iii
DISCLAIMER AND COPYRIGHT
The American Gas Association’s (AGA) Operations and Engineering Section provides a forum for industry
experts to bring their collective knowledge together to improve the state of the art in the areas of operating,
engineering and technological aspects of producing, gathering, transporting, storing, distributing, measuring and
utilizing natural gas.
Through its publications, of which this is one, AGA provides for the exchange of information within the natural
gas industry and scientific, trade and governmental organizations. Many AGA publications are prepared or
sponsored by an AGA Operations and Engineering Section technical committee. While AGA may administer the
process, neither AGA nor the technical committee independently tests, evaluates or verifies the accuracy of any
information or the soundness of any judgments contained therein.
AGA disclaims liability for any personal injury, property or other damages of any nature whatsoever, whether
special, indirect, consequential or compensatory, directly or indirectly resulting from the publication, use of or
reliance on AGA publications. AGA makes no guaranty or warranty as to the accuracy and completeness of any
information published therein. The information contained therein is provided on an “as is” basis and AGA makes
no representations or warranties including any expressed or implied warranty of merchantability or fitness for a
particular purpose. Nothing contained in this document should be viewed as an endorsement or disapproval of any
particular manufacturer or product.
In issuing and making this document available, AGA is not undertaking to render professional or other services
for or on behalf of any person or entity. Nor is AGA undertaking to perform any duty owed by any person or
entity to someone else. Anyone using this document should rely on his or her own independent judgment or, as
appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any
given circumstances.
AGA has no power, nor does it undertake, to police or enforce compliance with the contents of this document.
Nor does AGA list, certify, test or inspect products, designs or installations for compliance with this document.
Any certification or other statement of compliance is solely the responsibility of the certifier or maker of the
statement.
AGA does not take any position with respect to the validity of any patent rights asserted in connection with any
items that are mentioned in or are the subject of AGA publications, and AGA disclaims liability for the
infringement of any patent resulting from the use of or reliance on its publications. Users of these publications are
expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such
rights, is entirely their own responsibility.
Users of this publication should consult applicable federal, state and local laws and regulations. AGA does not,
through its publications, intend to urge action that is not in compliance with applicable laws, and its publications
may not be construed as doing so. Information concerning safety risks, proper installation or use, performance or
fitness or suitability for any purpose with respect to particular products or materials should be obtained from the
manufacturer or supplier of the material used.
Changes to this document may become necessary from time to time. If changes are believed appropriate by any
person or entity, such suggested changes should be communicated to AGA in writing and sent to: Operations &
Engineering Section, American Gas Association, 400 North Capitol Street, NW, 4
th
Floor, Washington, DC
20001, U.S.A. or E-mail to: publications@aga.org. Suggested changes must include: contact information,
including name, address and any corporate affiliation; full name of the document; suggested revisions to the
text of the document; the rationale for the suggested revisions; and permission to use the suggested revisions
in an amended publication of the document.
Copyright © 2017, American Gas Association, All Rights Reserved.
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