
Since long-term exposure to Hydrogen can embrittle existing pipelines and increase the potential for dangerous failures, researchers will be using hydraulic machines to test mechanical fatigue, residual strength and fracture toughness of various pipeline materials and equipment.
Some of the experiments will involve immersing pipeline materials in pressurized Hydrogen gas contained in steel alloy test chambers. NIST is coordinating its research and safety plans with other national laboratories and industry groups working with Hydrogen. In the future, the focus will expand to new pipeline materials such as composites.
http://www.sciencedaily.com/releases/2008/01/080124094006.htm