Thermoplastic Pipe Compression and Fiber Embedding
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Solution Overview
Problem
Current HDPE piping systems for fluid and gas transport are heavy, costly, and require cooling for contraction, leading to inefficiencies in installation and leakage issues, making them unsuitable for high-pressure applications in rough terrains and environmentally sensitive areas.
Innovation Solution
A method involving mechanical compression of thermoplastic pipes followed by wrapping with continuous taut fiber tapes, which are then heated to create a homogenous bond, allowing for lightweight, durable, and leak-resistant pipes that can withstand high pressures without cooling, and can be easily transported and installed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thick-walled HDPE pipes are used to ensure integrity under high pressure, then durability is improved, but weight increases significantly and cost increases nearly 3 times compared to aluminum pipes
Solution Approach 1:
The patent applies composite materials by combining thermoplastic pipe material with fiber reinforcement layers (such as fiberglass or carbon fiber) wrapped around the pipe. This composite structure provides high strength-to-weight ratio, achieving the durability of thick-walled pipes while maintaining lightweight characteristics. The fiber layers bear the mechanical stress, allowing the pipe wall itself to be thinner and lighter.
Solution Approach 2:
The patent applies local quality by reinforcing specific areas of the pipe with fiber tapes rather than uniformly thickening the entire pipe wall. The fiber reinforcement is applied circumferentially at critical stress zones, providing localized strength enhancement where needed while keeping the overall pipe weight low. This selective reinforcement strategy achieves high durability without the weight penalty of uniformly thick-walled construction.
2Strength
If thick-walled HDPE pipes are used to ensure integrity under high pressure, then durability is improved, but the pipes become difficult to transport in rough terrains and require trucks or mechanical movers
Solution Approach 1:
The composite construction with fiber reinforcement provides exceptional strength-to-weight ratio, enabling the pipe to be both durable and lightweight. This allows manual handling and transport in rough terrains without requiring heavy mechanical equipment, directly resolving the transport difficulty associated with thick-walled pipes.
3Shape
If cooling HDPE pipe from ambient to near freezing temperatures is used to induce thermal contraction, then pipe contraction is achieved, but substantial amounts of energy and equipment are required and condensation of water vapor forms on the pipe surface
Solution Approach 1:
The patent changes the physical parameter approach from thermal contraction to mechanical compression. Instead of cooling the pipe to induce contraction, a mechanical compression device is used to directly compress the pipe to the desired diameter. This eliminates the need for substantial cooling energy and equipment while avoiding condensation issues entirely.
4Shape
If mechanical compression device is used to contract the pipe, then pipe contraction is achieved without cooling, but the pipe must be heated to embed fibers into the pipe surface
Solution Approach 1:
The patent utilizes phase transition (melting) of the thermoplastic material during heating. The heat source temporarily raises the pipe surface temperature above the melting point of the thermoplastic, allowing fiber embedding. After cooling, the material solidifies and locks the fibers in place, creating a strong composite structure. This controlled phase transition enables fiber integration without requiring permanent temperature changes.
5Ease of manufacture
If butt fusing systems are used to join thick-walled pipes, then pipe connections are achieved, but the process is time consuming and requires heavy equipment to be transported to the installation site
Solution Approach 1:
The lightweight composite pipe construction enables the use of simpler, faster joining methods compared to thick-walled pipes. The fiber-reinforced structure allows for efficient connection techniques that do not require heavy equipment or lengthy processes, significantly reducing installation time and equipment requirements while maintaining connection integrity.
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 results in a piping system that is lighter, more durable, and less prone to leakage, facilitating easier installation and transportation, while reducing environmental impact and costs, and enabling high-pressure fluid and gas transport with minimal support structures.
Implementation Method 1
contracting a thermoplastic pipe using a mechanical compression device
Implementation Method 2
warming the first fiber tape and pipe using a second heat source
Implementation Method 3
embedding taut fibers into the pipe as the pipe is warmed
Implementation Method 4
After mechanical compression, the pipe will naturally expand and apply pressure against the restraint provided by the tape
Implementation Method 5
bonding the first fiber tape to the pipe as the tape and pipe reach a thermal equilibrium
Data Source
AI summary
An apparatus for manufacturing pipes using thermoplastic pipe and “tape” (continuous fiber, fully wetted in a similar thermoplastic as the pipe) that embeds its fibers into pipe surface. The thermoplastic pipe is mechanically compressed prior fiber tape being applied. Outer diameter reduction of the pipe is at least partly maintained by the fiber tape being tightly wrapped around the pipe immediately after compression causes the pipe to contract. Then, an external heat source is applied to the pipe causing the thermoplastic to melt and the pipe to undergo thermal expansion. Fibers stretch less and are embedded into the molten layer of the pipe, creating a permanent bond between the fibers and the pipe. Individual pipes may be joined using couplers or butt welds.