Clean Agent Suppression Systems using HFC 42 bar
HFC 42 barHFCs are pure gases that leave no oily residues; they have minimal environmental impact and no depleting effect on the ozone layer. HFC227ea and l’HFC125 are over-pressurized with nitrogen to 42 bar. HFC23 saturates the area rapidly, thanks to its natural high vapor tension, with no need of additional propellant gases and no pressure drops during discharge. It is therefore possible to install the cylinders at a considerable distance from the protected area and so reap all the advantages of advanced systems technology.
The HFC gases are dielectric, clean, and safe for humans and delicate equipment and precious objects. HFCs extinguish fires partly by physical means, by subtracting thermal energy from the fire, and partly by chemical action, releasing into the space small quantities of substances that scavenge free radicals and inhibit the combustion chain reaction.
At design concentrations, HFCs are safe for protecting closed areas and flooding produces only a negligible decrease in the oxygen level. After discharge, the extinguishing agent can be dispersed by simple aeration.
HFC extinguishing systems guarantee not only a technically-advanced solution but also savings on space, thanks to the small overall dimensions of the compact system, and on the weight bearing on the structures. These savings continue through the life of the system, making periodic maintenance of the valves and the cylinders easier and less costly.
The integrity of any volume protected by a total flooding system must be checked to locate and seal any significant air leaks. Leaks can result in failure to maintain the concentration level of the extinguishing agent for the specified period of time. Verification of leaks must be conducted via the “Door Fan Test.”
- Low cylinder installation space requirement
- Suitable for protection of occupied areas
- Fast extinguishment thanks to rapid extinguishing agent discharge
- Low installation and maintenance costs
- Does not conduct electricity
- Leaves no residues after discharge
- No potential for ozone layer depletion
- Low global warming potential
- Electrical and electronic equipment
- Flammable liquids
- Areas normally occupied by personnel
The HFC extinguishing system is designed – using dedicated software for calculating the cross-section diameters of the nozzle passages – to discharge the extinguishing gas into the environment in 10 seconds. Discharge time is defined as the time needed to reach 95% of minimum design concentration.
Full discharge within 10 seconds is clearly advantageous with respect to technologies that provide discharge times – and consequently, extinguishment times – in excess of one minute. Use of the HFC extinguishing agents guarantee fast fire suppression and therefore less damage both to the protected spaces and objects and people present in the areas.
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System design can be conducted in accordance with various international standards, including:
- NFPA 2001 Standard on Clean Agents Fire Extinguishing Systems
- UNI EN 15004 Parts 1, 4, 5, and 6. Installazioni fisse antincendio. Sistemi ad estinguenti gassosi (Fixed Firefighting Systems. Gas Extinguishing Systems)
- VdS 2381 Feuerlöschanlagen mit halogenierten Kohlenwasserstoffen (Fire Extinguishing Systems Using Halocarbon Gases)
- CEA 4008 Fire Extinguishing Systems Using Non-liquefied Inert Gases. Planning and Installation
- APSAD R13 Règle d’installation – Extinction automatique à gaz (Installation Specifications – Automatic Gas Extinguishing Systems)
|Chemical name||Heptafluoropropane (HFC227ea)||Pentafluoroethane (HFC125)||Trifluoromethane (HFC23)|
|Over-pressurization with nitrogen||42 bar||42 bar||NO|
|Appearance (at 20° C)||liquefied gas||liquefied gas||liquefied gas|
|Odor||odorless||similar to ether||faint, similar to ether|
|Boiling point||-16.4 °C||-48.09 °C||-82 °C|
|Freezing point||-127 °C||-101 °C||-155.2 °C|
|Vapor pressure (at 20°C)||3.9 bar||12.05 bar||41.8 bar|
|Density in liquid state (at 20° C)||1410 kg/m3||1218 kg/m3||806.6 kg/m3|
|Density of saturated vapor||31.035 kg/m3||77.97 kg/m3||263.0 kg/m3|
|Specific volume of superheated vapor at 1.013 bar and 20°C||0.1374 m3/kg||0.1972 m3/kg||0.3409 m3/kg|
|Design concentration Class A and B UNI EN 15004 (% in volume)||7.9% ÷ 9.0%||11.2% ÷ 12.1%||16.3% ÷ 16.4%|
|LOAEL (Lowest Observed Adverse Effect Level)||10.5%||10.0%||>30%|
|NOAEL (No Observed Adverse Effect Level)||9.0%||7.5%||30%|
The EUROGARDIAN srl ISO9001-certified quality system guarantees full product traceability. The extinguishing systems meet the requirements of the European Pressure Equipment Directive (PED - 97/23/EC). The components meet the requirements of the PED, of the Construction Products Directive (CPD - 89/106/CE), and of the EN 12094-series standards.
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