LENS EXPANSION JOINTS

Lens expansion joints are the custom requirements in cases where the application requires a single layer bellow. If the material thickness
of the single layer bellow is more than 4 mm, the supply of a normally manufactured bellow is no longer possible. In this case, a lens expansion joint is the optimum solution. Normally issues concerning material thickness are solved by the supply of a multilayer bellow but in some cases, this is not accepted by the customer and/or the application.

DIMENSIONS

Lens expansion joints can be constructed in all types of stainless steel and in material thickness 1,5-8 mm.
Other dimensions and materials can be discussed upon request.

The construction parameters are as follows:

  • Diameter: up to DN 2500
    Larger dimensions can be discussed on request
  • Radius (R): 15, 20, 30, 50, 60 and 80 mm
    1,5 mm: Max. R =15
    2+3 mm: Max. R =30
    4+5 mm: Max. R =60
    6+8 mm: Max. R = 80
  • Design according to: EJMA, EN 14917, ASME or AD2000
LENS EXPANSION JOINT PROJECTS

ENGINEERED LENS EXPANSION JOINT

Blast furnace, Germany

DN 9500

Steel plant, Germany

ENGINEERED LENS EXPANSION JOINT

Blast furnace, Germany

DN 9500

Steel plant, Germany

ON-SITE INSTALLATION OF LENS EXPANSION JOINTS

Steel plant, Germany

28 PCS. SIZED UP TO DN 3620

Steel plant, Germany

ON-SITE INSTALLATION OF LENS EXPANSION JOINTS

Steel plant, Germany

28 PCS. SIZED UP TO DN 3620

Steel plant, Germany

EXCELLENCE IN

LENS EXPANSION JOINT ENGINEERING

Lens expansion bellows

LENS EXPANSION JOINT CONSTRUCTION

Lens expansion joints are constructed as illustrated on the drawings below.
As it is shown, lens expansion joints are supplied either as a half convolution, a complete convolution or as a bellow. According to the customer’s requirements, these are either delivered already welded together or they can be
welded together on-site.

Half convolution of a lens expansion joint

Convolution from two half convolutions welded together.
The black triangle illustrates the welding.

Bellow from two convolutions welded together from four half convolutions.
The black triangles illustrate the weldings

ADVANTAGES

Lens expansion joints are preferred in all industries that uses pressurised equipment and heat exchangers and where the higher pressure and higher temperature require greater material thickness.

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