USNWG COMMERCIAL H2 MEASMT STANDARDS – 2011 APR MTG AGENDA

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U.S. National Work Group 

for the

Development of Commercial Hydrogen Measurement Standards

April 19, 2011

Joint Device Standards Subcommittee (DSS) and Fuel Specifications Subcommittee (FSS)

Tele/Web Conference Meeting

AGENDA

Time: Tuesday, April 19, 2011/3:00 p.m. – 4:30 p.m. EDT-USA & Canada (GMT - 05:00)

Meeting Name: H2 USNWG April 19, 2011 Web/Teleconference Meeting

NOTE: Please log into the web site first. On the attendee list click on the telephone icon and have the system 

call your telephone number. If that process does not work dial the number and enter the pass code listed below.

To join the meeting online: http://nist.adobeconnect.com/h2usnwgmtgapr19/

Call-In Telephone Number: 1-877-685-5350

Call-In Password: 908127

Audio Conference Only: *6 to MUTE or UNMUTE

This meeting is sponsored by the U.S. Department of Energy and U.S. Department of Commerce's National 

Institute of Standards and Technology.

Purpose: The U.S. National Work Group (USNWG) is meeting to continue its work to promote the 

establishment of a comprehensive set of (1) design, accuracy, installation, use, and method of sale requirements, 

(2) test procedures, and (3) quality standards for hydrogen fuel and equipment used in hydrogen measurements for 

vehicle and other refueling applications. 

ATTACHMENTS:

Appendix A Summary of the July 2010 USNWG Meeting (Under Development)

Appendix B Draft (revision 4) Examination Procedure Outline (EPO) 29 for Hydrogen Gas (H2Gas) Retail 

Vehicle Fuel Dispensers

Appendix C Guidelines for Gravimetrically Testing Gaseous Hydrogen Dispensers (revision 7)
USNWG COMMERCIAL H2 MEASMT STANDARDS – 2011 APR MTG AGENDA

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Glossary of Acronyms

ASTM American Society of Testing and 

Materials International

MPa megapascal

CaFCP California Fuel Cell Partnership NCWM National Conference on Weights and 

Measures

CDFA 

DMS 

(also CA

DMS)

California Department of Food and 

Agriculture, Division of Measurement 

Standards

NGV Natural Gas Vehicle

DSS Device Standards Subcommittee NIST National Institute of Standards and 

Technology

EPO 29 Draft (revision 4) Examination 

Procedure Outline (EPO) 29 for

Hydrogen Gas (H2Gas) Retail Vehicle 

Fuel Dispensers 

NTP Normal Temperature and Pressure

FCHEA Fuel Cell and Hydrogen Energy 

Association

OEM Original Equipment Manufacturer

FSS Fuel Specifications Subcommittee OIML International Organization of Legal 

Metrology

HB 44 NIST Handbook 44 Specifications, 

Tolerances, and Other Technical 

Requirements for Weighing and 

Measuring Devices (2011)

OIML R 

139

Recommendation for Compressed 

gaseous fuel measuring systems for 

vehicles

HB 130 NIST Handbook 130 Uniform Laws 

and Regulations in the Area of Legal 

Metrology and Engine Fuel Quality 

(2011)

RMFD Retail Motor-Fuel Dispenser

HGV Hydrogen Gas Vehicle S&T Specifications and Tolerances

ISO International Organization for 

Standardization 

SAE Society of Automotive Engineers

MMQ Minimum Measured Quantity SI International System of Units

MOS Method of Sale USNWG U.S. National Work Group

L&R Laws and Regulations

This table is meant to assist the reader in the identification of acronyms used in this agenda and does not 

imply that these terms are used solely to identify these organizations or technical topics. 
USNWG COMMERCIAL H2 MEASMT STANDARDS – 2011 APR MTG AGENDA

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AGENDA TOPICS

3:00 P.M. (EDT) 

(1) Welcome and Roll Call

New members of the USNWG and visitors will be welcomed, the meeting will be called to order, time allotted for 

roll call, and the meeting's purpose will be reviewed. The collaborative work by the meeting's sponsors will be 

recognized. New participants will be invited to provide their name, affiliation, and state their specific area of 

interest in the work to develop hydrogen measurement standards.

