ICAF System with pneumatic release - Fireflex.com

ICAF - Integrated Compressed Air Foam SystemSystem Trim SectionPage 1 of 4ICAF System with Pneumatic Release1. DescriptionThe ICAF System utilizes a Flow Control valve (B14) tocontrol water flow into system piping equipped with openrotating spray nozzles. The system piping remains emptyuntil the pneumatic control line is activated by the operationof the pneumatic release system.Pneumatically controlled ICAF systems require a pneumaticrelease system, equipped with fixed temperature releasesand/or pilot heads. Release trim, for pneumatically controlledICAF systems utilize a Pneumatic Actuator (R5) normallyheld closed by pressure maintained in the pneumatic releasesystem.ICAF systems are designed so the system will open when adetector on the pneumatic release system operates. Whenthe pneumatic actuator (R5) opens, the pneumatic controlline is pressurized causing the water, air and foampneumatically operated control valves (A1, B9 & F1) to opensimultaneously and generate the CAF into the dischargedevices and to be discharged over the area served by thedischarge devices.Note:The air supply for the pneumatic release piping system isprovided by the cylinder bank installed as part of the ICAFSystem unit. It is recommended to provide Inspectors TestConnections on the release system.Under normal conditions, system water supply pressureenters the priming chamber of the Flow Control Valve (B14)through the priming line which includes a normally openpriming valve (B1), strainer (B2), restricted orifice (B3) andspring loaded check valve (B4).1. System air supply pressurizes the normally closed airpneumatically operated control valve (A1), and the normallyclosed foam pneumatically operated control valve (F1).2. Water supply pressure is trapped in the primingchamber by a spring loaded check valve (B4) and thenormally closed water pneumatically actuated control valveValve (B9). The pressure in the priming chamber holds theFlow Control Valve (B14) clapper closed, keeping the outletchamber and system piping dry.3. System air supply pressurizes the normally closed airpneumatically actuated control valve (A1), the normallyclosed foam pneumatically actuated control valve (F1) andthe normally closed Solenoid Valve (R4) prevents the air tofill up the control lines, keeping the system closed.REFER TO NEXT PAGE TO VIEW TRIM SCHEMATIC.2. Normal conditionMain Water Supply Control Valve (D1) should be CLOSED.Priming valve (B1) must be CLOSED. Air supply must beCLOSED (see AIR SUPPLY SECTION). Flow TestValve (B6) and main drain valve (D3) must be CLOSED.Alarm test valve (B5) must be CLOSED. Verify that theEmergency Release valve (B10) is CLOSED. Systemflushing valve (A3) and foam injector flushing valve (F5) mustboth be CLOSED. All gauges (B11, B12 and E3) shouldshow 0 psi pressure.Foam concentrate tank (T1) must be filled according to theprocedure described in the FOAM SUPPLY section.Table 1: Pressure SettingsDEVICERelease System AirPressure Gauge (E3)Pneumatic ActuatorPressure Gauge (F4)Low Air SupervisoryPressure Switch (E4)WATER SUPPLY PRESSURESUp to 175 psi 175 psi (1 207 kPa)(1 207 kPa) to 250 psi (1724 kPa)35 PSI (241 kPa) 55 PSI (380 kPa)35 PSI (241 kPa) 55 PSI (380 kPa)25 PSI (173 kPa) 45 PSI (311 kPa)FM-0723-0-11 A