From: National Institute of Standards and Technology (NIST) <subscriptions@nist.gov>
Date: Mon, Jul 21, 2014 at 9:39 AM
Subject: Fill er Up: NIST Develops Prototype Meter Test for Hydrogen Refueling Stations
To: iammejtm@gmail.com
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| NIST's Jodie Pope and her team have developed this prototype field test standard to test the accuracy of hydrogen fuel dispensers. Credit: Suplee/NIST |
To support the fair sale of gaseous hydrogen as a vehicle fuel, researchers at the National Institute of Standards and Technology (NIST) have developed a prototype field test standard to test the accuracy of hydrogen fuel dispensers.* Once the standard is field tested, it will serve as a model for constructing similar devices for state weights and measures inspectors to use.
Three automakers plan to begin selling hydrogen-fueled vehicles to consumers in 2015. The state of California has opened nine refueling stations and is funding the construction of an additional 28 hydrogen stations during the next few years to service the growing number of hydrogen fuel cell vehicles on their roads.
NIST Handbook 44, the bedrock reference text for weights and measures inspectors, includes specifications, tolerances and other requirements for commercial weighing and measuring equipment ranging from gasoline dispensers to grocery store scales. Handbook 44, which has been adopted by all states, stipulates that hydrogen will be sold by the kilogram, and according to Juana Williams, a NIST weights and measures expert, hydrogen-dispensing pumps must be accurate to within 2 percent, or 20 grams, per kilogram.
"It's much more difficult to measure hydrogen gas delivered at 5,000 to 10,000 psi than it is to measure a product that is a liquid at atmospheric temperatures and pressures," says Williams. "While a kilogram of hydrogen has approximately the same energy content as a gallon of gasoline, the allowable error is slightly less stringent than for gasoline."
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Jeremy Tobias Matthews
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