Oil Pipe Lining Primer and Overcoat for Corrosion and Plugging
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Solution Overview
Problem
Oil conveying pipes face severe corrosion and plugging issues due to corrosive materials and insoluble organic materials, which lead to restricted oil flow and pipe plugging, and existing fluoropolymer linings do not adequately address these problems as they do not adhere to the pipe surface.
Innovation Solution
A lining comprising a primer layer and an impermeable perfluoropolymer overcoat is applied to the interior surface of oil pipes, providing adhesion and a non-stick surface that minimizes deposition of asphaltenes, paraffin wax, and inorganic scale, while being impermeable to salt water and corrosive materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If fluoropolymer lining is applied to provide non-stick surface, then deposition of asphaltenes and paraffin is reduced, but adhesion to pipe surface is lost
Solution Approach 1:
The lining is divided into two distinct layers: a primer layer for adhesion to the pipe surface and an overcoat layer for non-stick properties. This segmentation allows each layer to specialize in one function, resolving the contradiction between adhesion and non-stick performance.
Solution Approach 2:
The lining combines two different materials with complementary properties: a polymer-based primer layer that adheres to metal surfaces and a fluoropolymer overcoat that provides non-stick characteristics. This composite structure integrates both required functions in a single lining system.
2Ease of manufacture
If carbon steel pipe is used for economy reasons, then manufacturing cost is reduced, but corrosion resistance is worsened
Solution Approach 1:
The primer layer acts as an intermediary between the carbon steel pipe and the corrosive environment. It provides the adhesion needed to anchor the protective overcoat to the metal surface, enabling the economical carbon steel pipe to achieve corrosion resistance through the combined lining system.
Solution Approach 2:
The lining system changes the surface parameters of the carbon steel pipe, transforming it from a corrosion-prone metal surface to a protected, non-stick surface with enhanced chemical resistance, while maintaining the bulk material's cost advantages.
3Object-generated harmful factors
If single-layer fluoropolymer lining is used, then non-stick property is achieved, but adhesion and corrosion protection are insufficient
Solution Approach 1:
The single-layer fluoropolymer lining is segmented into two functional layers: the primer layer handles adhesion and corrosion protection, while the overcoat layer provides the non-stick property. This functional segmentation resolves the contradiction by assigning each property to the most suitable layer.
Solution Approach 2:
The solution uses a composite material structure where the primer layer (polymer-based) and overcoat layer (fluoropolymer) are combined. This composite approach allows the system to exhibit both strong adhesion/corrosion resistance and non-stick properties that neither material could provide alone.
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 significantly reduces deposition by at least 40% and provides corrosion resistance and salt-water impermeability, ensuring effective oil flow and prolonged pipe integrity.
Implementation Method 1
the overcoat is impermeable to salt water, as well as to the corrosive materials present in the oil and presents a non-stick surface to the oil, whereby the insoluble organic materials present in the oil do not stick to the overcoat lining
Implementation Method 2
The lining of the present invention either minimizes or eliminates (i) the deposition of asphaltenes, paraffin wax, and inorganic scale... While it is the primer layer that provides the adherence to the pipe
Implementation Method 3
the overcoat is impermeable to salt water, as well as to the corrosive materials present in the oil
Data Source
AI summary
The present invention relates to a process for adhering a lining to the interior surface of an oil pipe wherein the lining imparts substantially reduced adhesion of asphaltenes, paraffin wax, and inorganic scale, so as to reduce plugging of the oil pipe, and impermeability to salt water so as to protect the oil pipe from corrosion.