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The Witzenmann Group offers a product range tailored for plant engineering and construction.

Flexible elements for plant and pipeline construction

Our expansion joint, flexible metal hose, metal bellows and spring and constant hanger solutions are ideal for every application in plant engineering and construction.

Our variable and targeted pipe bracket products are designed based on the two pipeline construction calculation programs Intergraph CAESAR II and Sigma Rohr2. Our specially adapted design tool FLEXPERTE has the required interfaces to transfer the product specifications directly into the planning and design as 3D CAD models.

Applications in plant engineering and construction and pipeline construction

Flexible Trace Heating System

Flexible Heat Trace Image Text

The flexible heat trace hose heats the pipe below the insulation to a maximum temperature of 200 °C, using steam or hot water. The large corrugated surface ensures optimum heat transfer. The easy-to-bend annular corrugated hose enables easy and trouble-free installation.

  • high heat exchanger output
  • cost savings thanks to simple and curved installation
  • no welding necessary
  • no buckling

Flexible Heat Trace

Find out more about metal hoses

Low temperature

FCC refinery after Catofin process

Material and engineering challenge in the high-temperature field

Fluid Catalytic Cracking

In order to protect an expansion joint from extreme temperatures, either a refractory lining is inserted inside (cold wall design) or high-temperature resistant materials such as Alloy 800H or Alloy 625 are used (hot wall design). For the refractory lining, hexmesh structures or stainless steel anchors are welded in and cast with special concrete and metal reinforcement if necessary. Insulated inner sleeves in the area of the metal bellows protect against the high medium temperatures.

Since concrete-lined universal expansion joints are very heavy, pantographs are used here as restraint hardware. They prevent the bellows from buckling due to the weight of the intermediate pipe. At the same time, the pantograph distributes the loads evenly over the bellows elements.

Find out more about expansion joints
Panthograph Vertical Tabs TextImage


Witzenmann is one of the few companies approved to supply Catofin plants in the high temperature field. With intelligent engineering and patented solutions, we have achieved a technological lead in this field.

  • Combined hot/cold wall design with minimized weld seam load
  • FEM design
  • patented detailed solutions
  • long-lasting durability
3D animation expansion joint Image Text


The 3-D CFD (computational fluid dynamics) calculation is used to calculate pressures, temperatures and flow velocities of moving media within fixed geometries. Here for an expansion joint with purged inner sleeves to calculate the temperature and flow distribution of the injected propane gas as barrier flow.

3D CFD Image Text
media temperature
DN 3600
largest expansion joint manufactured for FCC
27 t
expansion joint single weight for FCC plant in Africa

Next steps

Configure products

Use our FLEXPERTE tool to configure products, quickly and easily, to meet your individual requirements.


  • Design of standard products
  • Creation of data sheets
  • Preparation of Enquiries

Download: FLEXPERTE customer version

FLEXPERTE: The design program for the Witzenmann Group's entire product range with function-specific subdivisions

  • Flexible metal hoses
  • Expansion joints
  • Metal bellows
  • Bearings, hangers, supports

Drawing data, including complete 3D CAD drawings, is stored alongside the calculation formulae. With PDS and PDMS interfaces, the program is versatile and universally usable.