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 ™In 2004 NIST Weights and Measures Division (WMD) responded to a Department of Energy request to assist U.S. stakeholders in the weights and measures and hydrogen communities in the development of uniform, fair, and appropriate legal metrology standards for hydrogen refueling equipment. For the latest updates on the national and international work related to the development of commercial hydrogen measurement standards and/or to participate in this work, please select from the list of topics below:
U.S. National Work Group  The USNWG works to promote, encourage, and participate in the establishment of a comprehensive set of legal metrology standards for commercial measurement of hydrogen for vehicle and other refueling applications including (1) device design, accuracy, installation, and use requirements; (2) method of sale requirements; (3) test procedures; and (4) fuel quality standards. The ultimate goal is that these standards will ensure the accuracy of measurements, enhance consumer protection, foster fair competition, and facilitate economic growth and trade. The USNWG works through in-person meetings, conference calls, and email. The USNWG is currently accomplishing its goals through two subcommittees; one will work to simultaneously develop equipment standards and test procedures and a second will develop fuel specification requirements.
Development of International Standards  Through its participation in the development of legal metrology standards NIST works to consider the interest of all stakeholders to avoid conflicts with related hydrogen standards developed by national and international standards and codes developing organizations. Currently, there are two international legal metrology standards which address commercial hydrogen measurement. R 81 "Dynamic Measuring Devices and Systems for Cryogenic Liquids" (1998) R 81 Status: NIST WMD is Secretariat for the International Organization of Legal Metrology (OIML) Recommendation 81 (R 81) and has responsibility for initiating work and ensuring that the standard progresses according to practices established by OIML. The Committee on International Legal Metrology approved a project to revise the 1998 version of R 81 to include: (1) new ISO and IEC Standards as recommended in OIML D 11 (2004), (2) new developments in hydrogen measurements, (3) revise density equations, and (4) any other remaining relevant standards and national documents. R 139 "Compressed Gaseous Fuel Measuring Systems for Vehicles" (2007) R 139 Status: This document was made available April 4, 2008 on the OIML web site. For copies of the latest drafts of R 81 or R 139, click here: http://www.oiml.org. NIST WMD Five Year Plan  The NIST Weights and Measures Division plans to carry out its mission to promote uniformity in standards and technology development, for weights and measures requirements and procedures, to facilitate trade, both nationally and internationally in support of the hydrogen economy. WMD has developed a long range plan to accomplish its goals to promote the United States transition to a hydrogen economy. NIST WMD plans over a five year period (2008-2012) to work with stakeholders in technical work sessions and other forums to develop commercial hydrogen measurement standards to address: (1) equipment performance codes; (2) method of sale requirements; (3) labeling and marking requirements; (4) fuel quality standards, sampling and testing procedures; (5) inspection procedures for equipment suitability and safety; (6) training of officials and service companies; and (7) education of all stakeholders on hydrogen measurement. These standards ensure the accuracy of commercial hydrogen measurements, enhance consumer protection, foster fair competition, and facilitate economic growth and trade. 2008 Analysis and work plan Draft device standards* Comparison of draft standard* to corresponding international standards 2009 Field trials of draft standard* Draft test procedures* for devices Draft method of sale regulations Draft quality regulations Proposals to introduce or modify corresponding international standards 2010 Field trials of draft test procedures* Training for test and inspection of devices* Draft sampling and laboratory procedures* 2011 Final device standard and test procedures* Final method of sale and quality regulation* Final sampling and laboratory testing* Training seminars on implementing standards and testing* Draft type evaluation criteria* Draft standard for devices delivering gaseous blends 2012 Training seminars on implementing standards and procedures* Review and revision of device and quality standards* Finalize type evaluation criteria and dispenser training* Field trials for draft standard for gaseous blend devices Draft test procedures for gaseous blend devices Draft sampling and laboratory test procedures for gaseous blend devices Draft device test procedures for liquid hydrogen *Currently, the U.S. National Work Group (USNWG) for the Development of Commercial Hydrogen Measurement Standards recognizes various forms hydrogen. However, the USNWG agreed to initially work on standards and test procedures for gaseous hydrogen applications because of predominant use of this form of hydrogen to fuel prototype vehicles and the gas metering technology is further along in its development. The USNWG will address liquid and, if necessary, other applications at a later stage in the process. WMQuarterly Articles and Other Hydrogen News  The NIST Weights and Measures Division publishes a quarterly newsletter available at http://ts.nist.gov/WeightsAndMeasures/newletter/index.cfm. Past publications are available at http://ts.nist.gov/WeightsAndMeasures/newsletterarchive.cfm. The newsletter includes technical information and announcements in the area of legal metrology that are of interest to the weights and measures community. A list of articles related to commercial hydrogen measurement is provided for your covenience.
Hydrogen Meeting Schedule  Group: USNWG Day/Time: January 30, 2009/1:00 p.m. - 3:00 p.m. EST-USA & Canada (GMT -05:00) Place: Teleconference and Webconference ONLY Contact: juana.williams@nist.gov Group: USNWG Day/Time: February 24, 2009/1:00 p.m. - 3:00 p.m. EST-USA & Canada (GMT -05:00) Place: Teleconference and Webconference ONLY Contact: juana.williams@nist.gov Group: USNWG Device Standards Subcommittee Day/Time: April 28-29, 2009/8:30 a.m. - 5:00 p.m. EDT Place: TBA Contact: juana.williams@nist.gov Group: USNWG Subcommittee on Hydrogen Fuel Specifications Day/Time: April 30, 2009/8:30 a.m. - 12 noon EDT Place: TBA Contact: juana.williams@nist.gov Group: USNWG Device Standards Subcommittee Day/Time: August 18-19, 2009/8:30 a.m. - 5:00 p.m. EDT Place: TBA Contact: juana.williams@nist.gov Group: USNWG Subcommittee on Hydrogen Fuel Specifications Day/Time: August 20, 2009/8:30 a.m. - 12 noon EDT Place: TBA Contact: juana.williams@nist.gov Helpful Hydrogen Links  A list of web sites that provide some basic information on hydrogen refueling sites, safety, and production is provided for your convenience.
Current Hydrogen Events
Contacts for Commercial Hydrogen Measurement    For more information or if you would like to participate in the work to develop commercial hydrogen measurement standards in the following areas of legal metrology:
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