Episode 01 - Clean Agent System (Johns).pptx

clean agent stystem

1. episode 1 CLEAN AGENT SYSTEM

2. What ····· where ····· why ····· how 2

3. First Lesson : What is a clean agent system? A clean agent is a gaseous fire suppressant that is electrically nonconducting and that does not leave a residue upon evaporation . This is ideal when protecting high value items like historical artifacts or sensitive electronic equipment. 3 Halocarbon Agent. An agent that contains as primary components one or more organic compounds containing one or more of the elements fluorine, chlorine, bromine, or iodine. Inert Gas Agent. An agent that contains as primary components one or more of the gases helium, neon, argon, or nitrogen. Inert gas agents that are blends of gases can also contain carbon dioxide as a secondary component. If only the space under the raised floor is to be protected by a total flooding system, an inert gas shall be used to protect that space. Total Flooding System. A system consisting of an agent supply and distribution network designed to achieve a total flooding condition in a hazard volume. Two broad product categories well-suited to a variety of applications and industry types. Preferred by fire safety professionals worldwide! FK-5-1-12 ( fluroroketone , NOVEC 1230) Clean, colorless, odorless and non-toxic clean agent for fire suppression; ideal for protecting water-averse installations formerly protected by Halon 1301 HFC-227ea ( h eptafluoropropane , FM 200) Best suited for use in occupied areas and to protect critical installations. Zero Ozone Depleting Potential (ODP) and can be safely employed where people are present.

4. Second lesson : Where we need a clean agent system? The common applications for clean agents are information technology rooms such as data centers, server rooms, telecommunications facilities, control rooms. Places where we have irreplaceable assets .  We consider clean agents from fire protection strategy perspective to be asset protection , so it protects the components or assets inside the room, and by default, by putting those fires out. 4 Data Centre Server/UPS Room Museums Telecom Centers Control Rooms

5. third lesson : Why we need a clean agent system? 5 Fast : Waterless agents/gases discharged into the risk area within 10 seconds to suppress fires immediately. E ffective : Electrically non-conductive/non-corrosive clean agents extinguish a fire in its incipient stage before it has a chance to spread. Zero Damage : No damage to electronics or delicate mechanical devices. Safe : Wide margin of human safety – safe to use where people are present. Clean : Rapidly vaporizes to gas during discharge and evaporates cleanly without leaving any residue behind. Result – no costly clean-ups. Earth Friendly : Non-ozone depleting and short atmospheric lifetimes.

6. fourth lesson : How to design and install a clean agent system? COMPONENTS: CYLINDER It consists of a siphon tube, cylinder valve, actuation port for electrical control head, discharge outlet port and pressure gauge. It is available as a Standard Unit or equipped with Switch-in-Gauge unit to monitor the health of cylinder pressure. MANIFOLD CHECK VALVE Manifold check valves are installed at the discharge manifold in a multiple cylinder arrangement. They prevent back flow from the manifold should the system be inadvertently discharged. DISCHARGE NOZZLE Nozzles provide the flow rate and distribution of agents in protected hazard areas. They have a NPT female pipe thread for attachment to the discharge piping, Available in 2 discharge patterns: 180 & 360 degrees, Brass MOC. PRESSURE OPERATED CONTROL HEAD (PNEUMATIC ACTUATOR) A pressure operated control head is attached to each slave cylinder at the valve actuation port. When the electric control head actuator opens the master cylinder valve, pressure from the master cylinder causes each pressure-operated control head to open its attached cylinder valve pneumatically. 6

7. fourth lesson : How to design and install a clean agent system? COMPONENTS: ELECTRIC-CUM-MANUAL ACTUATOR (ELECTRIC CONTROL HEAD) The Electric-Cum-Manual Actuator is an electromechanical device mounted on the master cylinder actuation port. On receiving a 24V DC signal from the fire alarm panel, it gets actuated and triggers the master cylinder actuation port. It also houses a manual release plunger which can be used to manually trigger the cylinder actuation port. A new feature in this actuator is the supervisory switch which is integrated into the electric control head to provide a signal to releasing control panel. This signal indicates that the electric control head is removed from master cylinder actuation port. MANIFOLD DISCHARGE PRESSURE SWITCH The Manifold Discharge Pressure Switch is mounted on manifold or piping network. It operates when exposed to pressure. A signal is relayed to the panel confirming the actuation of the switch. The switch may be installed in any position, although the upright position is preferable. The pressure switch incorporates a reset button which has to be depressed following a discharge. Switch rating: 6 Amp AUTOMATIC DETECTION Automatic detection shall be by any listed method or device capable of detecting and indicating heat, flame, smoke, combustible vapors, or an abnormal condition in the hazard, such as process trouble, that is likely to produce fire. Adequate and reliable primary and 24 hour minimum standby sources of energy shall be used to provide for operation of the detection, signaling, control, and actuation requirements of the system. 7

