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Gimbal Expansion Joints
Gimbal Expansion Joints use a pair of hinge assemblies mounted to a common gimbal ring, allowing angular rotation in any plane while restraining pressure thrust. Deployed in pairs (or with a hinged unit), they absorb thermal growth across three-dimensional piping layouts with minimal anchor loads. Designed and manufactured by Athulya Bellows as per EJMA/ASME practices for reliable service in demanding applications.
Key Features
• Gimbal hardware (lugs, pins, arms, ring) restrains pressure thrust and shear forces.
• Permits angular movement in multiple planes; axial and lateral are restrained by design.
• Ideal for expansion loops and 3D piping where rotation must be controlled.
• Single or multi-ply bellows for improved flexibility and fatigue life.
• End connections: flanged or weld ends; drilling to ANSI/EN/IS or client spec.
• Optional internal flow liner for high-velocity/particulate service.
Applications
• Steam/hot air lines and process headers with fixed anchors and direction changes.
• Refineries, petrochemical & chemical plants—equipment tie-ins and manifolds.
• Power, steel & cement plants; district heating/cooling and HVAC mains.
• Large ducting/pipe systems needing angular rotation without axial thrust on anchors.
Technical Data (Typical Ranges)
| Parameter | Range | Notes |
|---|---|---|
| Nominal Size | DN 150 – DN 6000 | Custom diameters on request |
| Pressure Rating | Vacuum to high pressure | Gimbal hardware sized to restrain thrust |
| Temperature | −60°C to +1200°C | Material/service dependent |
| Movement Type | Angular (multi-plane via gimbal) | Axial & lateral restrained by design |
| Angular Movement | Project-specific (degrees per joint) | Function of bellows geometry & length |
| Materials | SS 304 / 316 / 321 / 310; special alloys | Hardware in CS/SS; coatings available |
| End Connections | Flanged / Welded | To client standard (ANSI/EN/IS, etc.) |
| Accessories | Gimbal assemblies, limit rods, internal liners, covers | Preset / cold-spring options available |
Design Options
• Multi-ply bellows for higher flexibility & fatigue life.
• Gimbal arms with clevis or spherical ends; removable hinge pins.
• Internal flow liners, external protective covers, insulation jackets.
• Surface protection for CS parts (paint, zinc, or client-specified).
• Factory preset / cold-spring to optimize installed angles.
Quality & Testing
• Designed and manufactured as per EJMA/ASME practices.
• Hydrostatic / pneumatic pressure testing of each assembly.
• Optional NDT: dye-penetrant, helium leak, and cycle testing.
• Full material traceability with certificates on request.
Prefer a quick review? Email your specs to sales@athulyabellows.com.