Overhaul Line System with Flow Control Valve
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Solution Overview
Problem
Conventional firefighting nozzles discharge excessive water, causing unnecessary damage, risking firefighter safety, and destroying evidence, as they are not suited for post-fire smoldering debris extinguishment and investigation.
Innovation Solution
An overhaul line system with a manifold and quick connect couplings, allowing connection of a smaller diameter hose with a flow control valve and elongated nozzle, reducing water discharge to 5-10 gallons per minute, attached to the main line, to manage hot spots without shutting down the main line, and minimize evidence destruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional attack nozzle is used to extinguish smoldering debris, then the fire can be suppressed, but excessive water damage occurs and evidence is destroyed
Solution Approach 1:
The system segments the firefighting function into two distinct components: a main attack nozzle for initial fire suppression and a separate overhaul line for smoldering debris extinguishment. This segmentation allows each component to be optimized for its specific function, with the overhaul line delivering reduced water flow (5-10 gpm) appropriate for post-fire overhaul operations, thereby minimizing water damage while maintaining effective fire suppression capability
Solution Approach 2:
The overhaul line system changes the water flow parameter from the high flow rate (50-150 gpm) of conventional attack nozzles to a reduced flow rate (5-10 gpm) suitable for extinguishing smoldering debris. This parameter change is achieved through the smaller diameter hose (1/2 to 1 inch) and flow control valve, which together deliver the precise water quantity needed to extinguish hot spots without causing excessive water damage or destroying evidence
2Reliability
If a high pressure fire hose is used during overhaul operations, then firefighter safety is maintained, but the hose becomes heavy and difficult to maneuver
Solution Approach 1:
The system divides the firefighting apparatus into a main high-pressure line for firefighter safety and a separate lightweight overhaul line for maneuverability. The overhaul line, being smaller in diameter and weight, can be easily handled and positioned by firefighters to access hard-to-reach areas containing smoldering debris, while the main line remains available to provide safety backup if needed
Solution Approach 2:
The overhaul line provides partial water flow capability (5-10 gpm) that is sufficient for overhaul operations without requiring the full power of the main high-pressure line. This partial action approach allows firefighters to use a lighter, more maneuverable hose for the specific task of extinguishing smoldering debris while maintaining the option to switch to the full-capacity main line if fire conditions worsen
3Reliability
If an attack nozzle is used for prolonged periods, then complete fire extinguishment is ensured, but time is wasted and property damage increases
Solution Approach 1:
The system changes the operational parameters by switching from high flow rate attack nozzle operations to reduced flow rate overhaul line operations once the main fire is suppressed. This parameter change allows firefighters to efficiently extinguish smoldering debris with minimal water application, reducing both the time required for overhaul operations and the associated water damage to property
Solution Approach 2:
The overhaul line delivers partial water flow (5-10 gpm) that is precisely sufficient for extinguishing smoldering debris without the excessive water application of attack nozzles. This partial action approach enables firefighters to complete overhaul operations more quickly and with less water damage, while still ensuring complete fire extinguishment by targeting specific hot spots and smoldering areas
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
Substantially reduces water damage, enhances firefighter safety by reducing hose handling stress, and preserves evidence by using significantly less water, allowing effective smoldering debris extinguishment and investigation without the need for high-pressure hoses.
Implementation Method 1
a flow control valve to regulate the flow of water through the line at a rate of approximately 10 gallons per minute
Data Source
AI summary
An overhaul line system includes a manifold that is attachable to, or formed integral with an attack nozzle. The manifold provides at least one quick connect coupling that allows an overhaul line to be connected to the manifold and to receive fire suppressing fluid from that manifold into a hose. The overhaul line has an elongated nozzle at its end remote from the quick connect coupling. A flow control valve is interposed between the elongated nozzle and the remote end of the overhaul line. A water treatment cartridge container can also be situated adjacent the flow control valve.