Nested Pipe Fire Retardant Delivery for Demising Wall Openings
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Solution Overview
Problem
Openings in demising walls pose a challenge for fire prevention as they provide an easy path for fire to spread, and existing methods struggle to effectively seal multiple service conduits with fire retardant materials.
Innovation Solution
A fire prevention apparatus comprising an inner pipe with perforations and an outer pipe with a slit or end portions that compress to deliver fire retardant through the perforations, ensuring a complete seal within the inner pipe, either through internal spring forces or external compression, or using fittings for manual delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If openings are created in demising walls for service conduits, then services can be provided throughout the building, but fire can spread more easily through the demising wall
Solution Approach 1:
The fire prevention apparatus uses nested pipes where an inner pipe is positioned within an outer pipe. The inner pipe contains service conduits while both pipes are coated with fire retardant material. This nested structure allows service provision through the demising wall while maintaining fire separation, as the fire retardant coating on both pipes prevents fire spread through the opening.
2Object-affected harmful factors
If fire retardant material is applied to seal openings, then fire spread is prevented, but it is difficult to ensure complete coverage of multiple service conduits
Solution Approach 1:
The fire prevention apparatus applies fire retardant material locally to critical surfaces - specifically coating the outer pipe and inner pipe separately. This ensures that each pipe surface is completely covered with fire retardant material, addressing the specific need for complete coverage on service conduits while allowing other areas to have different treatment.
Solution Approach 2:
The apparatus is pre-coated with fire retardant material before installation in the demising wall. This preliminary application of fire retardant ensures complete coverage is achieved during manufacturing rather than requiring difficult post-installation application, solving the problem of ensuring complete fire retardant coverage on multiple conduits.
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 apparatus effectively seals the inner pipe, preventing fire spread by ensuring complete coverage with fire retardant, even in complex conduit installations, thereby enhancing fire safety in commercial buildings.
Implementation Method 1
The outer pipe is configured to compress when a force is applied to the outer pipe, so as to cause the fire retardant to pass through the perforations into the inner pipe
Data Source
AI summary
A fire prevention apparatus includes an inner pipe having multiple perforations along a length of the inner pipe. The fire prevention apparatus also includes an outer pipe surrounding the inner pipe, the outer pipe having a slit along a length of the outer pipe. The fire prevention apparatus also includes fire retardant disposed in a gap between the inner pipe and the outer pipe. The outer pipe is configured to compress when a force is applied to the outer pipe, so as to cause the fire retardant to pass through the perforations into the inner pipe.