Commercial Pressure Vessels
CNG Cylinders
Lightweight Type III composite cylinders for compressed natural gas storage in automotive, industrial-vehicle and mobile applications.
Steelhead CNG cylinders combine 6061-T6 aluminum liners with composite reinforcement to reduce system weight while providing robust, gas-tight high-pressure storage at 3,600 PSI.
High-pressure CNG storage
Lightweight cylinders for demanding on-vehicle applications.
Steelhead's Type III CNG cylinders are designed for systems where vehicle weight, packaging, durability and certified high-pressure storage performance are critical.
The CNG portfolio includes Nomad Series — Nomad Tide for compact installations, Transit Series — Liberty in the 11-inch platform, and Transit Series — Freedom in the 16-inch platform.
3,600 PSI
250 bar operating pressure for certified CNG storage.
Type III
Metallic liner with full composite overwrap.
FMVSS 304 + NGV2:2023
Current CNG product-family certifications.
CNG product families
Three CNG platforms for different vehicle and storage envelopes.
Steelhead's CNG portfolio includes compact and high-capacity Type III platforms for vehicle, vessel, fleet and specialty compressed-natural-gas applications.
Transit Series
Liberty
11-Inch OD Type III CNG Cylinder
Lightweight on-vehicle CNG storage using Steelhead's 280 mm (11 in) diameter Type III platform.
- 30–120 L documented water-volume range
- 250 bar / 3,600 PSI operating pressure
- 280 mm / 11 in outside diameter
- Dual 1-1/8-12 ports
- Strap mounting
- Lyra and Oasis valve options
Transit Series
Freedom
16-Inch OD Type III CNG Cylinder
High-capacity CNG storage for transit, commercial-vehicle and fleet applications requiring larger onboard fuel volumes.
- 90–270 L water-volume range
- 250 bar / 3,600 PSI operating pressure
- 414 mm / 16.3 in outside diameter
- Dual 1-1/8-12 ports
- Strap mounting
- NGV2:2023 & DOT FMVSS 304
Nomad Series
Nomad Tide
Compact 6.8-Inch OD CNG Cylinder
Compact Type III CNG platform for vehicle and vessel installations where available space and system weight are tightly constrained.
- 8 L and 10 L standard configurations
- 6.8 in / 172.7 mm outside diameter
- 3,600 PSI CNG family
- Sherwood CNG valve + plugged second port
Transit Series — Liberty
Liberty: 30 to 120 liters on a common 11-inch platform.
Transit Series Liberty uses Steelhead's 280 mm (11 in) diameter Type III platform for lightweight high-pressure CNG storage in automotive, transit and industrial vehicle systems.
Transit Series — Freedom
Freedom: high-capacity 16-inch Type III CNG storage.
Transit Series Freedom is Steelhead's 16-inch OD Type III CNG platform for transit, commercial-vehicle and fleet applications requiring larger onboard storage volumes.
- Dual 1-1/8-12 ports
- OMB Lyra CV CNG Valve and PRD, Oasis, and VTI TPRD options; inquire for others
- NGV2:2023 & DOT FMVSS 304 certifications
- Custom lengths available by inquiry
| Water Volume | Mass (lbs) | Mass (kg) | OAL (in) without valve | OAL (mm) without valve |
|---|---|---|---|---|
| 205 Liter | 203 | 447 | 82 | 2090 |
| 270 Liter | 292 | 642 | 102 | 2578 |
Nomad Series — Nomad Tide
Nomad Tide: two compact configurations for constrained installations.
Nomad Tide is the compact 6.8-inch OD CNG platform, available in 8-liter and 10-liter configurations.
| Nominal Volume | Length Without Valve | Length With Valve | Mass Without Valve | Outside Diameter |
|---|---|---|---|---|
| 8 L (2.1 gal) | 652 mm (25.6 in) | 704 mm (27.7 in) | 8.5 kg (18.7 lb) | 172.7 mm (6.8 in) |
| 10 L (2.6 gal) | 741 mm (29.1 in) | 792 mm (31.2 in) | 9.0 kg (20.0 lb) | 172.7 mm (6.8 in) |
CNG cylinder technology
Type III composite cylinder architecture.
Lightweight construction without compromising high-pressure gas containment.
Across Transit Liberty, Transit Freedom and Nomad Tide, Steelhead Type III CNG cylinders combine a metallic liner with composite reinforcement to reduce system weight while providing durable, gas-tight storage for demanding vehicle applications.
Metallic Liner
Provides the gas-retaining barrier at the core of the Type III vessel architecture.
Composite Reinforcement
Engineered composite overwrap carries structural loads while reducing vessel mass.
Engineered for Durability
Vessel architecture is designed around demanding high-pressure service, durability and vehicle integration requirements.
Construction & safety
Built for safe, gas-tight CNG storage in demanding environments.
6061-T6 Aluminum Liner
Metallic liner provides the gas-retaining barrier in the Type III construction.
Composite Overwrap
Full composite reinforcement reduces weight compared with conventional all-metal CNG cylinders.
Thermal Pressure Relief
CNG valve configurations incorporate thermally activated pressure-relief capability.
Applications
CNG storage for vehicles, transit fleets and mobile systems.
Steelhead CNG cylinders can be integrated as a single vessel or as part of a bundled on-vehicle storage system.
Commercial Vehicles
CNG storage for fleet and commercial vehicle applications.
Transit & Industrial Vehicles
High-pressure CNG storage for transit, industrial and specialty-vehicle platforms.
Compact Mobile Systems
6.8-inch OD storage where packaging space is especially limited.
Vehicle / Vessel Integration
Compact CNG configurations can support vehicle or vessel gas-storage installations.
Engineering support
Configure CNG storage around the vehicle.
Steelhead can help evaluate storage volume, cylinder diameter, port configuration, mounting and system packaging for CNG applications.
Volume Selection
Match storage capacity to vehicle range and available installation space.
Valve Integration
Review valve, plug and pressure-relief-device requirements.
Mounting & Packaging
Evaluate single-cylinder or bundled layouts and strap-mount integration.
Talk to a pressure vessel expert
Which CNG cylinder platform fits your vehicle?
Share your required capacity, installation envelope, valve and mounting requirements with Steelhead.