Anti-Corrosive Pipe Wrapping With Adhesive-Bonded Inner and Outer Wraps
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Solution Overview
Problem
Existing anti-corrosive wrappings for metal pipes and fittings face challenges such as difficulty in adhering the outerwrap to the innerwrap, cumbersome application requiring machinery, and the need for a primer and complex application processes.
Innovation Solution
An anti-corrosive wrapping system featuring a viscoelastic corrosion protection material with a moisture-curing adhesive and flexible glass fibre backing, allowing for easy hand application and self-repair capabilities without the need for a primer or machinery, and ensuring strong adhesion between the inner and outer wraps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a woven polypropylene fabric backing is used in the innerwrap, then the wrapping becomes resistant to soil stress, but it becomes difficult to adhere the outerwrap to the backing
Solution Approach 1:
A bitumen layer is introduced as an intermediary between the woven polypropylene fabric backing and the outerwrap. The bitumen layer is bonded to the fabric backing and provides a suitable surface for the outerwrap to adhere to, resolving the adhesion problem while maintaining the soil stress resistance of the fabric backing.
2Reliability
If a release film is used over the bitumen layer, then the bitumen is protected during storage and transport, but the wrapping becomes difficult to hand apply as the release layer does not tear easily
Solution Approach 1:
The release film is provided with pre-scored tear lines that create local weaknesses at specific positions. This allows the film to maintain its protective function during storage and transport while enabling easy manual tearing at the scored locations during application, resolving the contradiction between protection and ease of handling.
3Reliability
If the anti-corrosive wrapping is designed with multiple layers and materials, then corrosion protection is improved, but the application process becomes complex and requires wrapping machinery
Solution Approach 1:
Multiple functional layers (woven fabric backing, bitumen corrosion protection layer, release film with tear lines) are merged into a single integrated innerwrap assembly. This combination maintains the superior corrosion protection of multiple layers while simplifying the application process, as the entire assembly can be manually applied as one unit without requiring complex wrapping machinery.
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 enables easy, efficient, and self-repairing anti-corrosive protection for metal components, reducing application complexity and enhancing durability against soil stress and damage from sharp objects.
Implementation Method 1
a moisture-curing adhesive
Implementation Method 2
viscoelastic corrosion protection material
Data Source
AI summary
The present disclosure provides an anti-corrosive wrapping for a metal pipe (10) (or a metal pipe fitting). The wrapping has an innerwrap (14) including glass fibres which carries a viscoelastic thermoplastic corrosion protection material (13). The wrapping has an outerwrap (16) including glass fibres which is impregnated with an adhesive. The innerwrap (14) is wrappable around the metal pipe (10) with the viscoelastic thermoplastic corrosion protection material (13) carried by the innerwrap (14) engaging and covering an external surface of the metal pipe (10). The outerwrap (16) is wrapped around the innerwrap (13) and the adhesive impregnated in the outerwrap (16) penetrates the innerwrap (13) and thereby adheres the outerwrap (16) to the innerwrap (13).