Hybrid Mechanically Lined Pipe Weld Overlay for Reel-Lay Wrinkling
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Solution Overview
Problem
Liner wrinkling in hybrid mechanically lined pipes during reel-lay operations due to differing properties of pipe joints, leading to operational issues such as pressure drop, inhibited pipeline pigging, and potential fracturing.
Innovation Solution
Determining and implementing a minimum weld overlay length greater than or equal to a predetermined length for each pipe joint to prevent liner wrinkling, using a method that includes mechanically lining the pipe with a corrosion-resistant alloy and weld overlaying sections on either side of the liner to create a metallurgical bond, thereby reducing deformation risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pipe joints with differing properties are used in lined pipe, then manufacturing flexibility and cost-effectiveness are improved, but liner wrinkling occurs during bending operations
Solution Approach 1:
The patent applies local quality by providing different weld overlay lengths at different locations along the pipe joint. Specifically, the first weld overlay extends along a first length of the pipe joint while the second weld overlay extends along a second length, with at least one length being sufficient to prevent liner wrinkling in high-stress bending zones. This localized differentiation allows the pipe to accommodate joint property variations without compromising liner integrity.
2Reliability
If minimum weld overlay length is increased to prevent liner wrinkling, then liner integrity is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent implements local quality by specifying different weld overlay lengths for different sections of the pipe joint rather than uniformly increasing the weld overlay length along the entire joint. The first weld overlay and second weld overlay have different lengths tailored to the specific bending and wrinkling risks at each location, optimizing both liner protection and manufacturing efficiency.
3Ease of manufacture
If uniform weld overlay length is applied to all pipe joints, then manufacturing simplicity is maintained, but liner wrinkling cannot be prevented in high-stress zones
Solution Approach 1:
The patent resolves this contradiction by applying local quality principles through differentiated weld overlay lengths. The first weld overlay extends along a first length and the second weld overlay extends along a second length, with the lengths being determined based on the specific bending characteristics and wrinkling risks of each pipe joint section. This approach maintains manufacturing simplicity while effectively preventing liner wrinkling in high-stress zones.
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
The solution effectively reduces or eliminates liner wrinkling, allowing for smoother reel-lay operations, cost savings, reduced operational difficulties, and improved flow performance by preventing deformation-induced issues.
Implementation Method 1
weld overlaying a second section of alloy in the central opening and on a first side of the first section of alloy. The weld overlaying includes welding the second section of alloy to the inner surface of the first pipe joint along a first length
Data Source
AI summary
Aspects of the present disclosure relates to methods of making a hybrid mechanically lined pipe, and apparatus thereof, such as lined pipe used for reeled pipe operations. In one implementation, a method of making a lined pipe for reeled pipe operations includes determining a minimum weld overlay length for a first pipe joint, and providing the first pipe joint. The first pipe joint includes a first end opposite of a second end, a central opening, and an inner surface. The method includes mechanically lining the inner surface of the first pipe joint with a first section of alloy. The method also includes weld overlaying a second section of alloy and a third section of alloy in the central opening and on both sides of the first section of alloy over the minimum weld overlay length to prevent excessive deformation of the mechanically bonded section during reeling operations.