Coated Expandable-Contractible Flexible Pipe Corrosion Protection
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Solution Overview
Problem
Expandable-contractible flexible pipes embedded in corrosive soil, such as coastal reclaimed land, face risks of rust due to pinholes or cracks, which compromise their anti-corrosive coating during oscillation or expansion/contraction.
Innovation Solution
A coated expandable-contractible flexible pipe design featuring a resin or rubber coating with a joint coating portion, a pipe coating portion, and a looseness portion that allows for oscillation or expansion, with radial flanges on the joint's outer surface to maintain contact and prevent coating detachment, ensuring anti-corrosive performance even under ground subsidence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the expandable-contractible flexible pipe is coated with a resin or rubber coating to improve anti-corrosiveness, then the anti-corrosive performance is improved, but the coating may be broken during oscillation or expansion/contraction
Solution Approach 1:
The coating is divided into multiple segments: a joint coating portion covering the joint, a pipe coating portion covering the connecting pipe, and a looseness portion between them. This segmentation allows each part to perform its specific function - the joint coating portion provides corrosion protection at the joint, the pipe coating portion protects the pipe, and the looseness portion accommodates movement without breaking the coating.
Solution Approach 2:
The looseness portion is designed to be dynamic rather than rigid, allowing it to expand and contract along with the pipe's oscillation and expansion/contraction movements. This dynamic design enables the coating to follow the pipe's movements without breaking, maintaining coating integrity while preserving anti-corrosive performance.
2Reliability
If the coating is made tight to the joint to prevent corrosion, then the anti-corrosive performance is improved, but the coating cannot accommodate oscillation or expansion/contraction
Solution Approach 1:
The coating is segmented into a joint coating portion that is tight to the joint for corrosion protection, and a looseness portion that provides adaptability for movement. This segmentation allows the coating to simultaneously achieve both tight adhesion where needed and flexibility where movement occurs.
Solution Approach 2:
Different portions of the coating have different properties: the joint coating portion and pipe coating portion are designed for tight adhesion to provide corrosion protection, while the looseness portion is designed with loose fit to accommodate movement. This local differentiation of coating properties allows the coating system to satisfy both contradictory requirements in different locations.
3Stability of the object's composition
If flanges are formed on the joint outer surface to maintain coating contact, then the coating stability is improved, but the manufacturing complexity increases
Solution Approach 1:
The flanges are integrated directly into the joint structure during manufacturing, merging the coating contact function with the joint's structural components. This integration allows the flanges to maintain coating contact stability without requiring separate additional parts, thereby reducing overall manufacturing complexity while achieving the desired coating stability.
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
Provided is a coated expandable-contractible flexible pipe such that even if the expandable-contractible flexible pipe covered by coating deflects, expands, or contracts, the coating is not damaged and anti-corrosion properties can be suitably ensured. The coated expandable-contractible flexible pipe comprises: an expandable-contractible flexible pipe that has a pair of joints (1) for connecting to a fluid pipe and a connecting pipe (3) connecting the joints (1) and that is configured so that the pair of joints (1) can mutually deflect and expand and contract; and a resin or rubber coating (5, 105, 205, 305) that covers the expandable-contractible flexible pipe. The coating has: joint coating sections (50, 150, 250, 350) that adhere to the joints; a pipe coating section (51, 151, 251, 351) that adheres to the connecting pipe (3); and a play section (52, 152, 252, 352) that is provided between the joint coating sections (50, 150, 250, 350) and the pipe coating section (51, 151, 251, 351) and that allows the expandable-contractible flexible pipe to deflect or expand and contract.