Composite Thief Hatch Corrosion Resistance
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Solution Overview
Problem
Thief hatch systems in the oil and gas industry face issues with corrosion due to dissimilar metals, leading to seal integrity degradation and uncontrolled venting of hydrocarbon gases, which poses safety risks and regulatory penalties.
Innovation Solution
The use of composite materials, such as polymer-reinforced flanges and lids with integrated hinges and elastomer gaskets, designed to prevent corrosion and maintain seal integrity, even in harsh environments, along with optional sensors for monitoring and adjusting venting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If dissimilar metals are used in thief hatch construction, then manufacturing flexibility and strength are improved, but corrosion resistance and seal integrity deteriorate
Solution Approach 1:
The patent applies homogeneity by using the same composite material (polymer matrix with fiber reinforcement) for both the flange body and lid components. This eliminates dissimilar metal contact and galvanic corrosion, ensuring uniform corrosion resistance and seal integrity across all hatch components while maintaining structural strength through optimized fiber reinforcement.
Solution Approach 2:
The patent employs composite materials consisting of a polymer matrix combined with fiber reinforcement (such as glass, carbon, or aramid fibers). This composite structure provides both the necessary structural strength and corrosion resistance, replacing traditional dissimilar metal constructions while maintaining mechanical integrity and preventing galvanic corrosion.
2Strength
If metal materials are used for thief hatch components, then structural strength is improved, but corrosion resistance and durability in harsh environments deteriorate
Solution Approach 1:
The patent uses composite materials with a polymer matrix and fiber reinforcement to replace traditional metals. This provides equivalent or superior structural strength while adding exceptional corrosion resistance and durability in harsh environments including exposure to chemicals, moisture, and UV radiation, thereby extending service life significantly.
Solution Approach 2:
The patent changes the material parameters by selecting composite materials with specific fiber types, orientations, and volume fractions to achieve the required structural strength. Simultaneously, the polymer matrix selection is optimized for chemical resistance, UV stability, and environmental durability, creating a material system that meets both strength and longevity requirements.
3Reliability
If composite materials are used for thief hatch components, then corrosion resistance and durability are improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the thief hatch into separate moldable components (flange body, lid, and gasket) that can be manufactured independently using composite molding techniques. This allows for simplified tooling and manufacturing processes compared to attempting to form complex integrated metal structures, while maintaining corrosion resistance through the composite material system.
Data Source
AI summary
The present disclosure refers to a system and components for a thief hatch. The thief hatch may include a flange body comprising a first composite material. The flange is configured to attach to a tank roof. A lid is operably connected to the flange body. The lid comprises a second composite material. The lid comprises a hinge operably connected to allow for at least partial opening and closing of the lid. The first composite material and the second composite material are the same material or different materials.