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FACULTY OF SCIENCE AND TECHNOLOGYSBS5313FIRE SERVICESFIRE PROTECTION SYSTEMNON-WATER-BASED FIRE SUPPRESSION SYSTEMC.W.Fok
NON-WATER-BASED FIRE SUPPRESSION SYSTEMUsing water to extinguish a fire is not always the right choice, especially when the fuels are flammable liquids, electrical equipment and combustible metals. Furthermore, critical assets such as IT system, data storage rooms and manufacturing equipment, or irreplaceable items like customer/client records, intellectual property, art, artifacts will likely be damaged by water even if they were not destroyed by a fire. Hence, non-water-based fire suppression system is a solution.Non-water-based fire suppression systems basically include :1.Foam fire suppression system ( with a proportion of water )2.Gaseous ( Clean Agents ) fire suppression systems3. Dry powder fire suppression system
FOAM FIRE SUPPRESSION SYSTEMFire suppression foam is good for Class Bfire(US Classification)/B&C(UK Classification). Foam is made up of three ingredients : foam concentrate, water and air. When mixed correctly, these parts form a homogenous foam blanket that extinguishes flames by the combined mechanisms of cooling, separating the flame source from the product surface, suppressing vapours, and smothering. This makes foam suppression systems an effective option for protecting flammable and combustible liquids.
FOAM FIRE SUPPRESSION SYSTEMFoam monitorHigh expansion foam generator
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Foam equipment for storage facilityFire detection and extinguishing control panelFoam concentrate bladder tankFoam concentrate control valveProportionerDeluge valvewater
Simply stated, firefighthing foam is a stable mass of small, air-filled bubbles with a lower density than oil, gasoline, or water. Foam is made up of three ingredients….water, a foam concentrate, and air. Water is mixed with a foam concentrate (proportioned) to form a foam solution. This solution is then mixedwith air (aspirated) to produce a foam which readily flows over fuel surfaces. Balanced pressure proportioning is the most common method used for foam system applications. The foam concentrate pressure is balanced with the water pressure at the proportioner inlets allowing the proper amount of foam concentrateto be metered into the water stream. With an aspirating discharge device, foam solution passes through an orifice, past air inlets, and into an expansion area to produce an expanded foam. Withnon-aspirating devices, foam solution passes through the orifice and dischargeoutlet where it mixes with air enroute to the fire.
SYSTEM COMPONENTSFire fighting foam systems suppress fire by separating the fuel from the air (oxygen). Although many types of systems are available; a basic foam system will always require foam agent storage, proportioning equipment, one or more discharge devices, and a manual and/or automatic means of detecting the fire and actuating the system.