Hydrogen: U.S. National Work Group

The U.S. National Work Group (USNWG) for Hydrogen has accomplished its initial goal of developing a comprehensive set of standards for the commercial measurement of hydrogen. The USNWG continues to receive updates on NIST Handbook 44, OIML R 139, and has most recently provided input on NIST EPO 29 Hydrogen Gas Retail Vehicle Fuel Dispensers. 

What We Do

The Hydrogen U.S. National Work Group (USNWG) was formed in 2010 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 Hydrogen USNWG has accomplished its initial goals to develop a comprehensive set of standards for the commercial measurement of hydrogen as a vehicle fuel through two subcommittees: one that worked to refine equipment standards and test procedures simultaneously and the other that worked on fuel specification requirements. These standards are provided in the current editions of: 

• NIST Handbook 44 Section 3.39 Hydrogen Gas-Measuring Devices,  
• NIST Handbook 130 Section IV. B. Uniform Regulation for the Method of Sale of Commodities, Section 2.32 Retail Sales of Hydrogen Fuel (H), and 
• NIST Handbook 130 Section IV. F. Uniform Fuels and Automotive Lubricants Regulation, Section 2.20 Hydrogen Fuel. 

Of Further Interest

• National Hydrogen & Fuel Cell Day is on October 8 each year. The date of October 8 (10/08) was chosen in recognition of the atomic weight of hydrogen (1.008).
• Hydrogen Vehicle Fueling - FAQs 
• Development of International Standards
• Helpful Hydrogen Links & Contacts
• For more information including pressure conversions (current as of 2019), see document here: DOCX | PDF. 

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