Polymeric Venting Apparatus for Lined Pipe Corrosion
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Solution Overview
Problem
Gases permeating through plastic liners in metal pipes can cause deterioration and corrosion at the interface between the liner and the pipe, and existing venting methods that drill holes in the metal pipe are susceptible to further corrosion and inefficient gas release.
Innovation Solution
A venting apparatus with a polymeric material, such as polytetrafluoroethylene, is inserted through a hole in the metal pipe without puncturing the liner, featuring a base portion that deforms slightly to create a spacing and channels to direct gases to a central passage extending through the pipe wall for external venting, preventing corrosion and ensuring effective gas release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a hole is drilled through the metal pipe wall to vent gases, then gas release is enabled, but the hole becomes susceptible to corrosion and limits effective gas release
Solution Approach 1:
A polymeric venting apparatus is introduced as an intermediary component between the corrosive gases and the metal pipe wall. The apparatus includes a receiving portion with channels that direct gases to an exhaust portion, creating a barrier that prevents direct contact between corrosive gases and the metal pipe, thereby eliminating corrosion at the venting location while maintaining effective gas release
Solution Approach 2:
The venting apparatus is made from polymeric material that combines multiple functional elements (receiving portion, channels, exhaust portion) into a composite structure. This composite material provides both the gas venting function and corrosion resistance, solving the contradiction between gas release efficiency and corrosion resistance
2Stability of the object's composition
If the plastic liner is left intact without puncturing, then liner integrity is maintained, but gases accumulate at the interface and cause deterioration
Solution Approach 1:
The venting apparatus segments the gas flow path into distinct components: a receiving portion with multiple channels that interface with the liner, and an exhaust portion that extends through the pipe wall. This segmentation allows gases to be collected and directed without requiring a puncture through the liner, maintaining liner integrity while enabling gas removal
Solution Approach 2:
The venting apparatus serves as an intermediary structure that interfaces with the intact plastic liner through its receiving portion. The channels within the apparatus provide a controlled pathway for gases to travel from the interface area to the exhaust portion, preventing gas accumulation and deterioration while keeping the liner puncture-free
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 effectively removes accumulating gases from the interface, preventing metal pipe corrosion and ensuring efficient venting of gases to the exterior atmosphere, thereby maintaining the integrity of the pipe and liner.
Implementation Method 1
The base portion of the vent that is disposed in the interface may cause the plastic liner to deform slightly inward and create a spacing in the interface around the base portion, which may assist with drawing gases to the lower pressure area formed by the vent
Implementation Method 2
gases may migrate or permeate to an interface between the liner and the pipe
Data Source
AI summary
A venting system includes a vent for expelling gases that accumulate between a metal pipe and a plastic liner disposed within the metal pipe. The vent includes a base portion that is configured to be disposed between the plastic liner and a wall of the metal pipe. The base portion has at least one channel extending along the base portion to a central region of the base portion. The vent includes an exhaust portion that protrudes from the central region of the base portion and is adapted to extend through the wall of the metal pipe. The exhaust portion has a central passage that interconnects with the at least one channel of the base portion, such that the vent is configured to vent gases from an interface area between the plastic liner and the wall of the metal pipe to an exterior atmosphere outside the metal pipe.