1、Building Services Piping ASME Code for Pressure Piping, B31 AN AMERICAN NATIONAL STANDARD ASME B31.9-2017 (Revision of ASME B31.9-2014)ASME B31.9-2017 (Revision of ASME B31.9-2014) Building Services Piping ASME Code for Pressure Piping, B31 AN AMERICAN NATIONAL STANDARD xDate of Issuance: December 2
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12、the publisher . The American Society of Mechanical Engineers Two Park Avenue, New York, NY 10016-5990 Copyright 2017 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All rights reserved Printed in U.S.A.CONTENTS Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi Committee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix Summary of Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi Chapter I Scope and Definitions . . . . . . . . . . . . . . . . . . . . .
15、. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 900 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Chapter II Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16、. . . . . . . . . . . . . . . . 9 PART 1 Conditions and Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 901 Design Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 902 Desig
17、n Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 PART 2 Pressure Design of Piping Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 903 Criteria for Pressure Design of Piping Components . . .
18、. . . . . . . . . . . . . . . . . . . . . . . . . . 11 904 Pressure Design of Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 PART 3 Selection and Limitation of Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 905 P
19、ipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 906 Fittings, Bends, and Intersections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 907 Valves . . . . . . . . . . . . . . .
20、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 908 Flanges, Blanks, Gaskets, and Bolting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 PART 4 Selection and Limitation of Joints . . . . . . . . . . . . . . . . . . .
21、. . . . . . . . . . . . . . . . . . . . . 15 910 Piping Joints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 911 Welded Joints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22、. . . . . 15 912 Flanged Joints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 913 Mechanical and Proprietary Joints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 914 Threaded Joints . . . . .
23、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 915 Flared, Flareless, and Compression Joints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 916 Bell and Spigot Joints . . . . . . . . . . . . . . . . . . . . . . . . .
24、 . . . . . . . . . . . . . . . . . . . . . . . . . . 16 917 Brazed and Soldered Joints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 PART 5 Expansion, Flexibility, and Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25、 17 919 Expansion and Flexibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 920 Loads on Pipe- Supporting Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 921 Design of Pipe- Supporting Elements . . .
26、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 PART 6 Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 922 Design Requirements Pertaining to Specific Piping Systems . . . . . . . . . . . .
27、. . . . . . . . . . . 25 Chapter III Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 923 Materials General Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Chapter IV Com
28、ponent Requirements and Standard Practices . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 926 Dimensions and Ratings of Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Chapter V Fabrication, Assembly, and Erection . . . . . . . . . . . . . . . . . .
29、. . . . . . . . . . . . . . . . . . . . 36 iii927 Welded Fabrication of Metals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 928 Brazing and Soldering of Metals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 929
30、 Bending . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 930 Forming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 931 Heat Treatment . . . . . . .
31、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 934 Fabrication of Nonmetals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 935 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Chapter VI Inspection, Examination, and Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 936 Inspection and Examination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
33、 . . . . 45 937 Leak Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Mandatory Appendices I Stress Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
34、II Allowable Pressures for Nonmetallic, Nonplastic Pressure Piping . . . . . . . . . . . . . . . . . . . 56 III Reference Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 IV Preparation of Technical Inquiries . . . . . . . . . . . . .
35、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 Nonmandatory Appendices A Nonmandatory Quality System Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 B Seismic Design and Retrofit of Piping Systems . . . . . . . . . . . . . . . . . . . . . . . . . . .
36、 . . . . . . 63 Figures 900.1.2 Code Jurisdictional Limits for Piping Drum- Type Boilers . . . . . . . . . . . . . . . . . . . . . . . 3 904.2.2 Nomenclature for Miter Joints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 921.1.3-1 Support Spans for Standa
37、rd Wall Steel Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 921.1.3-2 Support Spans for Copper and Thermoplastic Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 927.4.3-1 Fillet Weld Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
38、. . . . . . . . . . . . . . . . . . . . . . . 37 927.4.3-2 Minimum Weld Size, Setback, and Depth of Insertion for Slip-On and Socket Weld Flanges 38 927.4.3-3 Minimum Welding Dimensions for Socket- Welding Components Other Than Flanges . . . . . 38 927.4.5-1 Acceptable Welds for Flat Heads . . . . .
39、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 927.4.5-2 Unacceptable Welds for Flat Heads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 927.4.6-1 Typical Weld Branch Connections . . . . . . . . . . . . . . . . . . . . . . . . . .
40、 . . . . . . . . . . . . . . . . 40 927.4.6-2 Typical Weld Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Tables 902.4.3 Joint Factors, e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
41、. . . . . . . 11 904.2.1 Pipe Thickness for Bends . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 917.3 Rated Internal Working Pressures of Joints Made With Copper Water Tube and Solder Joint Fittings, psig . . . . . . . . . . . . . . . . . . . . .
42、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 919.3.1 Moduli of Elasticity and Thermal Expansion Coefficients . . . . . . . . . . . . . . . . . . . . . . . . . 18 921.2.2 Capacities of Threaded ASTM A36 Steel Rods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
43、 . . 24 926.1 Component Standards and Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 926.2 Standard Practices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 I-1 Allowable Stresses . . . . . . . .
44、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 I-2 Hydrostatic Design Stresses (HDS) and Recommended Temperature Limits for Thermoplastic Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
45、. . . . . . 53 ivI-3 Design Stress Values for Contact Molded (Hand-Lay-Up) Pipe Made From Reinforced Thermosetting Resins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 I-4 Hydrostatic Design Basis Stress for Machine-Made Thermosetting Resin Pipe .
46、 . . . . . . . . . 55 II-1 Allowable Pressures for Nonmetallic, Nonplastic Pressure Piping . . . . . . . . . . . . . . . . . . . 56 B-3.2.1 Seismic Design Requirements, Applicable Sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 B-3.3.1 Maximum Span (ft) Between Lateral Seismi
47、c Restraints for Steel Pipe With a Yield Stress of 35 ksi, in Water Service at 70F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 vFOREWORD The need for a national code for pressure piping became increasingly evident from 1915 to 1925. The American Standards
48、 Association (ASA) initiated the B31 Project in March 1926 to meet that need. The American Society of Mechanical Engineers (ASME) proposed the work and has served as sponsor since its inception. The first edition was published in 1935 as the American Tentative Standard Code for Pressure Piping. To k
49、eep the Code abreast of developments in design, welding, and of new standards and specifications, as well as of developments in service conditions, new or supplementary editions were issued as follows: B31.1-1942 American Standard Code for Pressure Piping B31.1a-1944 Supplement 1 B31.1b-1947 Supplement 2 B31.1-1951 American Standard Code for Pressure Piping B31.1a-1953 Supplement 1 to B31.1-1951 B31.1-1955 American Standard Code for Pressure Piping In 1955, a decision was made to develop and publish separate Code Sections for various industries. The current Sections are as follows: B3