8. fourth lesson : How to design and install a clean agent system? LOCATION: Storage containers shall be permitted to be located within or outside the hazard or hazards they protect . Where container exposure to such conditions is unavoidable, suitable enclosures or protective measures shall be employed. Where storage containers are connected to a manifold, automatic means, such as a check valve, shall be provided to prevent agent loss and to ensure personnel safety if the system is operated when any containers are removed for maintenance. Manual controls shall not require a pull of more than 40 lb (178 N) nor a movement of more than 14 in. (356 mm) to secure operation. At least one manual control for activation shall be located not more than 4 ft (1.2 m) above the floor. AIR CONDITIOINING Other than the ventilation systems, forced-air ventilating systems, including self-contained air recirculation systems, shall be shut down or closed automatically where their continued operation would adversely affect the performance of the fire extinguishing system or result in propagation of the fire. If not shut down or closed automatically, the volume of the self-contained recirculating undampered ventilation system ducts and components mounted below the ceiling height of the protected space shall be considered as part of the total hazard volume when determining the quantity of agent. 8

9. fourth lesson : How to design and install a clean agent system? NOZZLE: Nozzles are available in 7-port or 8-port versions to provide 180 or 360 degree discharge patterns respectively. When considering the optimum nozzle location, the following factors should be taken into account. The maximum discharge radius is 8.7 m (28.6 ft) for a 360° nozzle and 10.05 m (33 ft) for a 180° nozzle . The maximum coverage area for either nozzle is 95.3 m² (1026 ft²) Nozzles must be installed a maximum of 300 mm (12”) below the ceiling 180 degree nozzles must be mounted adjacent to a wall and must be located to cover the entire area. Maximum distance 180 degree nozzles should be placed from a wall 300 mm (12”), the minimum 50 mm (2”). Measured from centre of the nozzle to the wall. Nozzles located both above and below the container outlet, Maximum distance between them 9.1 m (30 ft). 9

10. fourth lesson : How to design and install a clean agent system? PIPE HANGERS: Pipe hangers must be spaced according to the size of pipe (see table). Hangers must be placed within 300 mm (12”) of the discharge nozzle. Hangers must be placed between elbows that are more than 600 mm (24”) apart. Hangers must be fixed to a structure capable of supporting the Pipework. CALCULATION: The quantity of halocarbon agent required to achieve the design concentration shall be calculated from the following equation: W=V/S(C/(100-C)) where: W = quantity of clean agent [ lb (kg)] V = net volume of hazard [ft3 (m3)] C = agent design concentration (vol%) s = specific volume of the superheated agent vapor at 1 atm and the minimum anticipated temperature [°F (°C)] of the protected volume [ft3/ lb (m3/kg)] 10

11. fourth lesson : How to design and install a clean agent system? EXAMPLE: Room volume = 300 m3 Agent Specific Volume @ 1 atm. Pressure = 0.137 m3/kg (NFPA 2001 : Table A.5.5.1) Agent Design Concentration = 7 % per volume Tee Count of piping System = 6nos (NFPA 2001 : Table 5.5.3.1) Design Safety Factor = 0.02 (NFPA 2001 : Table 5.5.3.1) The agent quantity is calculated as W = (V/S) C/( 100-C) W = (300/0.137) 7/( 100-7) W = 2,189.78 x 0.0753 W = 165 kg Considering the safety factor of 0.02 for fittings, W = 168 kg 11

12. fifth lesson : How to test a clean agent system? At least annually, all systems shall be inspected and tested for proper operation. CONTAINER TEST At least semiannually, the agent quantity and pressure of refillable containers shall be checked. If a container shows a loss in agent quantity of more than 5 percent or a loss in pressure (adjusted for temperature) of more than 10 percent, it shall be refilled or replaced. HOSE TEST All system hose shall be examined annually for damage. If visual examination shows any deficiency, the hose shall be immediately replaced or tested. All hose shall be tested every 5 years. All hose shall be tested at 11⁄2 times the maximum container pressure at 130°F (54.4°C). PIPE TEST The pipe shall be pressurized to at least 40 psi (276 kPa). INTEGRITY TESTING The enclosure integrity test has been developed to locate the source of leaks and, from the data collected. In order to determine with any degree of confidence that the hazard area will hold the gas for the required time period, where necessary an Enclosure Integrity Test in accordance with NFPA 2001 appendix C or the authority having jurisdiction must be conducted. 12

13. fifth lesson : How to test a clean agent system? SYSTEM FUNCTIONAL OPERATIONAL TEST Operate detection initiating circuit(s). Verify that all alarm functions occur according to design specifications. Operate the necessary circuit to initiate a second alarm circuit, if present. Verify that all second alarm functions occur according to design specifications. Operate manual release. Verify that manual release function so occur according to design specifications. Operate abort switch circuit, if supplied. Verify that abort functions occur according to design specifications. Confirm that visual and audible supervisory signals are received at the control panel. Test all automatic valves, unless testing the valve will release agent or damage the valve (destructive testing). Check pneumatic equipment, where required, for integrity to ensure proper operation. 13

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15. THANK YOU! 15