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.
- All-metal aluminum
- Four aerospace platforms
- Fully demisable
The Citadel family
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
A modular smallsat platform for propulsion, pneumatic and test applications, with a two-port architecture and expandable lengths.
Platform
6-inch class
Configurable volume
5 L to 32 L
Aerospace rating
S-080 heritage
Commercial Atlas ratings are not transferred to Rampart.
Keep
10.5-inch Type I platform
A mid-volume aerospace storage platform that balances greater capacity, packaging and mission-flexible configuration in an all-aluminum architecture.
Platform
10.5-inch class
Configurable volume
20 L to 100 L
Aerospace rating
S-080 heritage (pending)
Sentry
2.2 L Type I platform
A compact subsystem solution for small-volume gas storage and pneumatics, with fixed-length simplicity and a minimal envelope.
Volume
2.2 L
Other volumes
On request
Construction
All-metal aluminum
Aerospace rating
S-080 heritage
Fortress
15-inch Type I platform
A high-capacity platform for higher-volume accumulation, buffering, ground support and program-specific storage, with scalable architectures.
Platform
15-inch class
Configurable volume
70 L to 270 L
Aerospace rating
S-080 heritage
AI-enhanced Fortress test-fixture reference. Contact Steelhead for configuration details.
Platform comparison
Find the Starting Point for Your Mission
Use the platform sizes to narrow the conversation. Final pressure, volume, port and qualification details are specific to the aerospace configuration.
| Platform | Size Reference | Positioning | Key Benefits |
|---|---|---|---|
| Rampart | 6-inch class | Modular smallsat workhorse | Two-port architecture, expandable lengths, fully demisable design |
| Keep | 10.5-inch class | Mid-volume storage platform | Higher storage capacity, mission-flexible configuration, fully demisable |
| Sentry | 2.2 L | Compact subsystem solution | Fixed-length simplicity, minimal envelope, fully demisable |
| Fortress | 15-inch class | High-capacity mission storage | Maximum volume efficiency, scalable architectures, fully demisable |
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
- Fully demisable
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.