Protective Sheath with Intumescent Gaps for Heat Dissipation
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Solution Overview
Problem
Existing fire protection methods for structural components, such as vessels and piping systems, often result in heat retention rather than dissipation, which is undesirable for components carrying hot fluids like petroleum products at high temperatures, and lack effective protection against mechanical impact, vibration, abrasion, and UV exposure.
Innovation Solution
A protective sheath is designed with an air space between the structural component and the sheath, featuring gaps for heat dissipation through a chimney effect, and intumescent adhesive material that expands to close gaps during fires, providing both heat dissipation and fire protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulation materials are installed around the pipe or equipment for fire protection, then fire protection capability is improved, but heat retention increases which is undesirable for components carrying hot fluids
Solution Approach 1:
The protective system is segmented into multiple functional layers: an outer protective sheath providing fire protection and UV resistance, and an inner structural component carrying the hot fluid. The air gap between these layers segments the thermal pathways, allowing the outer layer to provide fire protection while the inner layer maintains its temperature for hot fluid transport.
Solution Approach 2:
An air gap is introduced as an intermediary layer between the protective sheath and the structural component. This air gap acts as a thermal buffer that prevents direct heat transfer from the hot fluid to the protective sheath, allowing fire protection without excessive heat retention.
2Reliability
If a protective sheath is installed around the structural component, then protection from fire exposure, mechanical impact, vibration abrasion, and UV light is improved, but heat dissipation capability deteriorates
Solution Approach 1:
The protective sheath is designed with localized openings at the top and bottom that create a chimney effect. This local modification allows heat dissipation through controlled air flow paths while the majority of the sheath surface maintains its protective function against fire, impact, and UV exposure.
Solution Approach 2:
The protective sheath incorporates intumescent material that changes its physical parameters in response to temperature. At normal temperatures, the material maintains a porous structure allowing heat dissipation. When exposed to fire temperatures, the material expands and closes the gaps, transforming from a heat-dissipating structure to a fire-resistant barrier.
3Loss of energy
If gaps are provided in the protective sheath for heat dissipation, then heat dissipation capability is improved, but fire protection capability deteriorates when fire exposure occurs
Solution Approach 1:
The protective sheath incorporates dynamic gaps that change their state based on temperature conditions. During normal operation, the gaps remain open to allow heat dissipation through the chimney effect. During fire exposure, the intumescent material expands and dynamically closes the gaps, transforming the structure from a heat-dissipating configuration to a fire-resistant sealed configuration.
Solution Approach 2:
The intumescent material in the protective sheath undergoes parameter changes when exposed to fire temperatures. The material expands significantly, changing the gap dimensions from open to closed, and transforms from a heat-dissipating structure to a fire-resistant barrier that maintains structural integrity during fire exposure.
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 dissipates heat from structural components while maintaining fire protection, keeping the outer surface temperature significantly lower than the process fluid and preventing fire damage, meeting fire endurance standards.
Implementation Method 1
dissipating heat build-up by creating a chimney effect from air drawn in through the first opening, passing through the air space over the structural component and exiting out the second opening
Implementation Method 2
the intumescent material is heated to an elevated temperature between 300 to 1200° F., the material fully expands to effectively close the gaps and protect the composite pipe from the fire
Data Source
AI summary
A structural component system for containing a hot fluid, e.g., petroleum product, and methods to dissipate heat build-up in the structural component is disclosed. In one embodiment, the structural component is a composite pipe for carrying a hot fluid, e.g., petroleum products. The system comprises a protective sheath disposed around the structural component and forms an air space between the structural component and the sheath. The sheath has at least two gaps on its surface, with the gaps being sufficiently spaced apart to allow air flowing through the air space from one gap to another to dissipate heat build-up from the hot fluid contained within the structural component. In one embodiment, an intumescent material is applied near the gaps, which material expands when heated to a temperature in a fire to effectively close the gaps and protect the structural component from the fire.