PRESS RELEASE: ASME certification obtained for new hydrogen storage cylinder



Cylinder to be tested in Mojave Desert

Pictured is WireTough’s 350 bar cylinder designed under a DOE program being prepared for testing.

Dateline: [Bristol, VA.]: WireTough Cylinders, LLC has obtained the U3 Certification stamp under The American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code Section VIII-Div 3 for its Type II-S cylinder design for bulk storage of gaseous hydrogen at a pressure of 350 bar. WireTough Cylinders is at the forefront of a technological revolution that is set to transform the world of energy storage using its Type II-S cylinders. It pioneered the design and advanced manufacturing techniques for its patented steel wire-wrapped pressure vessels. These vessels are cost-effective and exhibit high durability and fatigue resistance under service conditions of deep pressure cycles. They are engineered to securely store 40.7 kilograms of hydrogen at a maximum operating pressure of 350 bar. In an era where clean energy, energy efficiency, and cost-effectiveness are paramount, WireTough’s mission is to lead the charge in providing cutting-edge solutions for on-ground, long-duration energy storage enabling the following critical applications:

  • Storage of excess energy generated during peak generation periods in renewable, fossil fuel, and nuclear energy power plants, paving the way for a more efficient and reliable energy grid.
  • Bulk storage of hydrogen for refueling trucks, passenger cars, off-road vehicles, ships, trains, and forklifts, propelling the green transportation revolution forward.

These vessels are 50% lighter, expected to be significantly more cost-effective, and require considerably less space on the basis of per KG of hydrogen stored. Below is a more detailed look at the design specifications for WireTough’s new hydrogen cylinder.




Max Operating Pressure Design Pressure  







Cylinder Weight


Water Capacity


Weight of H2 stored at 350 bar
bar psi bar psi mm in mm ft KG Lbs. Liters Cu ft KG Lbs.
350 5075 500 7250 647 25.5 7600 25 3675 8095 1715 59 40.7 90

The U.S. DOE has recently announced plans for creating seven regional hubs within the US for generating three million metric tons of hydrogen annually by the year 2030. If only 0.1% percent of this capacity is saved onsite in storage facilities, it will require thousands of such tanks over five years. WireTough has been selected to submit a full proposal for the award of the MAKE IT Prize of $5M to manufacture these cylinders. WireTough invites partners to commercialize this technology on a large scale and can be contacted via email or its website.

WireTough can be contacted via email at [email protected] or [email protected]. Learn more about WireTough Cylinders at

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