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Physical Measurement Laboratory

Office of Weights and Measures

Hydrogen: U.S. National Work Group

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Hydrogen: USNWG

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 works to simultaneously refine equipment standards and test procedures and a second works on fuel specification requirements. For questions about meeting summaries and agendas please send a request to the USNWG Contact available through the Resources Helpful Hydrogen Links and Contacts listed below.
 

Next Meeting(s): TBD
USNWG Operating Guideline: USNWG HYDROGEN GUIDELINES 2-27-09
Meeting Summary(s): October 3-4, 2007, USNWG Meeting, Gaithersburg, MD
March 4-6, 2008, USNWG Meeting, West Sacramento, CA
June 17-19, 2008, USNWG Meeting, Des Plaines, IL
August 26-27, 2008, USNWG Meeting, Allentown, PA
December 2-4, 2008, USNWG Meeting, Boulder, CO
January 30, 2009, USNWG Meeting, Tele/Web Conference
February 24, 2009, USNWG Meeting, Tele/Web Conference
April 28-30, 2009 USNWG Meeting, West Sacramento, CA
June 17, 2009 USNWG Meeting, Tele/Web Conference
July 7, 2009 USNWG Meeting, Tele/Web Conference
August 11-13, 2009 USNWG Meeting, Gaithersburg, MD
"The Starting Point: A Discussion Paper Describing a Proposed Method of Sale and Quality Specification for Hydrogen Vehicle Fuel" (August, 2009)
December 15, 2009 USNWG, Tele/Web Conference
January 13, 2010 USNWG, Tele/Web Conference
April 27, 2010 USNWG, Tele/Web Conference
May 25, 2010 USNWG, Tele/Web Conference
June 17, 2010 USNWG, Tele/Web Conference
October 12, 2011, USNWG Meeting, Tele/Web Conference
Meeting Agenda(s): July 2, 2010 USNWG Meeting, Tele/Web Conference
April 19, 2011 USNWG Meeting, Tele/Web Conference
June 15, 2016 USNWG Meeting, Tele/Web Conference
Latest Code(s):

NIST Handbook 44:  Device Code Requirements for Hydrogen Vehicle Fueling
(Current Ed.)

  • 1.10. General Code DOCX | PDF
  • 3.39. Hydrogen Gas-Measuring Devices DOCX | PDF

NIST Handbook 130:  Method of Sale Regulation for Hydrogen Fuel
(Current Ed.)

IV. Uniform Regulations

  • B. Uniform Regulation for the Method of Sale of Commodities  PDF
    • 2.32. Retail Sales of Hydrogen Fuel (H)

NIST Handbook 130:  Standard Specifications for Hydrogen Fuel
(Current Ed.)

IV. Uniform Regulations

  • F. Uniform Fuels and Automotive Lubricants Regulation PDF
    • 2.20. Hydrogen Fuel

Of Interest

The National Conference on Weights and Measures (NCWM) met July 14-18, 2019 in Milwaukee, WI to hold its 104th Annual Meeting.  The proposal for upgrading NIST Handbook (HB) 44 Section 3.39 Hydrogen Gas-Measuring Devices – Tentative Code to permanent status (intended to be enforced) with several modifications was adopted.  The NIST Handbook 44 code is available above.

National Hydrogen & Fuel Cell Day is on Saturday, October 8, 2022..
The date of October 8 (10/08) was chosen in recognition of the atomic weight of hydrogen (1.008)

Image of Periodic element for Hydrogen with parts delineated

Resources

Weights and measures

Contacts

Created May 13, 2010, Updated March 28, 2022