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Jacketed

METALLIC JACKETED EXPANSION JOINT

A specialized expansion joint featuring a double-wall construction, with an external jacket that ensures uniform heating or cooling of the media within the bellows and pipeline.

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Jacketed

expansion joint

The Metallic Jacketed Expansion Joint consists of an inner bellows and an outer jacket, through which a heating or cooling medium (such as steam, oil, or water) is circulated. This construction maintains a controlled temperature inside the main pipeline, preventing condensation, solidification, or crystallization of process media. Jacketed joints are supplied with weld ends, fixed flanges, or loose flanges, and can be customized with liners and insulation depending on process requirements.

  • Size Range (DN)

    DN50 – DN5000

  • Materials

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

  • Movements

    Axial (primary), plus limited Lateral & Angular

  • Pressure Rating

    Up to 100 bar (higher on request)

  • Temperature Range

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

Jacketed

expansion joint

The Metallic Jacketed Expansion Joint consists of an inner bellows and an outer jacket, through which a heating or cooling medium (such as steam, oil, or water) is circulated. This construction maintains a controlled temperature inside the main pipeline, preventing condensation, solidification, or crystallization of process media. Jacketed joints are supplied with weld ends, fixed flanges, or loose flanges, and can be customized with liners and insulation depending on process requirements.

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  • Size Range (DN)

    DN50 – DN5000

  • Materials

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

  • Movements

    Axial (primary), plus limited Lateral & Angular

  • Pressure Rating

    Up to 100 bar (higher on request)

  • Temperature Range

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

Typical use case: Extensively used in process lines transporting viscous or temperature-sensitive fluids, where continuous heating or cooling prevents media from solidifying or depositing inside the pipe.

Other applications include:

  • Chemical and petrochemical plants (bitumen, resins, polymers)
  • Food and pharmaceutical industries (syrups, oils, adhesives)
  • Oil & gas pipelines transporting waxy crude
  • Steam tracing and thermal fluid circulation systems
  • Ensures process media remains at the required temperature during flow
  • Prevents clogging, crystallization, or condensation inside pipelines
  • Provides reliable axial expansion absorption while maintaining heat transfer
  • Double-wall construction enhances thermal control
  • High corrosion, temperature, and pressure resistance
  • Long service life with minimal maintenance
  • Available in multiple end connection types (weld ends, fixed/loose flanges)
  • Optional accessories include internal liners, insulation, and custom jackets
JACKETED EXPANSION
External Jacket

circulates heating or cooling medium around the bellows

Flow Liner / Inner Sleeve

protects bellows from process media turbulence

End Connections

weld ends, fixed flanges, or loose flanges

Insulation Layers –

minimize heat loss for temperature-sensitive applications

Support Rods / Limit Rods

protect against over-compression or over-extension