Products Steel expansion joints

Maximum operational reliability and precision thanks to CAD

In order to offer our customers maximum reliability and precision with STENFLEX® steel expansion joints, we design and construct the joints using the very latest CAD processes. Our engineering team simulates form, function and installation prior to commissioning so that the expansion joints are easy to install and are fully equipped to withstand subsequent stress.

Strengths of steel STENFLEX® pipe connections:

  • Above-average service life
  • Guaranteed fault-free operation – often spanning decades
  • High degree of flexibility in installation location and application area
  • Well-established and enhanced over a period of over 50 years
  • Consistently tested for quality and certified
  • Excellent STENFLEX<sup>®</sup> expert advice available

What STENFLEX® steel expansion joints offer in use:

  • Motion compensation
  • Tension reduction
  • Damping of vibration and noise transmissions
  • Equalisation of ground settlement and foundations as well as installation inaccuracies
  • Compressive strength and thermal endurance
  • Vacuum stability, flexibility, corrosion resistance and freedom from maintenance

Where STENFLEX® steel expansion joints are used:

  • Machine construction, apparatus manufacture and pipeline construction
  • The chemicals industry
  • Plant construction
  • Gas and water supply
  • Building services engineering
  • Exhaust systems engineering

As a manufacturer of steel expansion joints, we are reviewed and approved on the basis of the inspection framework of AD data sheets (Arbeitsgemeinschaft Druckbehälter – working group for pressure vessels) regarding the pressure equipment directive and international standards. A number of standards and bodies are used as a basis of assessment, including AD 2000-B13, DIN EN 14917 and EJMA. STENFLEX® steel expansion joints possess type approvals from various classification and certifying bodies and carry the CE mark.

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Axial expansion joints

Structure:
Steel bellows with connection parts (flange, welding end or threaded connection).

Movement absorption:
Axial shift, and slight all-round movement of the expansion joint is possible. Axial expansion joints with two bellows are used to absorb larger movement.

Fixed points:
Robust pipe fixed points and correct pipe routing are necessary to absorb the axial forces.

Lateral expansion joints

Structure:
Steel bellows with laterally movable restraints and flanges or welding ends.

Movement absorption:
Lateral shift of the expansion joint is possible. The restraint absorbs axial reac-
tion force and relieves the pressure on the pipe‘s fixed points. Lateral expan-
sion joints, with two bellows and a connecting pipe are used to absorb large movement.

Fixed points:
Only light fixed points are required to absorb lateral movement and friction force.

Angular expansion joints

Structure:
Steel bellows with hinge restraint and flanges or welding ends. The rotating axis of the hinge restraint is in the middle of the bellows.

Movement absorption:
Angular movement of the expansion joint is possible. The angular joints regulate a defined angular movement, absorb axial reaction force and relieve the pressure on the pipe‘s fixed points. We differentiate between angular expansion joints with a hinge (bellows angular movement guided on one plane) and angular expansion joints with a cardan hinge restraint (bellows movement guided on two planes).

Fixed points:
Only light fixed points are required to absorb angular movement force and friction force.

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