Pipeline Sprayer With Low-Pressure Coating for Girth Weld Cutbacks
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Solution Overview
Problem
Existing automated systems for coating the cutback region of oil and gas pipelines are cumbersome, require solvents, and suffer from user error and inconsistency in application, posing health and safety risks due to their complexity and reliance on high-pressure systems.
Innovation Solution
A compact, solvent-free automated spray apparatus with a roller carriage and cantilevered arm for circumferential and lateral travel, equipped with disposable or refillable cartridges and a mixer, allowing for controlled, even application of multi-component coatings around the girth weld.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If automated spray systems are used to coat the cutback region, then coating consistency and uniformity are improved, but device complexity and health and safety risks increase due to high-pressure systems and solvent requirements
Solution Approach 1:
The patent replaces high-pressure mechanical spray systems with a low-pressure air-assisted spray system. The coating is delivered through a hose at low pressure and mixed with air at the spray tip, eliminating the need for complex high-pressure pumps, regulators, and associated safety systems while maintaining coating uniformity through the air atomization process
Solution Approach 2:
The patent extracts and eliminates the solvent flushing system from traditional spray equipment. By using a disposable or easily cleanable spray tip and low-pressure delivery, the system removes the need for solvent-based cleaning mechanisms, high-pressure flush systems, and associated waste management infrastructure
2Productivity
If high-pressure spray systems are used, then coating application speed is improved, but health and safety risks worsen due to toxic solvent exposure and system failures
Solution Approach 1:
The patent substitutes high-pressure mechanical delivery with low-pressure air-assisted delivery. The coating material flows through the hose at low pressure and is atomized by compressed air at the spray tip, maintaining application speed while eliminating the hazards of high-pressure systems including toxic solvent aerosols, system failures, and operator exposure
Solution Approach 2:
The patent creates a safer working environment by using air as the carrier and atomizing medium instead of toxic solvents. The low-pressure system operates without hazardous chemical flushing requirements, effectively creating an inert or at least non-toxic atmosphere around the application area
3Ease of manufacture
If traditional manual coating methods are used, then equipment cost is reduced, but coating consistency and application quality deteriorate due to user error and uneven application
Solution Approach 1:
The patent replaces manual roller or brush application with an automated air-assisted spray system. The spray tip automatically atomizes the coating material and distributes it evenly across the surface, eliminating user error and inconsistent application thickness while keeping equipment costs low through the use of simple compressed air delivery and disposable spray tips
Solution Approach 2:
The spray tip performs self-atomization by mixing the low-pressure coating flow with compressed air at the tip itself. This self-service mechanism requires no external mixing equipment, complex delivery systems, or skilled operators, achieving consistent atomization and coating distribution automatically
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 apparatus ensures uniform, efficient coating of the cutback region with reduced health and safety risks, improved consistency, and simplified operation, eliminating the need for solvents and complex high-pressure systems.
Implementation Method 1
a spray nozzle configured to spray the mixed coating material onto the cutback region of the pipe
Data Source
AI summary
Provided is an apparatus for coating a girth weld and a cutback region surrounding said girth weld, said apparatus having lateral travel at least equal to the length of the cutback region and circumferential rotational travel around the pipe. The apparatus can provide a multiple component coating accurately and safely, without the need for solvent flushing of the apparatus.