Reliance Series
Large Type III Pressure Vessels
High-capacity composite pressure vessels for mobile gas transport, ground storage, life-support, defense and industrial systems where dependable high-pressure storage matters.
Reliance combines aluminum-lined Type III construction with Steelhead's flexible port architecture across three product families spanning 5,000 to 6,000 PSI and applications from single-vessel installations to bundles, MEGCs and stationary storage systems.
Large-volume composite gas storage
Three Type III families for mission-critical gas storage.
Reliance COPVs are engineered for applications where dependable gas storage is critical, from breathing air and life-support systems to mobile transport, industrial gas, aerospace support and military applications.
Lightweight composite construction maximizes gas capacity while reducing system mass. Steelhead's port architecture supports flexible valve, TPRD and connection integration, allowing the vessel and system configuration to be matched to the application.
Type III
Aluminum-lined composite pressure-vessel construction.
5,000–6,000 PSI
High-pressure platforms across the Reliance product families.
20 L–270 L
Capacity coverage across three product families, including smaller configurations available by application.
Reliance Series products
Large Type III platforms for transport, storage and mission support.
Three product families provide different diameter, pressure, volume and port architectures while retaining the weight advantages of aluminum-lined composite construction.
Reliance Series
Reliance Pathfinder
17-Inch OD · 5,000 PSI Type III COPVs
Steelhead's large-port gas-transport platform for mobile transport, bundles, MEGCs, tank farms and buffer-storage systems.
- 345 bar / 5,000 PSI operating pressure
- 17-inch nominal OD
- 90–270 L standard documented capacities
- Large-port and flexible valve/end-plug integration
Reliance Series
Reliance Guardian
13-Inch-Class · 5,000 PSI Type III COPVs
A mid-diameter Type III platform for applications requiring high-pressure storage in a more compact envelope than the Pathfinder family.
- 5,000 PSI operating pressure
- 6061 aluminum liner
- Carbon-composite structural shell
- Symmetric-port architecture on documented configuration
Reliance Series
Reliance Summit
11.8-Inch OD · 6,000 PSI Type III COPVs
Higher-pressure bossless Type III platform for demanding gas-storage systems where pressure, package diameter and system integration drive vessel selection.
- 414 bar / 6,000 PSI operating pressure
- 11.8-inch nominal OD
- 75 L and 114 L documented configurations
- Smaller sizes available by application
Reliance Pathfinder
17-inch OD, 5,000 PSI gas-transport platform.
Pathfinder is the large-capacity Reliance platform for mobile gas transport, bundled systems, MEGCs, ground storage, tank farms and buffer applications.
The family combines Type III construction with Steelhead's large-port architecture and flexible valve or end-plug integration for demanding high-flow gas systems.
Pathfinder vessel configurations
Five documented standard capacities use the common 17-inch nominal outside diameter.
| Nominal Volume | Length Without Valves | Mass / Weight | Outside Diameter | Operating Pressure |
|---|---|---|---|---|
| 90 L | 1029 mm (41 in) | 68 kg (150 lb) | 432 mm (17 in) | 345 bar (5,000 PSI) |
| 133 L | 1435 mm (57 in) | 95 kg (210 lb) | 432 mm (17 in) | 345 bar (5,000 PSI) |
| 205 L | 2146 mm (85 in) | 140 kg (310 lb) | 432 mm (17 in) | 345 bar (5,000 PSI) |
| 260 L | 2550 mm (100 in) | 168 kg (370 lb) | 432 mm (17 in) | 345 bar (5,000 PSI) |
| 270 L | 2642 mm (104 in) | 170 kg (375 lb) | 432 mm (17 in) | 345 bar (5,000 PSI) |
Pathfinder system integration
Large-capacity storage with flexible installation and port architecture.
Pathfinder is designed to integrate into very different system architectures, from compact vertical installations to bundled and multi-port gas-storage systems.
Compact vertical integration
Reliance Pathfinder integrated into a compact hydrogen fuel cell system, demonstrating the platform's ability to deliver high-capacity gas storage in a space-constrained installation.
