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 OWM 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.

A first committee draft (1 CD) of R 81 "Dynamic Measuring Devices and Systems for Cryogenic Liquids" is under development. The 1 CD is scheduled for distribution in July 2012 to national stakeholders and Technical Committee 8/Subcommittee 6 for their review and comments.

R 139
"Compressed Gaseous Fuel Measuring Systems for Vehicles" (2007)

R 139 Status: In May 2012, the Secretariat (the Netherlands) for International Organization of Legal Metrology (OIML) Recommendation 139 (R 139) "Compressed Gaseous Fuel Measuring Systems for Vehicles" distributed the first committee draft (CD) of the international standard for review. The document is the OIML model regulation for equipment used to deliver compressed gases (natural gas, hydrogen, etc.) as fuel into motor and fuel cell vehicles, small boats, and aircraft.

The 1 CD of R 139 includes parts (1) metrological and technical requirements and (2) metrological controls and performance tests.

NIST OWM will distribute the draft on June 8, 2012 for input from national stakeholders so that a U.S. position can be developed on the draft document. Comments will be due by July 9, 2012.

For copies of the latest drafts of R 81 or R 139, click here: http://www.oiml.org.

By selecting these links, you will be leaving NIST webspace. We have provided these links to other web sites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other web sites that are more appropriate for your purpose. NIST does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, NIST does not endorse any commercial products that may be mentioned on these sites. Please address comments about this page to TheSI@nist.gov