ASME B31.9-2011

(Revision of ASME B31.9-2008)

Building Services Piping

ASME Code for Pressure Piping, B31

A N A M E R I C A N N A T I O N A L S T A N D A R D

ASME B31.9-2011

(Revision of ASME B31.9-2008)

ASME B31.9-2011

(Revision of ASME B31.9-2008)

Building Services Piping

ASME Code for Pressure Piping, B31

AN AMERICAN NA TIONAL S T AND ARD

Three Park Avenue • New York, NY • 10016 USA

Date of Issuance: May 31, 2011

The next edition of this Code is scheduled for publication in 2014. This Code will become effective 6 months after the Date of Issuance. There will be no addenda issued to this edition.

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The American Society of Mechanical Engineers Three Park Avenue, New York, NY 10016-5990

Copyright © 2011 by

THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS

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CONTENTS

Foreword v

Committee Roster vi

Introduction viii

Summary of Changes x

iii

Mandatory Appendices

1. Stress Tables 47

2. Allowable Pressures for Nonmetallic, Nonplastic Pressure Piping 57

3. Reference Standards 58

4. Preparation of Technical Inquiries 61

Nonmandatory Appendices

1. Nonmandatory Quality System Program 62

2. Seismic Design and Retrofit of Piping Systems 63

Index 67

iv

FOREWORD

The need for a national code for pressure piping became increasingly evident from 1915 to 1925. The American Standards 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 keep 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 B31.1-1942 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:

B31.1 Power Piping B31.3 Process Piping

B31.4 Pipeline Transportation Systems for Liquid Hydrocarbons and Other Liquids B31.5 Refrigeration Piping

B31.8 Gas Transmission and Distribution Piping Systems B31.9 Building Services Piping

B31.11 Slurry Transportation Piping Systems

In 1969, ASA, renamed the United States of America Standards Institute (USASI), became the American National Standards Institute (ANSI), and the B31 Sectional Committee became the B31 Standards Committee. In 1978, ASME was granted accreditation by ANSI to organize the B31 Committee as the ASME Code for Pressure Piping, with Code Sections designated as ANSI/ ASME B31.

Need for a separate Building Services Section of the Code for Pressure Piping was recognized for several years. This new Code Section, ASME B31.9 Building Services Piping, first issued in 1982, was developed to fill that need.

The Code has intentionally been written on a conservative basis in order to avoid the necessity for complex design, fabrication, and inspection criteria. For this reason, application of this Code is expected to be simple and straightforward.

Metric (SI) units have been added in parentheses after U.S. Customary units. This Code is based on U.S. Customary Units. The 2008 edition was approved by ANSI on April 1, 2008, and designated as ASME B31.9-2008.

The 2011 edition of B31.9 contains revisions to the definitions and materials section of the Standard. Additionally, the allowable stress values have been updated to the 3.5 design margin. Following approval by the B31 Main Committee and the ASME Board on Pressure Technology Codes and Standards, and after public review, this Code Section was approved by ANSI on

February 11, 2011.

v

ASME B31 COMMITTEE

Code for Pressure Piping

(The following is the roster of the Committee at the time of approval of this Code.)

