Pipeline Liner Coupling Joint for Fluid-Tight Rehabilitation
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Solution Overview
Problem
Current methods for rehabilitating pipelines with liners of reinforcing fibers and curable resin compositions are inefficient and unreliable, particularly in creating a fluid-tight connection between the liner and pipeline elements, which can compromise the long-term performance of the rehabilitated pipeline.
Innovation Solution
A method involving a coupling member with a substantially fully cured resin composition and an alignment device with first and second alignment elements to axially align the host pipe and coupling member, allowing for a secure and fluid-tight connection by exposing the curable resin composition and curing it to form a functional joint between the coupling member and the liner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If welding steel flanges to host pipe ends and using internal rubber seals is used to connect liners to pipeline elements, then a fluid-tight connection can be achieved, but the process becomes time-consuming and requires expert workers
Solution Approach 1:
The coupling member is pre-formed with integrated connection features including alignment elements and curing surfaces, eliminating the need for on-site welding and sealing operations. The resin composition is prepared in advance to ensure proper bonding characteristics during installation.
Solution Approach 2:
The invention combines multiple functions into a single coupling member: alignment functionality, structural connection, and fluid-tight sealing are all integrated into one component that connects directly to the liner without requiring separate flanges and rubber seals.
2Strength
If welding steel flanges to host pipe ends is used to connect liners, then a mechanical connection can be achieved, but the connection relies on the remaining strength of the damaged host pipe which cannot guarantee long term performance
Solution Approach 1:
Instead of relying on the damaged host pipe structure, the invention creates a new structural connection through the coupling member that bonds to the liner material itself, effectively copying the structural integrity function without depending on the compromised host pipe.
Solution Approach 2:
The invention changes the connection mechanism from mechanical welding to chemical bonding through resin curing, transforming the connection strength parameters to rely on adhesive bonding properties rather than the mechanical strength of damaged pipe ends.
3Manufacturing precision
If alignment devices with mating surfaces are used to axially align host pipe and coupling member, then precise alignment can be achieved, but the device complexity increases
Solution Approach 1:
The coupling member serves multiple functions simultaneously: it provides structural connection, ensures axial alignment through integrated alignment elements, and creates fluid-tight sealing. This multi-functionality reduces the need for separate alignment devices.
Solution Approach 2:
The alignment functionality is localized to specific features on the coupling member such as alignment elements and mating surfaces, rather than requiring a complex overall alignment device. The precision is achieved through local geometric features.
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
This method provides a more efficient and reliable rehabilitation process, ensuring a strong and long-lasting connection between the liner and pipeline elements, enhancing the extended working life of the rehabilitated pipeline.
Implementation Method 1
exposing the curable resin composition of the liner in a joining section of the liner; curing the curable resin composition of the liner to form a functional joint
Data Source
AI summary
A method for rehabilitating a pipeline with a liner includes providing a coupling member to connect a liner to a pipeline element. A first alignment element is connected to an end of the host pipe and a second alignment element to an end of the coupling member to axially align both components. A length of the liner is provided through the pipe and the coupling member to expose a joining section of the liner outside the pipe. The coupling member is brought towards the pipe such that the first and second alignment elements mate and the joining section of the liner is received in the coupling member. The joining section of the liner is pressurized to engage an interior surface of the coupling member, and a curable resin composition of the liner is cured to form a functional joint between the coupling member and the liner joining section.