Resistive Pipe Connector for Aircraft Fuel Systems Lightning Protection
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Solution Overview
Problem
Traditional metallic tubing systems in aircraft fuel systems are prone to electrical arcing from lightning strikes due to high conductivity, which is hazardous when flammable fluids are present, and existing solutions using non-metallic isolators or resistive materials are expensive and heavy.
Innovation Solution
A pipe connector system using electrically resistive materials, such as PEEK with conductive fillers, and bonding means to provide a predetermined level of electrostatic discharge between conductive pipe means, offering electrical resistance of at least 500 kΩ to 1 MΩ, reducing the risk of arcing while maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional metallic tubing systems are used in aircraft fuel systems, then electrical conductivity is high which allows lightning current to flow, but this creates electrical arcing hazards when flammable fluids are present
Solution Approach 1:
The patent changes the electrical resistance parameter of the pipe connector from metallic (low resistance) to electrically resistive material (high resistance of at least 500 kΩ). This parameter change allows the connector to limit lightning current flow while still providing a controlled path for electrostatic discharge, thereby preventing electrical arcing hazards in flammable fuel systems
Solution Approach 2:
The patent employs composite materials by using electrically resistive materials (such as polymer matrices with conductive fillers like carbon black or metal particles) for the pipe connector body. This composite structure provides both the mechanical strength required for fuel system applications and the controlled electrical resistance properties needed to mitigate lightning strike effects
2Reliability
If non-metallic isolators or highly resistive material sections are used to prevent lightning current flow, then electrical isolation is improved, but the components become expensive and relatively heavy
Solution Approach 1:
The patent optimizes the electrical resistance parameter to a specific range (at least 500 kΩ) that provides sufficient isolation from lightning current while maintaining compatibility with standard aircraft fuel system requirements. This parameter optimization allows the use of lighter resistive materials without compromising safety
Solution Approach 2:
The patent adopts cost-effective electrically resistive materials and standard manufacturing processes that reduce production costs compared to traditional heavy non-metallic isolators. The connector design uses readily available resistive materials and conventional fabrication methods, making the solution more economically viable while maintaining adequate electrical isolation
3Reliability
If non-metallic isolators or highly resistive material sections are used to prevent lightning current flow, then electrical isolation is improved, but the components become expensive
Solution Approach 1:
The patent specifies a practical resistance threshold (at least 500 kΩ) that balances electrical isolation performance with manufacturing feasibility. This parameter specification enables the use of cost-effective resistive materials and standard manufacturing processes rather than requiring expensive specialized materials or complex fabrication techniques
Solution Approach 2:
The patent employs cost-effective electrically resistive materials and standard manufacturing processes that reduce production costs compared to traditional heavy non-metallic isolators. The connector design uses readily available resistive materials and conventional fabrication methods, making the solution more economically viable while maintaining adequate electrical isolation
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 minimizes the risk of electrical arcing in aircraft fuel systems by providing a cost-effective and lightweight means of electrical isolation, ensuring safe operation during lightning strikes.
Implementation Method 1
at least one of the first or second connector elements is formed from electrically resistive material... The or each connector element when formed from the electrically resistive material may be fixed to the respective pipe means using electrically conductive fixing means. The first and second connector elements may provide an electrical resistance of at least 500 KW between the first and second electrically conductive pipe means.
Implementation Method 2
bonding means arranged to enable a predetermined level of electrostatic discharge between the first and second electrically conductive pipe means
Data Source
AI summary
A pipe connector is disclosed, comprising two connector elements, arranged for interconnection of two pipes, wherein one or both of the connector elements is formed from electrically resistive material so as to provide electrical resistance between the connected pipes.