UNIVERSAL EXPANSION JOINTS

Universal expansion joints consist of two multi-convoluted bellows connected with an intermediate pipe into one assembly.

Belman has developed a series of universal expansion joints that allows all three movements: axial, lateral and angular simultaneously.
The universal expansion joints can be equipped with all kinds of end connections, like welding ends, welded or loose flanges, and an endless number of accessories such as inner sleeves, cover and movement controls.

DIMENSIONS

Belman design and manufacture a wide range of universal expansion joints.

Customised solutions
As customised solutions joints universal expansion joints are available in all sizes up to DN 12.000, all designs and all materials.

Standard solutions
As standard solutions universal expansion joints are available in size range DN 50 – 2200.

UNIVERSAL EXPANSION JOINT TYPES

Belman bellows UN2BU
UNIVERSAL
with loose flanges

UN2BU / ID no. 51
DN 50 – 2200
PN 2,5
Download (PDF)

Belman bellows UN2FU
UNIVERSAL
with welded flanges

UN2FU / ID no. 52
DN 50 – 2200
PN 2,5
Download (PDF)

Belman UN2SU compensators
UNIVERSAL
with welding ends

UN2SU / ID no. 53
DN 50 – 2200
PN 2,5
Download (PDF)

Expansion joint

CATALOGUE

Comprehensive technical data and selection criteria for +3500 standard metallic expansion joints.

CUSTOMISED UNIVERSAL EXPANSION JOINTS

LARGE DIMENSION

Pulp & paper plant, Indonesia

SPECIAL PAINT

Pulp & Paper plant builder, Austria

LARGE DIMENSION

Pulp & paper plant, Indonesia

SPECIAL PAINT

Pulp & Paper plant builder, Austria

UNIVERSAL EXPANSION JOINT

Toilet paper manufacturer, Poland

TIED UNIVERSAL EXPANSION JOINT

Chemical plant, Germany

UNIVERSAL EXPANSION JOINT

Toilet paper manufacturer, Poland

TIED UNIVERSAL EXPANSION JOINT

Chemical plant, Germany

TECHNICAL DESCRIPTION

The universal expansion joints allow a large amount of lateral offset in multiple planes, and the lateral deflection can be increased or decreased by changing the length of the intermediate pipe. Universal expansion joints do not use tie rods, and are therefore suitable only for low pressure applications. Fix points and guides must be sufficiently designed to withstand the full pressure thrust forces and other loads. An universal expansion joint is not to be confused with a lateral expansion joint

Definitions
Movement is shown as AX (axial), LA (lateral), AN (angular) mm + deg. The parallel displacement is indicated as negative (-) and positive (+) respectively. It is very important to notice if the movements is stated in combination (universal), or as an alternatively combination of the different directions.

Example
The elongation of the bellow is +10 and the compression of the bellow is -20. This will be shown as: +10/-20 mm. Equal parallel displacement is shown as: +/-20 mm.

APPLICATION

Universal expansion joints can absorb movements in all directions, and are used in uncritical, low pressure installations like ventilation ducts, exhaust gas systems, fresh air ventilation and process equipment.

ADVANTAGES & REQUIREMENTS

Advantages

  • Absorbs movements in all directions
  • Absorption of large axial movements and lateral movements in one expansion joint
  • Can be modified to suit existing installation gap

Requirements

  • Only for low pressure applications
  • Fix points and good guides are required
  • Many fix points and guides are needed for long pipe sections

PIPE WORK GUIDELINES

INSTALLATION EXAMPLES

Universal expansion joint to absorb lateral movement

Shows a tied universal expansion joint used to absorb lateral deflection in a single plane
“Z” bend. Where dimensionally feasible, the expansion joint should be designed to fill the entire offset leg so that its expansion is absorbed within the tie rods as axial movement. The tie rod should be extended to the elbow centre line when practical. The thermal movement of the horizontal lines is absorbed as lateral deflection by the expansion joint. Only directional guiding is required since the compressive loading on the pipe consists only of the force necessary to deflect the expansion joint. Any thermal expansion of the offset leg external to the tie rods, such as that part of the elbows at either end, must be absorbed by bending of the horizontal pipe legs. Provisions should be made in the design of the guides to allow for both this deflection and the reduced length of the expansion joint in its deflected position.

Universal expansion joint in “Z” bend

Shows a typical application of a tied universal expansion joint in a three plane “Z” bend.
Since the universal expansion joint can absorb lateral deflection in any direction, the two horizontal piping legs may lie at any angle in the horizontal plane.

Our experience, your benefit
CUSTOMISED
EXPANSION JOINTS!
If the required/specified expansion joint is not found in our standard product range, please do not hesitate to forward your specifications to us. We are specialised in designing and manufacturing of cost-efficient customised solutions.
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