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ASME B31.3-2004
(Revision of ASME B31.3-2002)

Process Piping
ASME Code for Pressure Piping, B31

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

Copyright ASME International
C Main for Blind IHSin /5938179006
Provided by log under license with ASME
le, 11/24/2005 11:27:13 networking permitted without license from IHS
Noreproduction or MST

ASME B31.3-2004
(Revision of ASME B31.3-2002)

Process Piping
ASME CODE FOR PRESSURE PIPING, B31

A N A M E R I C A N N AT I O N A L S TA N D A R D

Three Park Avenue • New York, NY 10016

Date of Issuance: April 29, 2005

Mandatory Date: October 31, 2005
This edition was approved by the American National Standards Institute
and designated ASME B31.3-2004 on June 24,2004.

The next edition of this Code is scheduled for publication in 2006. There will be no addenda
issued to ASME B31.3-2004.
ASME issues written replies to inquiries concerning interpretations of technical aspects of the
Code. Interpretations are published on the ASME Web site under the Committee Pages at http://
www.asme.org/codes/ as they are issued.
Periodically certain actions of theASME B31 Committee will be published as Cases. While these
Cases do not constitute formal revisions of the Code, they may be used in specifications, or otherwise,
as representing considered opinions of the Committee. The Cases are not part of the Code and are
published separately.

ASME is the registered trademark of The American Society of Mechanical Engineers.
This code or standard wasdeveloped under procedures accredited as meeting the criteria for American National
Standards. The Standards Committee that approved the code or standard was balanced to assure that individuals from
competent and concerned interests have had an opportunity to participate. The proposed code or standard was made
available for public review and comment, which provides an opportunity for additionalpublic input from industry,
academia, regulatory agencies, and the public-at-large.
ASME does not “approve,” “rate,” or “endorse” any item, construction, proprietary device, or activity.
ASME does not take any position with respect to the validity of any patent rights asserted in connection with any
items mentioned in this document, and does not undertake to insure anyone utilizing a standardagainst liability for
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ASME accepts responsibility for only those interpretations issued in accordance with governing ASME procedures and
policies which preclude the issuance of interpretations by individual volunteers.

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

Copyright © 2005 by
THEAMERICAN SOCIETY OF MECHANICAL ENGINEERS
All rights reserved
Printed in U.S.A.

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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.

CONTENTS
Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
xi
Committee Personnel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....
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