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. SECTION If—SYSTEM DESCRlPTION � UL EX.5174 10-31-97 Page 2-1 TOTAL SYSTEM The PIRANHArM Restaurant Fire Suppression System is a NOTICE patented, pre-engineered, fixed, automatic fire suppression sys- The PIRANHA system includes an atmospheric tem developed specificaliy for improved fire protection of commer- anti-siphon vacuum breakeras an infegral com- cial and institutional restaurant cooking appiiances, exhaust ponent, built into the AUTOMAN Release. The hoods, and ducts.When actuated, the system discharges a fixed atmospheric anti-siphon vacuum breaker is amount of proprietary wet chemical agent followed by water used to eliminafe the possibility of creating a through the same nozzles.Water is provided by a connection to vacuum, thus eliminating back siphonage of the building water supply. NOTE. Connection to a fire sprinkler agent into the potable water supply.The atmos- system is not allowed. pheric anti-siphon vacuum breaker meefs the The three sizes of systems are: requirements of ASSE(American Sociefy of PIRANHA-7 (7 nozzle capacity) Sanitation Engineers) Standard 1001, ANSI PIRANHA-10: (10 nozzle capacity) (American National Standards lnstitute) PIRANHA-13: (13 nozzle capacity) Standard A1 i2.1 > and CSA (Canadian Standards Associafion)Standard 864 Based The system is designed to provide either full hood continuous on backflow prevention testing by an indepen- overlapping protection for a typical cooking appliance lineup or dent laboratory, the PIRANHA system has been group protection for one or more appliances under a longer hood. specifically listed and approved by IAPMO The system can be pre-piped prior to the appliances being put in (International Association of Plumbing and place. At any time, appliances protected by overlapping nozzle Mechanical Officials) in accordance with 1GC coverage can be interchanged freely without changing or relocat- 1 i3-97, and each PIRANHA system bears the ing noules. :APP✓10/U.°C logo indicating approva;under the The type of system required for the particular installation wili be Uniform Plumbing Code. determined through the guidelines covered in "System Design:' Undenvriters'Laboratories (UL) has tesfed the Additional equipment which may be required to complete the sys- PIRANHA system for mechanical and fire sup- tem design is explained in the "System Components" section. pression performance in accordance with UL Additional devices covered are� remote manual pull stations, Standard 300.UL has not evaluated the integral mechanical and electricai gas shut-off valves, electrical switches, anti-siphon vacuum breaker or any ofher back- and pressure switches. flow prevention device with respecf to their ability to prevent backflow from occurring. AESCRIPTION OF SYSTEM The tank assembly is filled with a proprietary wet agent under SYSTEM OPERATION atmospheric pressure.The system is equipped with a pneumati- When a fire is detected by the fire suppression system,the spring- cally controlled water flow valve.The water iniet port of the valve loaded AUTOMAN Release assembly automatically actuates to assembly is piped to a potable water source.The valve is ciosed puncture the seal of the expellant gas cartridge, thereby releasing and under static water pressure.The high pressure gas inlet port gas under high pressure to both the high pressure iniet of the of the valve is piped to the high pressure side of the AUTOMAN water flow valve and the high pressure inlet of the pressure regu- release mechanism and is under atmospheric pressure until the lator, where the high gas pressure is reduced to a lower operating fire suppression system is actuated. This high pressure line pressure for the agent tank.The high pressure gas opens the valve includes a check valve to trap high pressure gas in the line when to the water supply by moving the internal stem assembly toward the system is actuated.The low pressure gas inlet.port on the pick- the water inlet against the force of the spring and the static water up tube assembly is piped to the low pressure side of the gas pressure. Once the stem assembly is unseated, the trapped high pressure regulator and is also under atmospheric pressure until pressure gas will hold it open until the gas pressure is manually the system is actuated. The gas pressure regulator receives its released after the fire event when the system is recharged and pressure from a gas cartridge installed in the release mechanism. reset.The low pressure gas from the regulator enters the top of the The tank discharge outlet on the pick-up tube assembly is tank to expel the wet agent from the tank through the tank dis- connected to the discharge piping of the agent/water distribution charge outlet, discharge piping, and discharge nozzles.Once the system low pressure gas is flowing,the regulator will feed the low pressure gas into the tank at a constant pressure until the decaying pres- sure of the gas in the cartridge falls below the Preset outlet pres- sure of the regulator, at which time the gas pressure from the reg- ulator wiil also decay. Although the valve was opened initially by the high gas pressure, water will not flow into the tank until the water pressure from the water supply overcomes the decaying gas pressure of the low pressure gas in the top of the tank, at which time water will auto- matically commence flowing through the tank, discharge piping, and the discharge nozzles. Water will continue to flow until it is manualiy shutoff upstream from the water flow valve after the fire event is concluded.