CSST Tubing Lightning Protection with TVS and Spark Gap
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Solution Overview
Problem
Corrugated stainless steel tubing (CSST) is susceptible to electrical injuries from lightning strikes due to its conductive nature, which can lead to punctures, fires, or explosions, despite being designed for gas supply, and existing solutions like separate shunt layers are not effectively isolated from the tubing.
Innovation Solution
A gas tubing system with a conductive layer insulated from the fluid conduit, featuring connectors that include a spark gap and an energy dissipation circuit with a fuse and transient voltage suppression (TVS) device to divert electrical energy safely to ground, indicating electrical insults without visual inspection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CSST is used for gas supply, then gas transport function is achieved, but electrical injury susceptibility increases due to conductive nature
Solution Approach 1:
The patent introduces an insulating layer as an intermediary between the conductive CSST and the external environment. This insulating layer acts as a mediator that blocks electrical charge transfer from lightning strikes to the tubing, while still allowing the tubing to perform its gas transport function. The insulating layer is applied to the outer surface of the CSST, creating a protective barrier that prevents direct electrical contact.
2Object-affected harmful factors
If separate shunt layer is added to protect from electrical insults, then electrical protection is improved, but device complexity increases
Solution Approach 1:
The patent extracts the electrical protection function from the main tubing structure by applying a separate insulating layer on the outer surface. This extracted protective layer handles electrical insult mitigation independently, allowing the CSST to maintain its simple gas transport function. The insulating layer can be applied as a coating or wrap, adding protection without fundamentally altering the tubing's core structure or requiring complex multi-layer construction.
3Object-affected harmful factors
If conductive layer is electrically isolated from tubing, then electrical injury mitigation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by providing electrical insulation only where it is most needed - on the outer surface of the CSST where lightning strikes would first contact the tubing. The insulating layer is applied selectively to the exterior surface, ensuring electrical charge isolation at the critical interface with the environment, while the inner gas transport surface maintains its original properties. This localized approach reduces manufacturing complexity compared to requiring complete uniform insulation throughout the tubing wall.
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 system effectively mitigates electrical insults by dissipating energy and providing indication of electrical injuries, protecting the tubing from damage and ensuring safety without requiring full-length visual inspection.
Implementation Method 1
an energy dissipation circuit with a fuse and transient voltage suppression (TVS) device to divert electrical energy safely to ground
Implementation Method 2
connectors that include a spark gap and an energy dissipation circuit
Data Source
AI summary
Apparatus for detecting an electrical insult to a gas tubing system and dissipating the energy from such insult. The system includes tubing and an injury mitigator. The tubing includes a conduit, an insulating layer, a conductive layer, and a jacket. The conduit is connected to earth ground. The conductive layer is electrically insulated from the conduit by the insulating layer. The mitigator includes an insult event detection circuit and an energy dissipation circuit, both electrically connected between the conductive layer of the tubing and ground. Insult indication is provided by a fusible link. Energy dissipation is provided by the fuse, a transient voltage suppression (TVS) device, and/or a spark gap. The TVS device has a setpoint voltage less than the breakdown voltage of the spark gap, ensuring that the TVS device actuates before the spark gap conducts.