Fire-Resistant Pipe Coupling with Mica Insulation
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Solution Overview
Problem
Existing fire-resistant pipe couplings fail to meet higher marine standards for withstanding flame temperatures and pressure due to gasket material degradation, and additional insulation methods are impractical and costly.
Innovation Solution
A pipe coupling design featuring a tubular casing with fire-resistant and thermally-insulating materials, where mica paper is used for thermal insulation and silica-based fire-resistant materials, allowing for improved thermal and fire protection without external insulation, enabling the coupling to withstand high temperatures and pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coupling uses standard rubber gasket material, then it provides good sealing and flexibility, but the gasket reaches critical temperature (300°C) too quickly during fire exposure and fails
Solution Approach 1:
The patent introduces mica paper as an intermediary thermal insulation layer between the gasket and the inner casing. This mediator prevents direct heat transfer from the fire-exposed outer casing to the gasket, keeping the gasket temperature below the critical 300°C threshold even during extended fire exposure. The mica paper acts as a thermal barrier that protects the sealing element without compromising the coupling's fire resistance rating.
Solution Approach 2:
The coupling is segmented into distinct thermal zones: the outer casing exposed to fire, the fire-resistant material layer, the inner casing, the mica paper insulation layer, and the gasket. This segmentation allows each component to perform its specific function - the outer casing provides structural integrity under fire, while the gasket maintains sealing in a protected thermal environment.
2Reliability
If additional fire-shielding materials (mineral wool, fire-shielding fabrics) are wrapped around the coupling, then fire protection is improved, but the solution becomes extremely expensive and impractical to install
Solution Approach 1:
The patent merges the fire-shielding function and thermal insulation function into integral components of the coupling structure itself. The fire-resistant material is incorporated into the casing construction, and the mica paper is placed inside the casing during manufacturing. This eliminates the need for separate post-installation wrapping operations and makes the fire protection inherent to the coupling design.
Solution Approach 2:
The thermal insulation and fire-resistant materials are pre-installed within the casing structure during manufacturing, before the coupling is shipped and installed. This preliminary action ensures that the fire protection is already in place and correctly positioned, eliminating the need for complex on-site installation of additional shielding materials.
3Reliability
If both fire-shielding and thermal insulation materials are used in known couplings, then some fire protection is achieved, but the overall coupling size increases and costs increase
Solution Approach 1:
The patent applies different material properties in different locations: fire-resistant material is used in the outer casing where direct fire exposure occurs, while thin mica paper thermal insulation is used internally where heat transfer to the gasket must be prevented. This localized application of material properties provides effective fire protection without uniformly increasing the coupling dimensions throughout.
Solution Approach 2:
The coupling employs composite construction with multiple material layers: the outer casing material provides fire resistance, the mica paper provides thermal insulation, and the gasket material provides sealing. This composite approach allows each material to be optimized for its specific function while maintaining a compact overall size.
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 coupling effectively withstands 800°C flames for extended periods and high internal pressures, reducing the risk of material failure and allowing for smaller diameters while maintaining installation ease and cost-effectiveness.
Implementation Method 1
at least one layer of thermally-insulating material disposed between the tubular sealing gasket and the inner casing
Implementation Method 2
at least one layer of fire-resistant material disposed between the inner and outer casings
Data Source
AI summary
The present invention relates to fire-resistant pipe couplings (100) for connecting together two plain-ended pipes in a fluid-tight manner. The pipe coupling (100) comprises: a tubular casing comprising: an outer tubular casing (102); and an inner tubular casing (104), fitting entirely inside the outer casing (102); a tubular sealing gasket (106) disposed within the inner tubular casing (104); and means (116) for tensioning the casing around the gasket (106). The casing further comprises: at least one layer of fire-resistant material (124) disposed between the inner (104) and outer (102) casings; and at least one layer of thermally-insulating material (128) disposed between the tubular sealing gasket (106) and the inner casing (104), whereby the outer casing (102) and tubular sealing gasket (106) are thermally insulated from one another.