Inert Gas Fire Suppression Pressure Control
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Solution Overview
Problem
Inert gas fire suppression systems face challenges in managing high peak pressures during gas discharge, which can cause structural damage and require expensive, heavy-duty piping to withstand these pressures, and existing solutions have complex discharge valve structures.
Innovation Solution
A system with fluid discharge control means positioned between pressurized inert gas containers and the target zone, which reduces downstream pressure without referencing upstream pressure, using time-dependent or pressure-dependent operation to maintain constant or reduced pressure levels, and employs multiple flow paths with varying restrictors to distribute pressure peaks over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If inert gas is stored in pressurised containers and discharged rapidly to deliver 95% of required amount within sixty seconds, then fire suppression effectiveness is improved, but peak pressure in the piping network increases causing structural damage risk and requiring expensive heavy-duty piping
Solution Approach 1:
The system divides the single high-pressure discharge into multiple sequential discharge stages by splitting the gas flow path into multiple branches with different restrictors. Each branch discharges gas at a controlled rate, segmenting the total discharge volume over time. This segmentation reduces the peak pressure in the common piping while maintaining the overall productivity requirement of delivering 95% of required gas within 60 seconds.
Solution Approach 2:
The system employs periodic discharge action through multiple flow paths with varying restrictor sizes, creating a staged discharge pattern. Different branches activate and discharge at different rates, creating a periodic flow pattern that smooths out pressure peaks. This periodic action allows the system to maintain high overall discharge rates while avoiding sustained high peak pressures that would require heavy-duty piping.
2Stress or pressure
If a complex discharge valve structure is used to control flow rate in dependence upon pressure variations, then pressure control is improved, but device complexity increases
Solution Approach 1:
The invention extracts the pressure control function from the discharge valve itself and relocates it to the flow path restrictors and manifold design. Instead of using complex pressure-sensitive valves, the system uses passive flow restriction elements that inherently control discharge rates based on their geometry. This takes out the active control mechanism and replaces it with passive flow management, reducing device complexity while maintaining pressure control.
Solution Approach 2:
The system employs self-regulating flow restrictors that automatically adjust flow rates based on pressure differentials without requiring external control signals or complex valve mechanisms. Each restrictor inherently responds to pressure variations by adjusting flow through its fixed geometry, allowing the system to self-regulate discharge rates. This self-service approach eliminates the need for complex pressure-sensitive discharge valves while maintaining effective pressure control.
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
This solution reduces peak pressures in the piping network, allowing for lighter and less expensive piping, while maintaining effective fire suppression by distributing pressure peaks, thereby minimizing structural damage and operational costs.
Implementation Method 1
fluid discharge control means for being positioned in a fluid flow path between a pressurised inert gas supply and a target fire suppression zone for reducing the pressure in the fluid flow path downstream of the fluid discharge control means
Data Source
AI summary
A system for discharging inert gas for extinguishing or suppressing a fire is disclosed. A fluid discharge control arrangement is positioned in a fluid flow path between a pressurised gas supply 10A,10B,10C and the target fire suppression zone 20. The fluid discharge control arrangement reduces the pressure in the fluid flow path downstream thereof. This may allow the downstream pipework to be selected to withstand a lower pressure than in a conventional system in which the fluid discharge control device was not provided, thereby reducing costs. The fluid discharge control device may comprise a first valve 30 and first restrictor 26 in the first flow path 22 and a second valve 32 and a second restrictor 28 provided in the second flow path 24. Fluid from the containers 10A,10B,10C flows initially through flow path 24 and restrictor 26. Subsequently flow path 22 may be closed by optional valve 30, and flow path 24 is opened by valve 32. Fluid flow then passes through restrictor 28. This reduces the peak pressure in the downstream pipework 34. In another embodiment the discharge of inert gas from the containers 10A,10B and 10C is staggered to reduce the peak pressure in pipeline 34. A further embodiment provides a restrictor in the inlet 14A,14B,14C from each of the containers 10A,10B,10C to the manifold 16, thereby also reducing the peak pressure in the pipeline 34.