Pipeline Lining Undercut for Seamless Weld Joining
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Solution Overview
Problem
Existing pipelines with plastic linings for transporting abrasive liquid/solid mixtures face issues with thermal stress during welding, leading to reduced adhesion or destruction of the lining, and post-coating challenges, especially with thicker wear-resistant linings, which can result in leaks and compromised pipeline integrity.
Innovation Solution
The pipeline design features an undercut in the lining sections to form a fill space that is filled with a curing material after welding, ensuring a continuous, abrasion-resistant lining without the need for sleeves, which simplifies production and maintains consistent quality across the pipeline length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the lining section is extended to the pipe end to eliminate the cutback area, then the post-coating difficulty is reduced, but the thermal energy during welding destroys the lining material
Solution Approach 1:
The lining section is pre-formed with an undercut geometry that creates a fill space before welding occurs. This preliminary structural preparation allows the lining to be positioned optimally relative to the weld seam, eliminating the need for post-coating while preventing thermal damage to the lining material during the welding process.
Solution Approach 2:
The lining section is divided into distinct functional zones: a first portion that contacts the weld seam and a second portion that extends into the pipe. The undercut creates a fill space that separates these zones, allowing the lining to be installed in a single piece without requiring post-coating of a cutback area.
2Reliability
If a sleeve is introduced into the pipeline to enable post-coating of the cutback area, then the lining coverage is improved, but the inner pipeline cross-section is reduced and leak risk increases
Solution Approach 1:
The sleeve component is completely removed from the pipeline system. Instead of using a sleeve to enable post-coating, the invention extracts this intermediate component and relies on the undercut geometry of the lining section itself to create the fill space, thereby simplifying the pipeline structure and eliminating leak risks associated with sleeve connections.
Solution Approach 2:
The functions of the sleeve (enabling post-coating, maintaining structural integrity, preserving cross-section) are merged into the lining section itself through the undercut design. The lining section with its fill space performs all necessary functions without requiring a separate sleeve component.
3Strength
If the lining section is made thicker to improve wear resistance, then the protection capability is enhanced, but the post-coating difficulty increases
Solution Approach 1:
The undercut geometry is pre-formed in thicker lining sections during manufacturing, creating adequate fill space volume even for thick materials (20-50 mm). This preliminary geometric preparation ensures that thick lining sections can be installed without post-coating, maintaining wear resistance while eliminating manufacturing difficulties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution provides a seamless, leak-free, and continuously assessable lining that maintains the properties of the abrasion-inhibiting material, enhancing the pipeline's integrity and reducing manufacturing complexities.
Implementation Method 1
filled with a fill material that in situ will cure and/or will be cured
Data Source
AI summary
A pipeline has a first pipe and a second pipe welded together by a weld seam, wherein the first and second pipes each have an inner side with a lining section of plastic material for protecting an inner side of the pipeline. The lining sections end at a spacing from the weld seam. The lining section of the first pipe abuts the lining section of the second pipe such that by an undercut provided on at least one of the lining sections a fill space is formed in a circumferential direction of the pipeline.