931 Bar High-Pressure Tube Trailers for Hydrogen Delivery

New cylinder technology for 931 bar high-pressure hydrogen tube trailers operates under a unique permit issued by the U.S. Department of Transport for use on roads.

While OneH2 has been operating fleets of 520-bar (7,500 psig) hydrogen transport trailers for materials handling applications, this new 931-bar (13,500 psig) design allows for direct fills of higher-pressure, 700-bar (10,000 psig) automotive, and heavy vehicle applications, making hydrogen-fueled transport much more economical.

By transporting hydrogen gas at higher pressures, OneH2 bypasses the extra processing normally required by delivery methods such as lower-pressure gaseous transport, which requires further compression at the point of use; and in the case of liquid hydrogen, post-delivery processing often includes several stages of vaporization and compression before the hydrogen is usable as a transport fuel. All these processes add cost and time and can impact reliability. When factored into the price of the fuel, this can be significant, especially at scale.

This system design will help to store larger quantities of gaseous hydrogen for transportation, avoiding any use of onboard compression on the trailer or compression systems at the retail point of use.

931 bar trailers consist of various combinations of high-pressure cylinders packaged together. Each cylinder can hold up to 60 lb. (27 kg) (gross) of gaseous hydrogen at 931 bar (13,500 psig) pressure, which is close to 3x that of the cylinder technology OneH2 previously used.

Trailers can be configured with various capacities. With a maximum configuration of up to 18 cylinders, a single trailer can hold up to 1,100 lb. (486 kg) of automotive, fuel-cell grade, hydrogen. If on-site space is an issue, OneH2 offers smaller trailer configurations (down to 6 cylinders, 350 lb. [160 kg]) promoting better maneuverability in tighter environments.

To ensure maximum use of onboard hydrogen, OneH2 uses a patented cascading function, allowing each cylinder to act as its own cascading bank. Cascading is a method of intelligently drawing from different cylinders, to refuel the vehicles in such a way that the remaining inaccessible hydrogen gas in storage cylinders is kept to a minimum.

The trailer also includes key features that optimize performance and safety, such as onboard hydrogen gas sensors, on-tank actuator valves for isolation, telemetry to report the status of the trailer on-road, safety interlocks, and a temperature and pressure relief device (TPRD) for each tank. 

The trailer’s cylinders are designed and tested in accordance with international standards that provide specifications for the design, construction, and testing of type IV composite cylinders. 

OneH2 also offers 931 bar Mobile Fuelers using the same cylinder technology. The refueler includes an onboarded dispensing system for both 350 bar (5,000 psig) and 700 bar (10,000 psig) pressure, turning the trailer into a portable fueling station.

This mobile and portable refueling station allows customers to receive hydrogen at any location and immediately refuel vehicles, with minimal to no investment in on-site equipment and reducing permitting and construction headaches. 


  • Delivered ready to use—no additional compression or processing needed
  • Decrease waste and storage expenses
  • Convenient fuel portability and a compact storage footprint
  • Intended to be interconnected to hydrogen dispensers (350 or 700 bar [5,000 or 10,000 psig])
  • Operate under DOT permit SP 21259
  • Operate with 930 bar (13,500 psig) max working pressure
  • Hydrogen gas detector on board each carrier
  • Status LED light on the side of the carriers with a red push button for E-stop operation
  • DOT-certified frame & cylinders for compressed GH2 application at 930 bar (13,500 psig) with a TPRD on each cylinder per ASME B31.3
  • Interconnection piping rated to 20,000 psi (1,400 bar) per ASME B31.1
  • Pressure transducers and flow meter to monitor excess pressure and flow
Trailer Specifications 160 kg (350 lb.) 320 kg (700 lb.) 480 kg (1,050 lb.)
Carriers 2 4 6
Gas Cylinders 6 12 18
Dimensions (L x W x H) 30 x 6.8 x 6.6 ft
(9 x 2 x 2 m)
30 x 6.8 x 9.1 ft
(9 x 2 x 3 m)
53 x 8.6 x 10 ft
(16 x 3 x 3 m)
Weight 22,000 lb. (10,000 kg) 43,000 lb. (19,500 kg) 59,000 lb. (27,000 kg)
Tow Vehicle Class 3 to 7 5 to 7 8

Longview, NC
(844) 996-6342
[email protected]

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