ..Suggested Pipe Support Spacing ..Carrying Capacities of Threaded ASTM A 36, A 575, and A 576 Hot Rolled Carbon Steel ..Minimum Wall Thickness Requirements for Toxic Fluid Piping ..MaterialsGeneral Requirements ..Materials and Specifications ..Piping Components ..Pipe Supporting Elements ..Limitations on Materials ..General ..Steel ..Cast Gray Iron ..Malleable Iron ..Ductile (Nodular) Iron ..Nonferrous Metals ..Nonmetallic Pipe ..Deterioration of Materials in Service ..Materials Applied to Miscellaneous Parts ..Gaskets ..Bolting ..Dimensional RequirementsMaterial Specifications and Standards for Standard and Nonstandard PipingComponents ..Standard Piping Components ..Nonstandard Piping Components ..Referenced Documents.

10 Specifications and Standards ..Fabrication, Assembly, and ErectionWelding ..General ..Material ..Preparation for Welding ..Procedure ..Qualification ..Welding Records ..Brazing ..General ..Materials ..viCOPYRIGHT American Society of Mechanical EngineersLicensed by Xnformation Handlinq Preparation .. Procedure .. Qualification .. Brazing Records .. 85129 Bending and Forming .. Bending .. Forning .. Heat Treatment of Bends and Formed Components .. 85130 Requirements for Fabricating and Attaching Pipe Supports .. 86131 Welding Preheat .. Preheat Temperature .. Interruption of Welding .. 87i32 Postweld Heat Treatment .. Exemptions to Mandatory PWHT Requirements .. Definition of Thickness Governing PWHT .. PWHT Heating and Cooling Requirements .. Furnace Heating .. Local Heating .. 92133 Stamping .. 93135 Assembly .. General .. Alignment .. Bolted Flanged Connections.