Corrosion Resistant Sheet Metal Jacketing for Insulated Pipes
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Solution Overview
Problem
Existing insulated pipe jackets made from expensive 300 series stainless steel are costly and prone to corrosion in corrosive environments, leading to damage and failure of underlying insulation, while less expensive stainless steel options are susceptible to galvanic and local corrosion.
Innovation Solution
A layered sheet metal jacketing system using a fluoropolymer or polyvinylidene fluoride outer layer, a polyethylene inner layer, and a core layer of lesser stainless steel (Series 200 or 400) with a strong adhesive, providing enhanced corrosion resistance and durability at a reduced cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 300 series stainless steel is used for pipe jacketing, then corrosion resistance is improved, but cost increases significantly
Solution Approach 1:
The patent applies composite materials by combining a base metal layer (less expensive stainless steel or aluminum) with a thin coating layer of 300 series stainless steel or other corrosion-resistant material. This composite structure provides the corrosion resistance of expensive materials while reducing overall material cost through the use of cheaper substrate materials.
Solution Approach 2:
The patent implements local quality by applying corrosion-resistant coating only where needed on the pipe jacketing surface, rather than using expensive corrosion-resistant materials throughout the entire structure. This allows cost reduction in areas where high corrosion resistance is not critical while maintaining protection where it is most needed.
2Ease of manufacture
If less expensive stainless steel (Series 200 or 400) is used, then cost is reduced, but susceptibility to galvanic and local corrosion increases
Solution Approach 1:
The patent uses composite materials by combining less expensive Series 200 or 400 stainless steel with a protective coating layer. This allows the base material to provide structural integrity at lower cost while the coating layer provides the necessary corrosion resistance, eliminating the susceptibility to galvanic and local corrosion.
Solution Approach 2:
The patent introduces an intermediary protective coating layer between the less expensive base metal and the corrosive environment. This intermediary layer acts as a barrier that prevents direct contact between the corrosive substances and the more susceptible base metal, thereby protecting against galvanic and local corrosion.
3Strength
If metal jacketing is used to protect insulated pipe, then mechanical protection is improved, but the underlying insulation can still corrode and fail in corrosive environments
Solution Approach 1:
The patent introduces an intermediary protective layer (such as a polymer coating or corrosion-resistant metal coating) between the metal jacketing and the underlying insulation. This intermediary layer acts as a barrier that prevents corrosive substances from reaching the insulation, thereby maintaining insulation integrity while preserving the mechanical protection benefits of the metal jacketing.
Solution Approach 2:
The patent employs composite materials by creating a multi-layer structure that combines metal jacketing for mechanical strength with a corrosion-resistant coating layer that protects the underlying insulation. This composite structure provides both mechanical protection and corrosion protection, preventing insulation failure in corrosive environments.
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 offers a durable, cost-effective corrosion-resistant jacket that maintains integrity over time, withstanding severe environmental conditions and reducing maintenance costs, while preventing chalking and corrosion, even after extended exposure to QUV-B testing.
Implementation Method 1
The film is adhered to the core layer with an adhesive, such as an acrylic adhesive, preferably a pressure sensitive adhesive.
Data Source
AI summary
A corrosion resistant jacket for insulated pipes and components includes an outer polymeric layer film, an inner polymeric layer and a core layer of a lesser stainless steel material disposed between the outer polymeric layer film and the inner polymeric layer.