(2) Administrative Business

The USNWG will discuss and decide on procedures for managing and documenting its technical work. The 

following item(s) will be addressed:

(a) Approve the Summary of the July 2, 2010 USNWG Meeting 

A draft summary (Appendix A-under development) of the July 2, 2010 tele/web conference meeting was not 

distributed to the work group for its review and approval. However, the USNWG received an abbreviated 

summary on July 9, 2010. Subsequent updates on the outcome of the July 2010 NCWM vote to approve the 

hydrogen device and method of sale codes were distributed to the USNWG and posted on the NIST WMD 

Hydrogen web site available at: http://www.nist.gov/pml/wmd/lmdg/hydrogen.cfm. A summary of the July 2nd

meeting and the July 9, 2010 abbreviated summary will be developed and available on or before April 19, 2011. 

The USNWG will discuss the best strategy to allow sufficient time for a review of the July 2010 summary. 

(b) Agenda Updates for April 2011

Items will be added to the agenda in order of urgency and discussed as time permits. Topics requiring lengthy 

discussion or research may be carried over to the next scheduled USNWG meeting.

(3) Opportunity for Reports on Related Activities

The USNWG is working to harmonize, wherever possible, with related standards to encourage uniformity and to 

avoid contradictory requirements and trade barriers for U.S. industry. The USNWG Subcommittees will receive 

updates on work by organizations such as ASTM, CaFCP, DMS, FCHEA, OIML, SAE and other related activities

as their work continues to progress. 

(4) Development of Device Standards and Test Procedures for Commercial Hydrogen Measurement

(a) Device Type Evaluation Criteria

On March 23, and April 7, 2011, the NCWM National Type Evaluation Technical Committee-Measuring Sector 

Subgroup met to review the draft Hydrogen Gas-Measuring Devices Checklist developed in January 2011 by the 

California’s Division of Measurement Standards. The checklist includes general criteria for (1) the design of the 

measuring, indicating, and recording elements, (2) operation of the discharge components and systems that are 

card or cash activated, and (3) marking requirements. The Subgroup has tentative plans for meeting the third or 

fourth week of April. The next step will be for the Subgroup to distribute an updated draft checklist to the 

USNWG for its review and comments. The USNWG should consider a tele/web conference meeting in early 

August 2011 to try to reach a consensus on the final draft of the NCWM NTEP hydrogen dispenser type 

evaluation checklist. The Subgroup plans to submit a final draft of the checklist to the Measuring Sector for its 

approval in late September/early October 2011. 
USNWG COMMERCIAL H2 MEASMT STANDARDS – 2011 APR MTG AGENDA

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NOTE: The NIST Handbook 44 Section 1.10 General Code and Section 3.39 Hydrogen Gas Measuring DevicesTentative Code are the basis for: (1) Type Evaluation Criteria used to conduct evaluations on a device before that 

device can receive approval for commercial use and (2) Field Inspection and Test Procedures used by regulatory 

officials in their day-to-day evaluation of devices in commercial use to determine if a device meets design, 

operation, and performance requirements. NIST Handbook 44 is available on the NIST WMD web site at: 

http://www.nist.gov/pml/wmd/pubs/h44-11.cfm.

(b) Test Procedures

A key objective for the April 2011 USNWG meeting will be to ensure we have identified all viable test 

procedures and provide input on test methods not previously identified that can be used to determine the 

performance of a retail hydrogen gas fuel dispenser. The ultimate goal will be to develop outlines of examination 

procedures for all three tests (gravimetric, volumetric, and mast meter) recognized in NIST Handbook 44 Section 

3.39 paragraph N.4.Tests. Attached to the meeting agenda are the current Draft (revision 4) Examination 

Procedure Outline (EPO) 29 for Hydrogen Gas (H2Gas) Retail Vehicle Fuel Dispensers (see Appendix B) and the 

corresponding Guidelines for Gravimetrically Testing Gaseous Hydrogen Dispensers (revision 7) (see Appendix 

C) for the USNWG’s review. Marc Buttler, NIST Technical Advisor to the Fuel Specifications Subcommittee,

will lead efforts on the development of EPOs for the volumetric and master meter test methods and seek input 

from regulatory agencies, the private sector, laboratories, and academia on the various test methods.

(5) Next Meeting

The USNWG member are asked to review their calendars in preparation for a possible tele/web conference 

meeting in early August 2011 to discuss the final draft of the NCWM NTEP hydrogen dispenser type evaluation 

checklist.

In addition to the development of test procedures, the USNWG should consider prioritizing work on any 

remaining projects such as (1) the hydrogen fuel quality standard, (2) addressing wholesale applications, other 

methodologies in use for gas measurement, and liquid hydrogen dispensers, and (3) defining terminology e.g., 

“discontinuous adjusting means.” 

4:30 P.M. (ET) Meeting Adjourns