International Standards Update
Karen Hall, National Hydrogen Association
The following is a brief update on the development of international standards for hydrogen technologies. These documents are all being developed under the ISO Technical Committee for Hydrogen Technologies (TC 197).
Reformer Efficiency
ISO/DIS 16110-2: Hydrogen generators using fuel processing technologies -- Part 2: Procedures to determine efficiency, is moving toward a Final Draft International Standard. ISO/TC 197 Working Group 9 will be meeting in Washington, DC on January 5-6, 2009. The main topic will be discussing DIS 16110-2 and the received comments/suggestions.
Hydrogen Detectors
The Draft International Standard ISO/DIS 26142: Hydrogen detector, is currently out for review and comment. Members of the US TAG are requested to provide input to CGA by January 9, 2009. There is a US TAG web conference on this topic scheduled on January 20 to agree on a US position.
This document provides:
- Certification criteria for hydrogen detection apparatus designed to detect hydrogen concentrations before a fraction of the flammable or explosive limit is reached, in order to allow for purging, shut-off, and similar safety operations.
- Requirements for stationary hydrogen detection apparatus, covering both performance requirements and test methods;
- Applicability only to detection apparatus that allow for continuous monitoring of hydrogen concentrations.
The document is primarily intended for hydrogen detection apparatus at vehicle refueling stations, where a high level of safety management is required (since it is the sector that has immediate need for this document and is expected to be the main application for such apparatus. Nevertheless, it may be applied to other stationary installations where the detection of hydrogen is required).
NHA members are invited to contribute to the NHA position on the US TAG. NHA members who would like to review this draft are requested to contact Karen Hall at hallk@hydrogenassociation.org to request a review draft no later than January 5, 2009.
Metal Hydrides
ISO 16111: Transportable gas storage devices — Hydrogen absorbed in reversible metal hydride, has been published. This International Standard describes the service conditions, design criteria, type tests, batch tests and routine tests for transportable hydride-based hydrogen storage systems, referred to as “metal hydride assemblies” (MH assemblies). Types of MH assemblies may serve as: fuel cell cartridges; hydrogen fuel storage containers; high-purity hydrogen supplies and others.
This International Standard defines the requirements for MH assemblies which utilize shells not exceeding 150 liters internal volume and have a maximum developed pressure (MDP) not exceeding 25 MPa. This International Standard only applies to refillable storage MH assemblies where hydrogen is the only transferred media. Storage MH assemblies intended to be used as fixed fuel storage onboard hydrogen fuelled vehicles are excluded. This standard is intended to be used for certification purposes.
The Standard can be purchased from ISO or national standards bodies, such as the Compressed Gas Association.
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