Surrogate Fluid Testing for Firefighting Foam Delivery Systems
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Solution Overview
Problem
Current methods for testing foam delivery systems on fire fighting vehicles often result in the release of Aqueous Film Forming Foam (AFFF) into the environment, which is not environmentally friendly, and there is a need for a system that can validate the readiness of these vehicles without causing environmental harm.
Innovation Solution
A testing system that uses an environmentally benign surrogate fluid, such as a dyed water mixture, to simulate the foam delivery process, allowing for the validation of fire fighting equipment while minimizing environmental impact, and includes a mobile platform with a surrogate fluid storage tank, flexible hoses, and a flow sensor to measure fluid flow rates, ensuring compliance with NFPA 412 standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AFFF is used for testing foam delivery systems, then the testing effectiveness is ensured, but environmental pollution is caused
Solution Approach 1:
The patent introduces a surrogate fluid as an intermediary substance that mimics the flow characteristics of AFFF without its harmful environmental properties. The surrogate fluid includes a carrier fluid with surfactant and optional foam concentrate, creating a foam-like substance that can be used for testing delivery systems without causing the same environmental pollution as AFFF
Solution Approach 2:
The patent modifies the chemical composition parameters by replacing AFFF with a surrogate fluid having different but functionally equivalent properties. The surrogate fluid uses alternative surfactants and foam concentrates that provide similar testing capabilities while eliminating the harmful environmental factors associated with AFFF
2Object-generated harmful factors
If surrogate fluid is used instead of AFFF, then environmental safety is improved, but testing accuracy may be compromised
Solution Approach 1:
The surrogate fluid is formulated with adjustable parameters including carrier fluid composition, surfactant concentration, and optional foam concentrate to match the flow characteristics and delivery system performance requirements. This allows the testing accuracy to be maintained while achieving environmental safety
Solution Approach 2:
The system incorporates flow sensors and monitoring capabilities to measure and verify that the surrogate fluid produces flow rates and delivery performance consistent with expected AFFF behavior. This feedback mechanism ensures testing accuracy is maintained despite using an alternative fluid
3Reliability
If foam delivery systems are tested with real foam, then operational readiness is validated, but resource consumption and waste increase
Solution Approach 1:
The surrogate fluid is designed as a disposable, inexpensive testing medium that can be used without concern for recovery or reuse. It provides the necessary operational readiness validation and is then discarded without causing environmental harm, eliminating the need for costly foam recovery and disposal processes
Solution Approach 2:
The surrogate fluid serves as an intermediary that enables operational readiness testing without consuming valuable real foam resources. It performs the same testing function and can be used in place of AFFF, reducing both resource consumption and waste generation
Data Source
AI summary
Methods of/for testing fire fighting vehicle foam delivery systems using an environmentally benign fluid. Systems and methods test the foam delivery systems' piping, valves, pump, proportioner, educator, and nozzles while minimizing the release of Aqueous Film Forming Foam to the environment. The testing system complies with the National Fire Protection Association.