Screwed pipe joint and method for the production thereof

Abstract

A screwed pipe connection for connecting a pipeline including a connection end having a formed wall region. The screwed pipe connection includes a connection part and a union joint part. Proceeding from the end face of the connection end of the pipeline, an outside cross-section of the pipeline increases and is larger than the nominal outside cross-section, then decreases again. Proceeding from the end face, a clear inside cross-section of the connection end is larger than the nominal inside cross-section and decreases to the nominal inside cross-section. The wall thickness on the end face is smaller than the nominal wall thickness, and wherein an inner material difference, resulting from the deviation of the inside cross-section from the nominal inside cross-section, and an outer material difference, resulting from the deviation of the outside cross-section from the nominal outside cross-section, deviate from one another by a maximum of 30 percent.

Description

technical field [0001] The invention relates to a threaded pipe connection for connecting pipes having a nominal (nominell) outer cross section, a nominal inner cross section, a nominal pipe wall thickness and a socket end with a pipe wall region configured by deformation, The threaded pipe connection comprises a plug-in piece and a threaded connection piece with a cap seal for holding the pipe in a sealed manner and can be screwed together with the plug-in piece, wherein the plug-in piece has a receiving opening, The receiving opening has an inner conical surface that expands outwards in the direction of the pipe, wherein the deformed pipe wall region of the plug-in end of the pipe can be clamped in a form-fitting and / or force-fitting manner between the plug-in part and the threaded connection between, and wherein at the spigot end and at the end of the first length extending axially from the end face towards the connector, the outer cross-section of the duct formed by the ou...

AI Technical Summary

Problems solved by technology

Within these ranges, due to pinching, if any, damage to the anti-corrosion coating of the pipes could be detrimental

Furthermore, texturing machines are often expensive as they must be designed to generate extremely high forces (eg: 1000kN for a 42mm pipe diameter)

[0009] In such threaded pipe joints, the main problem is also that, during installation, the pipe tends to rotate together due to the threaded connection (cap gland nut) that needs to be screwed

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