Ansi B31.1

ASME B31.1-2004
(Revision of ASME B31.1-2001)

Power Piping
ASME Code for Pressure Piping, B31

A N A M E R I C A N N AT I O N A L STA N DA R D

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POWER PIPING
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ASME B31.1-2004
(Revision of ASME B31.1-2001) ASME CODE FOR PRESSURE PIPING, B31

Date of Issuance: August 16, 2004

Mandatory Date: February 16, 2005 This Edition was approved by the American National Standards Institute anddesignated ASME B31.1-2004 on January 14, 2004

The 2004 Edition of this Code is being issued with an automatic update service that includes Addenda, Interpretations, and Cases. The next Edition is scheduled for publication in 2007. The use of Addenda allows revisions made in response to public review comments or committee actions to be published on a regular basis; revisions published in Addendawill become effective 6 months after the Date of Issuance of the Addenda. ASME issues written replies to inquiries concerning interpretations of technical aspects of the Code. The Interpretations are published in a separate supplement. Periodically certain actions of the ASME B31 Committee will be published as Cases. While these Cases do not constitute formal revisions of the Code, they may beused in specifications, or otherwise, as representing considered opinions of the Committee. The Cases are published in a separate supplement. The user of the Code will note that metric equivalents of U.S. Customary units appear throughout this issue of the Code (except for Appendix II). The values stated in U.S. Customary units are to be regarded as standard.

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Copyright © 2004 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All rights reserved Printed in U.S.A.

CONTENTS
Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....