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Metal bellows expansion joints

Metal Bellows expansions joints are compensating elements used for thermal expansion and relative movement in pipelines. They consist of one or more metal bellows, connectors at both ends, and tie rods that depend on the application.

Multi-Ply Bellows

To increase both flexibility and stability, multiple thin plies of metal are layered to form the bellow walls.

There are two basic design types : The multi-ply and the multi-walled bellows structure.

It has following advantages :
  • Resistance to high and very high pressures
  • Large movement absorption
  • Small dimensions
  • Small adjusting force rates
  • Optimal compensation in a very small space
  • Insulation against structure-borne noise up to 20dB

Types of Expansion joints

(Based on compensating movement - Axial, Angular& Lateral)
  • The axial expansion joint absorbs movement in an axial direction. Standard connectors of the axial expansion joint are welded ends, fixed flanges and loose flanges.
  • The universal expansion joint can absorb not only axial movements but angular and lateral movements as well. It consists of two metal bellows with an intermediate pipe and connectors on both sides. It is usually used to compensate large axial and lateral movements at low pressure.
  • Angular expansion joint absorbs bending and angular movement. Like a simple axial expansion joint, it consists of a metal bellows and connectors on both sides. It also features
    • a. A hinged anchoring of these connectors for angular movements in a single plane, or
    • b. A gimbal-mounted anchoring for angular movements in all planes
  • Lateral expansion joint absorbs transverse and lateral movements. It consists of
    • a. One or two metal bellows with an intermediate pipe
    • b. Connectors on both sides and a hinged anchoring of these connectors for lateral movement in a single plane or for lateral movement in all planes

Specifications

  • Material : SS304 , SS304L, SS316, SS321 etc.
  • Ply : Single Ply or Multi-ply
  • Size Range : N.B. 20 ~ 2000 mm
  • Formation : Hydro-formed (20 ~300 mm), Roll-Formed (20 ~ 2000 mm)
  • Joint Type : Axial, Universal, Angular & Lateral-as per requirement
  • Flange Types : As per customer Specification
  • Flange Material : Zn coated Steel, SS202, SS304, SS316 or as specified

Quality

Our bellows are designed as per the EJMA Standards, however, we are capable to design these with customization to suit specific customer specifications. We have a standard range of single ply bellows for uses in engine exhaust applications as well as general-purpose and low-pressure applications.


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