Expansion joints, metallic and non.
Bellows that absorb thermal growth, vibration, and misalignment — engineered per EJMA, fabricated with the metallurgy your service needs, qualified by analysis and testing.
- Standard
- EJMA 10th Ed. + ASME B31.3
- Size range
- DN 25 – DN 4,000
- Temperature
- -196 °C to +1,100 °C
- Pressure
- vacuum to 40 barg
- Types
- Single, Universal, Hinged, Gimbal, Pressure-Balanced, Tied
- Bellows materials
- SS321, SS316L, Inconel 625, Incoloy 800H, Hastelloy
What we build.
Single
Axial movement only; the baseline bellows element.
Universal Tied
Two bellows + tie rods; lateral and angular movement.
Hinged
Single-plane angular movement only.
Gimbal
Angular movement in any plane.
Pressure-Balanced Elbow
Cancels pressure thrust at direction change.
In-Line Pressure-Balanced
Pressure thrust cancellation on straight runs.
Fabric (flue gas)
Multi-layer fabric for power-plant ducting and stacks.
Rubber (slurry, water)
EPDM / NBR / Neoprene bellows for pumps and pipelines.
Refractory-Lined (FCCU)
Internally lined joints for hot catalyst service.
Materials & service
- High-temp Incoloy / Inconel for refinery flue-gas
- SS316L for chemical service
- Fabric layup for power-plant ducts (PTFE, glass fibre, ceramic blanket)
- Rubber bellows (EPDM, NBR, Neoprene) for pumps and pipelines
Engineering & qualification
- EJMA spring-rate and cycle-life calculation
- ANSYS FEA validation for critical service
- Squirm pressure test (column stability)
- Cycle-life testing on representative samples
- PMI on every bellows ply
Witnessed. Documented.
Squirm test
Pressure column-stability test to EJMA Annex E.
Cycle life
Representative sample tested for design fatigue life.
Spring rate
Measured axial / lateral / angular spring rates verified.
Material PMI
Positive material identification on every bellows ply.
Recent deliveries.
FCCU Universal Joints
6 × DN 2,800 universal tied joints, Incoloy 800H bellows, 720 °C.
Compressor Discharge Joints
Vibration analysis SKM-ENG-VIB-001, ANSYS FEA validated.
Muara Laboh Steam Bellows
DN 600 SS321 bellows for geothermal steam service.
Specifying a expansion joint? Start here.
Submissions routed directly to the senior engineering desk. Typical response under 24 hours.
Or download the datasheet template