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Joining techniques

Line pipe for the transportation of drinking water, industrial water and waste water

Steel line pipe for water and wastewater systems is available with a full range of connections to suit the intended application. The requirements and designs are standardized in DIN 2460 and EN 10311.

Depending on the operating conditions of a pipeline, such as the operating pressure and the transported medium, various joining techniques are available – and thus a variety of options and diverse degrees of freedom – for the installation of the pipeline and its subsequent operation.

Basically, we differentiate between mechanical and welded pipe joints. Examples of non-permanent mechanical joints are couplings and flanges. They are predominantly used in non-buried pipelines. As to joint welding, we offer butt-weld and slip-welding options.

Possible joining techniques

Flange connection

Description
Threaded connection with various designs, such as fixed and loose flanges

Properties Non-permanent connection for unburied pipelines Ideal for fire mains and industrial piping systems

Flange connection

Coupling

Description
Threaded coupling elements for pipes with grooved joints

Properties
Non-permanent connection for unburied pipelines
Ideal for fire mains and industrial piping systems

Coupling

Butt-weld joint

Description
Standard end design for welded joints: Variant C3

Properties
Optimally suited for drinking water pipelines, force-locking, with axial conductivity for cathodic corrosion protection, suitable for open-cut pipeline method.
Nondestructive testing possible.

Butt-weld joint

Slip welding joint

Description
Special design for aggressive media

Properties
Optimally suited for water and wastewater pipes, force-locking, with axial conductivity for cathodic corrosion protection, suitable for open-cut pipeline method. Nondestructive testing possible. During welding, the joint area can be protected with suitable sealing materials.

Slip welding joint

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