Tunnel Deluge Nozzle Testing Using Pressurized Air Flow
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Solution Overview
Problem
Conventional testing methods for tunnel fire suppression systems, such as water deluge systems, require wet tests that involve significant time, expense, and exposure to water, leading to corrosion, equipment damage, and operational disruptions, while also posing risks to personnel and environmental impact.
Innovation Solution
A method and apparatus using pressurized air to test the water deluge system by measuring air pressure and flow rate at outlets, eliminating the need for wet tests and reducing exposure to water, thereby minimizing corrosion, equipment damage, and operational disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wet testing is performed to test the water deluge system, then the system can be tested for blocked or restricted nozzles, but significant time is required and normal operations are restricted
Solution Approach 1:
The patent uses air as a substitute fluid to copy the flow pattern and pressure characteristics of water through the deluge system. By measuring air pressure at multiple points and comparing with computer-generated expectations, the system identifies blocked or restricted nozzles without actually dispensing water, thus avoiding the time loss of wet testing while maintaining testing accuracy.
Solution Approach 2:
The patent replaces the mechanical water delivery system with an air pressure measurement system. Instead of physically dispensing water through the nozzles, the system uses air pressure sensors to indirectly measure nozzle performance, substituting a complex mechanical water handling process with a simpler pneumatic measurement approach.
2Reliability
If wet testing is performed to test the water deluge system, then the system condition can be verified, but corrosion and equipment damage occur
Solution Approach 1:
The air flow pattern and pressure distribution are used as a copy or representation of the water flow conditions. By analyzing air pressure data, the system verifies nozzle condition without actually introducing water into the system, thereby eliminating corrosion while maintaining verification capability.
Solution Approach 2:
Air acts as an intermediary substance that allows the system to be tested without direct water contact. The air flow serves as a mediator to transmit pressure information through the deluge system components, enabling condition verification without the harmful effects of water exposure.
3Reliability
If wet testing is performed to test the water deluge system, then nozzle blockage can be detected, but personnel are exposed to water flow risks
Solution Approach 1:
The system creates a virtual copy of water flow conditions using air pressure measurements. By analyzing the air flow pattern and pressure data, nozzle blockage is detected without personnel needing to physically inspect water-dispensing nozzles, thus eliminating exposure risks while maintaining detection reliability.
Solution Approach 2:
The patent replaces the mechanical water dispensing and manual inspection process with an automated air pressure measurement and computer analysis system, eliminating the need for personnel to be exposed to water flow while maintaining the ability to detect nozzle blockages.
4Reliability
If wet testing is performed to test the water deluge system, then the system can be validated, but environmental impact increases
Solution Approach 1:
The system uses air as a substitute to create a virtual copy of the water flow test. By measuring air pressure and flow characteristics through the deluge system, validation is achieved without consuming water, thus eliminating the environmental impact associated with wet testing while maintaining system validation reliability.
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 method and apparatus enable efficient and accurate testing of the water deluge system without wet tests, reducing time, cost, and environmental impact, while ensuring effective fire suppression readiness and identifying hydraulic underperformance zones.
Implementation Method 1
providing a supply of pressurised air through the water deluge system using a blower coupled to the water deluge system
Implementation Method 2
sensor arrangement configured to measure the pressure of air at each of the plurality of outlets of the water deluge system
Data Source
AI summary
A method for testing a tunnel fire suppression system in the form of a water deluge system having a wet side and a dry side separated by a valve, includes the step of providing a nozzle arrangement comprising a plurality of nozzles, with each nozzle disposed in or coupled to an outlet of the water deluge system. The nozzle arrangement comprises, is coupled to or operatively associated with a sensor arrangement configured to measure the pressure of air at each of the plurality of outlets of the water deluge system and output one or more output signals indicative of the pressure of the air at the one or more outlets. The method includes providing a supply of pressurised air through the water deluge system using a blower coupled to the water deluge system. The method further includes measuring the pressure of the air at the one or more outlets of the water deluge system and outputting an output signal indicative of the pressure of the air at the one or more outlets, and conveying the output signal to a processing system configured to determine from said one or more output signals the flow rate of the air supply at the one or more outlets.