STANDARDS COMMITTEE OFFICERS

M. L. Nayyar, Chair

J. E. Meyer, Vice Chair

N. Lobo, Secretary

R. J. Appleby, ExxonMobil Development Co.

C. Becht IV, Becht Engineering Company, Inc.

A. E. Beyer, Fluor Enterprises

K. C. Bodenhamer, EPCO, Inc.

C. J. Campbell, Air Liquide

J. S. Chin, TransCanada Pipeline U.S.

D. D. Christian, Victaulic Co.

D. L. Coym, Worley Parsons

R. P. Deubler, Fronek Power Systems, LLC

J. A. Drake, Spectra Energy Transmission

P. D. Flenner, Flenner Engineering Services

J. W. Frey, Stress Engineering Services, Inc.

D. R. Frikken, Becht Engineering Company, Inc.

R. A. Grichuk, Fluor Corp.

R. W. Haupt, Consultant

B. P. Holbrook, Babcock Power, Inc.

G. A. Jolly, Vogt Valves Flowserve Corp.

STANDARDS COMMITTEE PERSONNEL

N. Lobo, The American Society of Mechanical Engineers

W. J. Mauro, American Electric Power

J. E. Meyer, Louis Perry & Associates, Inc.

M. L. Nayyar, Bechtel Power Corp.

R. G. Payne, Alstom Power, Inc.

G. R. Petru, EPCO, Inc.

E. H. Rinaca, Dominion Resources, Inc.

M. J. Rosenfeld, Kiefner & Associates, Inc.

R. J. Silvia, Process Engineers and Constructors, Inc.

W. J. Sperko, Sperko Engineering Services, Inc.

F. W. Tatar, FM Global

K. A. Vilminot, Black & Veatch

R. A. Appleton, Contributing Member, Refrigeration Systems Co.

A. Soni, Delegate, Engineers India Ltd.

L. E. Hayden, Jr., Ex-Officio Member, Consultant

W. J. Koves, Ex-Officio Member, Pi Engineering Software, Inc.

A. P. Rangus, Ex-Officio Member, Bechtel

J. T. Schmitz, Ex-Officio Member, Southwest Gas Corp.

D. D. Christian, Chair, Victaulic Co.

B31.9 BUILDING SERVICES PIPING SECTION COMMITTEE

R. D. Gilligan, Consultant

J. W. Willis, Vice Chair, Page Southerland Page, LLP

A. P. Maslowski, Secretary, The American Society of Mechanical Engineers

M. H. Barnes, Scantec, Inc.

P. A. Bourquin, Consultant

L. E. Hayden, Jr., Consultant

L. A. Loziuk, Consultant

T. Q. McCawley, TQM Engineering

W. J. Sperko, Sperko Engineering Services, Inc.

F. R. Volgstadt, Consultant

A. P. Rangus, Chair, Bechtel

B31 FABRICATION AND EXAMINATION COMMITTEE

S. P. Licud, Bechtel National, Inc.

R. J. Horvath, Jr., Secretary, The American Society of Mechanical Engineers

J. P. Ellenberger, Consultant

R. J. Ferguson, Metallurgist

D. J. Fetzner, BP Exploration Alaska, Inc.

P. D. Flenner, Consultant

J. W. Frey, Stress Engineering Services, Inc.

W. W. Lewis, E. I. Du Pont

T. Monday, Team Industries, Inc.

A. D. Nalbandian, Thielsch Engineering, Inc.

R. I. Seals, Consultant

R. J. Silvia, Process Engineering & Constructors, Inc.

W. J. Sperko, Sperko Engineering Services, Inc.

E. F. Summers, Jr., Babcock & Wilcox Construction Co.

P. L. Vaughan, Oneok Partners

vi

1. A. Grichuk, Chair, Fluor Enterprise, Inc.

   B31 MATERIALS TECHNICAL COMMITTEE

   1. B. Pickell, Willbros Engineers, Inc.

   2. Lobo, Secretary, The American Society of Mechanical Engineers

R. P. Deubler, Fronek Power Systems LLC

W. H. Eskridge, Jr., Aker Solutions E & C

C. L. Henley, Black & Veatch

M. L. Nayyar, Bechtel Power Corp.

D. W. Rahoi, CCM 2000

R. A. Schmidt, Canadoil

H. R. Simpson, Stantec

J. L. Smith, Jacobs Engineering Group

Z. Djilali, Contributing Member, BEREP

B31 MECHANICAL DESIGN TECHNICAL COMMITTEE

W. J. Koves, Chair, Pi Engineering Software, Inc.

G. A. Antaki, Vice Chair, Becht Engineering Company, Inc.

C. E. O’Brien, Secretary, The American Society of Mechanical Engineers

C. Becht IV, Becht Engineering Company, Inc.

J. P. Breen, Becht Engineering Company, Inc.

N. F. Consumo, Sr., GE Energy (IGCC) NPI

J. P. Ellenberger, Consultant