Citadel / all-metal aerospace platforms
Type I Aerospace Pressure Vessels
All-metal aluminum pressure-vessel platforms for aerospace systems where straightforward construction, corrosion resistance, packaging and program-specific interfaces matter.
- Aluminum pressure-retaining architecture
- Four aerospace platforms
- Program-specific interfaces

A Proven All-Metal Architecture.
Not every aerospace application requires a composite overwrap. Citadel provides an all-metal option for compatible pressure ranges and applications, with four platforms evaluated around volume, envelope, ports, mounting and qualification requirements.

Rampart
6-inch-class Type I platform
Compact all-metal architecture for gas accumulation, buffering, pneumatic and test applications.
Platform
6-inch class
Public aerospace rating
Confirm with engineering
Original black-coated aerospace hardware is shown. Commercial Atlas ratings are not transferred to Rampart.

Keep
10.5-inch Type I platform
A mid-diameter aerospace platform for applications needing greater volume while retaining an all-aluminum architecture.
Platform
10.5-inch class
Pressure, volume & ports
Confirm configuration

Sentry
2.2 L Type I platform
Small-volume pressure storage for compact aerospace gas-storage and pneumatic applications where a composite overwrap is not required.
Volume platform
2.2 L
Construction
All-metal aluminum

Fortress
15-inch Type I platform
A large-diameter platform for higher-volume accumulation, buffering, ground support or program-specific gas storage.
Platform
15-inch class
Specifications
Confirm configuration
Fortress test-fixture reference. Contact Steelhead for configuration details.
Compare the Starting Points.
Use the platform sizes to narrow the conversation. Final pressure, volume, port and qualification details are specific to the aerospace configuration.
| Platform | Size reference | Program starting point | Configuration review |
|---|---|---|---|
| Rampart | 6-inch class | Accumulation, buffering, pneumatic & test duties | Confirm aerospace pressure, volume and interfaces |
| Keep | 10.5-inch class | Mid-diameter all-metal gas storage | Confirm pressure, volume, ports and qualification |
| Sentry | 2.2 L | Compact gas storage & pneumatics | Confirm pressure and system interfaces |
| Fortress | 15-inch class | Higher-volume accumulation & program storage | Confirm exact configuration and requirements |
Vessel architecture
When Type I Makes Sense
Aluminum construction offers a straightforward pressure-retaining architecture for compatible aerospace applications. Vessel choice should account for the pressure range, thermal behavior, available envelope and inspection or integration requirements.
- All-metal pressure-retaining architecture
- Corrosion-resistant aluminum construction
- Straightforward inspection and integration
- Compatible lower-pressure accumulation and buffering duties
- Ports, valves and mounting reviewed around the application

Start with the requirement
Bring the Pressure, Envelope & Interface Requirements.
Steelhead can help evaluate the appropriate Type I platform and the engineering path for the aerospace configuration.