Woven-Fabric Anti-Corrosion Tape for Void-Free Pipe Overlap
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Solution Overview
Problem
Existing anti-corrosion tapes suffer from the formation of creases and cavities in the overlap area, leading to potential leaks and corrosion, particularly in the spiral overlap region, due to inadequate contact between tape layers and the formation of voids.
Innovation Solution
An anti-corrosion tape comprising a bonding ply made of butyl rubber and polyisobutylene, with a bidirectional woven fabric embedded in it, having specific ratios of bending stiffness in different directions to ensure tight adherence and minimize voids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional anti-corrosion tapes are wrapped around pipes to provide corrosion protection, then corrosion protection is achieved, but creases and cavities form in the overlap area leading to leaks and spiral corrosion
Solution Approach 1:
The patent changes the physical parameters of the tape by incorporating a woven fabric reinforcement layer with specific bending stiffness characteristics. The fabric layer has a bending stiffness ratio between 1:2 and 1:10 (transverse to longitudinal), which fundamentally alters the tape's mechanical behavior during wrapping, preventing crease and cavity formation while maintaining corrosion protection effectiveness.
Solution Approach 2:
The patent creates a composite structure by embedding a woven fabric reinforcement layer within the bonding ply of the anti-corrosion tape. This composite design combines the corrosion-inhibiting properties of the bonding material with the mechanical strength and dimensional stability of the woven fabric, eliminating the harmful effects of creases and cavities during application.
2Reliability
If anti-corrosion tape is applied to pipes, then corrosion protection is provided, but the tape forms wrinkles that create points of attack for forces during handling and operation
Solution Approach 1:
The woven fabric reinforcement layer embedded in the bonding ply creates a composite structure that provides both corrosion protection and mechanical strength. The fabric's high tensile strength and dimensional stability prevent wrinkle formation, making the tape resistant to forces encountered during pipe handling and operation while maintaining its corrosion-inhibiting function.
Solution Approach 2:
The incorporation of the woven fabric fundamentally changes the mechanical parameters of the tape, particularly its bending stiffness and tensile strength. These parameter changes enable the tape to maintain a smooth, wrinkle-free appearance during application and service, eliminating weak points that would otherwise be vulnerable to handling forces.
3Reliability
If conventional tapes are used for pipe covering, then basic protection is achieved, but voids form adjacent to tape edges reducing sealing effectiveness
Solution Approach 1:
The patent modifies the mechanical parameters of the tape by embedding a woven fabric with controlled bending stiffness. This changes how the tape conforms to the pipe surface and overlaps with adjacent turns, eliminating void formation at tape edges and ensuring continuous, tight coverage that maintains sealing effectiveness throughout the pipe system.
Data Source
AI summary
The present invention relates to an anti-corrosion tape, in particular for producing a pipe covering, comprising at least one bonding ply, produced from a material selected from the group including at least one butyl rubber and/or at least one polyisobutylene, at least one bidirectional woven fabric being at least partially embedded in the at least one bonding ply.