Universal Expansion Joint
- Simple design, Relatively low cost
- The universal configuration can be designed with a very low lateral spring rate and high lateral
movement capacity - Versatile and common throughout all industries
- Use of tie rods contain pressure thrust. Can also include hinges or gimbals
Applications
Operating Range
- Full vacuum to 2000 psig depending on size
- Cryogenic to 1650°F+
- Sizes from 1” NPS to > 240” NPS
Materials
- 3XX Series Stainless Steel
- Nickel Alloys
- Carbon Steel
- Titanium
- Zirconium
FIT
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Bellows may be attached or linked
to piping flanges, pipe, or other typical industrial connections.
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End connections may conform to standards such as ASME B16.5, ASME B36.10, or customer designed
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Fittings generally not the same at all locations: interface connections may be as noted above. Connections within the assembly are typically to pipe.
FORM
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Two circular metal bellows, each with 1 or more convolutions.
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Typical dimensions of 1⁄2” ANSI NPS to 240” ID. Overall length may vary, typically within the range of 18” to 240”.
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Bellows may include reinforcement or controlling members
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Convolutions may be U shaped or toroidal
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Additional accessories may be incorporated such as load bearing restraints, movement limiters, protection on devices
FUNCTION
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Absorbs movement, primarily perpendicular to the complete assembly (lateral) but often includes axial and/or angular movements
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Movement amplitude varies, typically within the range of 1/2” to 20”.
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Movement frequency may be extreme low cycle (1 per year), or high cyclic (such as vibration at 60 Hz)
