Pipeline Girth Weld Inspection for Coating Suitability
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Solution Overview
Problem
The welding process in pipelines often creates defects in the uncoated end segments of pipes, making it challenging to determine whether the interior surface of girth weld regions is suitable for coating, which is crucial for preventing corrosion.
Innovation Solution
A robot system equipped with a carriage and scanners that scan the interior surface of girth weld regions to generate surface profile data, analyzed to determine the suitability for coating, and an image recording system to evaluate and certify the surface for coating or repair as necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the welding process is used to join pipe segments in the field, then the pipeline can be assembled from modular sections, but defects are created in the interior surface of the girth weld region that may render it unsuitable for coating
Solution Approach 1:
The patent applies preliminary action by inspecting the girth weld region before coating is applied. The robot system scans the interior surface profile of the weld region and identifies defects such as convexities or irregularities that would prevent proper coating adhesion. This pre-inspection allows defects to be detected and repaired before the coating process, ensuring the surface is suitable for coating while maintaining the benefits of field welding assembly.
2Measurement precision
If the interior surface of girth weld regions is inspected using traditional methods, then some defects can be detected, but the inspection is time-consuming and may miss subtle surface profile defects that affect coating suitability
Solution Approach 1:
The patent replaces traditional mechanical inspection methods with an automated robot system that uses optical or laser-based scanning technology. The robot carriage travels through the pipeline and uses scanners to measure the interior surface profile of girth weld regions, generating digital data that is analyzed to identify defects. This substitution of mechanical inspection with automated scanning significantly improves measurement precision for detecting subtle surface irregularities while reducing inspection time through continuous automated operation.
Solution Approach 2:
The inspection system is self-service in that the robot autonomously navigates the pipeline, positions itself at girth weld regions, performs the scanning operation, and generates the inspection report without requiring manual intervention for each measurement point. The automated data analysis independently determines whether the surface is suitable for coating, eliminating the need for manual measurement and interpretation by inspectors.
3Productivity
If all girth weld regions are coated without inspection, then the coating process is faster and more efficient, but defects in the weld surface result in poor coating adhesion and reduced corrosion protection
Solution Approach 1:
The system performs preliminary inspection of each girth weld region before the coating process begins. The robot scans the interior surface profile and generates a report indicating whether the surface is suitable for coating. This allows the coating process to proceed efficiently on suitable surfaces while identifying specific regions that require repair, thereby maintaining both high productivity and coating quality.
Solution Approach 2:
The inspection system applies local quality by evaluating each girth weld region individually rather than treating all surfaces uniformly. The robot identifies specific locations with surface defects such as convexities or irregularities that would affect coating adhesion. This allows selective repair of only the defective regions while proceeding with coating on suitable areas, maintaining overall coating quality without requiring rework of the entire pipeline.
Data Source
AI summary
A system for inspecting an interior surface of a girth weld region of a pipeline includes a robot that includes a scanner mounted on a carriage for scanning the interior surface of the girth weld region to generate surface profile data. A profile analyzer receives the surface profile data and outputs an indication of whether the interior surface of the girth weld region is suitable for being coated. In some embodiments, an imaging system captures images of the girth weld region as it is being scanned. In a method of coating the girth weld regions of a pipeline, the images of a girth weld region found to be unsuitable for being coated based on the scanning data are used to certify whether the girth weld region is suitable for being coated.