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Externally Pressurized

METALLIC EXTERNALLY PRESSURIZED EXPANSION JOINT

A specially engineered expansion joint where the pressure acts on the outside of the bellows, enabling very large axial movements while preventing squirm or instability.

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Externally Pressurized

expansion joint

The Metallic Externally Pressurized Expansion Joint uses a unique design in which the process pressure is applied externally to the bellows element rather than internally. This allows the joint to absorb long axial movements without the risk of squirm, buckling, or premature fatigue. Typically supplied with butt weld ends or flanged connections, these joints are well-suited for long pipeline runs requiring high reliability and stability under pressure.

  • Size Range (DN)

    DN50 – DN5000

  • Materials

    SS304 / SS316L / SS321 / Inconel / Hastelloy / others on request

  • Movements

    Axial (long stroke)

  • Pressure Rating

    Up to 100 bar (higher on request)

  • Temperature Range

    –196°C to +800°C (depending on material)

Externally Pressurized

expansion joint

The Metallic Externally Pressurized Expansion Joint uses a unique design in which the process pressure is applied externally to the bellows element rather than internally. This allows the joint to absorb long axial movements without the risk of squirm, buckling, or premature fatigue. Typically supplied with butt weld ends or flanged connections, these joints are well-suited for long pipeline runs requiring high reliability and stability under pressure.

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  • Size Range (DN)

    DN50 – DN5000

  • Materials

    SS304 / SS316L / SS321 / Inconel / Hastelloy / others on request

  • Movements

    Axial (long stroke)

  • Pressure Rating

    Up to 100 bar (higher on request)

  • Temperature Range

    –196°C to +800°C (depending on material)

Typical use case: Widely used in long pipeline runs that require absorption of very large axial thermal expansions, such as in district heating, cryogenic transfer lines, or steam distribution networks.

Other applications include:

  • High-temperature process pipelines in power plants
  • Oil & gas transmission lines
  • Chemical and petrochemical plants
  • HVAC and utility piping systems with extended runs
  • Designed to accommodate large axial movements without risk of squirm
  • Stable under high-pressure and long-stroke applications
  • Enhances safety and fatigue resistance in long pipeline runs
  • Compact and robust construction with high mechanical strength
  • Resistant to corrosion, high temperature, and pressure extremes
  • Long service life with minimal maintenance
  • Multiple connection types available (butt weld, fixed/loose flanges)
  • Optional liners, covers, and limit rods available for added protection
EXTERNALLLY PRESSURIZED
External Pressure Chamber

transfers pressure load outside the bellows for stability

Flow Liner / Inner Sleeve

protects against abrasive or turbulent flow

End Connections

weld ends, fixed flanges, or loose flanges

Limit Rods

prevent excessive stroke or over-compression

External Covers / Shrouds

safeguard against mechanical damage