Extensive valve, TPRD and porting flexibility
Extensive valve, TPRD and porting options allow Pathfinder vessels to integrate easily into a wide range of mobile, stationary and bundled gas-storage applications.
Reliance Guardian
Mid-diameter 5,000 PSI Type III storage.
Guardian provides a more compact diameter than Pathfinder while retaining high-pressure Type III performance for transport, storage and mission-support applications.
The current AG50CL089A10A10 drawing is preliminary; additional Guardian configurations are available or under development.
Guardian production details
Type III construction engineered for compact, high-pressure systems.
Production views of Reliance Guardian vessels show the carbon-composite structure, compact end geometry and port configuration of the 5,000 PSI platform.
Reliance Summit
11.8-inch OD Type III storage at 6,000 PSI.
Summit extends Reliance to 414 bar / 6,000 PSI in a narrower 11.8-inch nominal diameter for demanding systems where package diameter and pressure are both critical.
The current product-family drawing documents 75-liter and 114-liter configurations with 1-1/2-12 UN-2B port interfaces and specified valve / TPRD hardware.
Summit documented configurations
| Nominal Volume | Dimension A | Overall Length / Dimension B | Mass Without Valves | Certification Note |
|---|---|---|---|---|
| 75 L (19.8 gal) | ~66.1 in / ~1679 mm | ~73.4 in / ~1864 mm | ~132 lb / ~60 kg | Pending on current drawing |
| 114 L (30.1 gal) | ~96.5 in / ~2451 mm | ~103.8 in / ~2637 mm | ~194 lb / ~88 kg | Pending on current drawing |
Operating envelope
High-pressure capability without special-permit dependence.
5,000–6,000 PSI
Reliance spans 345 bar / 5,000 PSI and 414 bar / 6,000 PSI operating-pressure platforms.
Cycle Tested
Product validation includes cycling to 125% of maximum developed pressure where applicable to the qualified configuration.
Ready for Demanding Environments
Documented 5,000 PSI platform operating range is -22°F to 150°F, with short-duration excursions up to 185°F.
Retesting
Product/service programs support retesting in accordance with applicable ISO 11623 requirements.
Ports & mounting
Steelhead port architecture for flexible system integration.
Steelhead's patented architecture enables flexible multi-port integration for valves, TPRDs, engineering plugs and application-specific system interfaces.
Flexible Connections
Multiple adapter configurations can accommodate application-specific thread standards and system requirements.
Port Options
Valve, TPRD, engineering-plug, ORB and custom-thread configurations are available across applicable Reliance platforms.
Mounting
Designed for straightforward strap or saddle mounting in horizontal or vertical system architectures.
Applications
Dependable gas storage across transport, life-support, industrial and mission systems.
Breathing Air & Life Support
Bulk breathing-air storage for emergency response, diving and life-support systems.
Mobile Gas Transport
Lightweight transport modules, trailers, bundles and MEGC systems.
Tank Farms
High-capacity storage, cascade banks and gas-buffering applications.
Aerospace & Defense Support
Gas storage for ground support, test, launch and operational systems.
Industrial Gas Supply
Hydrogen, nitrogen, helium, argon, oxygen and compatible specialty-gas systems.
Military & Tactical Support
Rugged gas-storage platforms for deployed and mission-critical applications.
Engineering support
Configure Reliance around your mission.
Reliance COPVs are engineered for applications where dependable gas storage is critical, from breathing air and life-support systems to military and tactical support equipment.
Lightweight composite construction maximizes gas capacity while delivering the durability and reliability demanded by mission-critical operations. Steelhead's port architecture enables flexible porting, valve integration and mounting configurations so the vessel and system can be tailored to the requirements of the application.
Have a specific pressure, capacity, port or packaging requirement? Talk with a Steelhead engineer
Start a Reliance pressure-vessel conversation
Which Reliance platform fits your gas-storage system?
Share your gas, pressure, volume, port, mounting and packaging requirements with Steelhead's engineering team.