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White Paper on Natural Gas Interchangeability and Non-Combustion End Use
Appendix A: Overview of Natural Gas Supply & Hist. Characterization Data
Appendix B: Impact of Changing Supply on Natural Gas Infrastructure
Appendix C: Changing Supply Impacts on End-Use
Appendix D: Monitoring Interchangeability and Combustion Fundamentals
Appendix E: Managing Interchangeability
Appendix G: Derivation of Interim Guideline Calculations
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White Paper on Liquid Hyrdocarbon Drop Out in Natural Gas Infrastructure - February 2005
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 Gas Quality 

AGA and the Natural Gas Council are sponsoring several key, ongoing activities on gas quality and interchangeability.  AGA is maintaining web-based information sources and links to other participating organizations in support of these activities.  The objective of this effort is to facilitate development of gas industry consensus on major technical and policy issues sought by the Natural Gas Council for interactions within the natural gas industry and with regulatory and public interest organizations. 

Gas quality and gas interchangeability issues are currently being addressed by the natural gas industry.  They are receiving attention for two reasons:  first, the current quality of domestic gas being delivered by the interstate pipelines has a higher heavy hydrocarbons content which leads to liquids dropout.  This fact is largely due to the current price environment, where natural gas prices are high and liquids prices are low, which creates a disincentive to process gas to strip out ethane, butane and propane.  Second, the increase of LNG imports creates an interchangeability challenge due to the high level of Btu for most imported LNG.

The Natural Gas Council has convened an industry-wide dialogue to address gas quality and interchangeability issues.  AGA is supportive of that process and has been actively engaged because it believes the industry should take the lead to address the problem collaboratively.  Gas quality and interchangeability issues are not suitable for standardization by the North American Energy Standards Board.

Gas quality specifications should be designed to ensure that gas tendered to and delivered by the interstate pipelines meets the requirements of end-use applications.  Gas quality specifications should not unreasonably limit the development of new or expanded gas supplies or limit the diversity of sources of gas supply.  Changes to pipeline tariffs should be explored that would establish acceptable gas quality specifications for supply delivered to the pipeline that will meet reasonable end-use requirements and ensure system safety and integrity.  The industry consensus means to do this is through the use of hydrocarbon dewpoint and interchangeability indices.

AGA's technical committees are further exploring the measurement and analytical issues surrounding the use of hydrocarbon dewpoint and the merits and limitations of the various interchangeability indices.  Finally, the existing flexibility used by interstate pipelines to meet various end use gas quality needs must remain as part of the industry-wide infrastructure to supply merchantable natural gas to customers.

AGA Activities

International Gas Union,  Programme Committee D1 Report:  LNG QUALITY & INTERCHANGEABILITY, 2006-2009 Triennium

AGA FERC Regulatory Committee Activities 

 AGA Report No. 4A Revision Task Group on Gas quality, sponsored by AGA Operating Section and representing all natural gas stake holders. Work on progress. Contact: Ali Quraishi (202/824-7337)

AGA Technical Staff Paper: Technical Background and Issues of Gas Interchangeability - April 2006

Natural Gas Council Activities

    * White Paper on Natural Gas Interchangeability - February 2005 (links below)
    * White Paper on Liquid Hyrdocarbon Drop Out in Natural Gas Infrastructure - February 2005

The Natural Gas Council Policy Steering Committee oversees the various gas industry consensus based activities addressing gas quality and interchangeability.  Contacts: Lori Traweek (202/824-7330), Andrew Soto (202/824-7226)

The Natural Gas Council Task Groups responsible for developing technical dialogue and consensus including:

    * The Gas Interchangeability Task Group hosted by AGA and representing stakeholder interests in compatibility of gas sources with current and future end uses.  Contact: Ted Williams (202/824-7313)

    * The Hydrocarbon Dew Point Task Group hosted by INGAA and representing stakeholders in liquid drop out issues in transmission and distribution systems.  Contact: Terry Boss (202/216-5930), Ali Quraishi (202/824-7337)

AGA and the Natural Gas Council are committed to open processes for developing consensus on technical and policy guidance and recommendations on gas quality and interchangeability.  As a result, the information found under these links is publicly available without restriction.  However, specific documents and information may represent, by and large, technical work in process focused on developing broad industry consensus.  As such, individual documents and commentary may not represent the views of AGA, the sponsoring organizations, or the authors’ organizations.  AGA welcomes the active participation of other interests within the gas industry on many of these activities.  Interested parties should contact the representative listed for the activity for more information.


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