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Inergen fire suppression systems
What is INERGEN? 

INERGEN is a mixture of nitrogen, argon and carbon dioxide, and has been specially developed to provide fire protection for sensitive electrical and electronic instruments and equipment. 

How does INERGEN work? 

INERGEN extinguishes fire by reducing the oxygen level in a room to below 15% (the point at which most combustibles will no longer burn). Simultaneously the patented carbon dioxide in INERGEN protects anyone that may be trapped in the fire area from the effects of the lowered oxygen levels. 

Gas suppression systems are extensively used in electronic data protection and electrical system switch environments. Systems comprise electrical detection linked to a bank of cylinders where the gas is stored ready for discharge into the fire area.
Inergen Clean Agent Fire Suppression Systems are completely environmentally friendly and safe to use in enclosed areas where people may be present. Inergen is zero ozone depleting, zero global warming, and has a zero atmospheric lifetime. 

Inergen is composed entirely of naturally occurring gases already found in the air we breath: nitrogen, argon, and carbon dioxide. Inergen does not produce a heavy fog upon discharge so escape routes remain completely visible.

The fire suppression is performed by lowering the oxygen content of the protected area to a point sufficient to sustain human life but insufficient to support combustion. Typical applications for Inergen are computer centers, tape storage centers, telephone exchanges, remote cellular sites, process control rooms, medical diagnostic rooms and MRI scanners, plus many others.

Getz Fire Equipment offers 24-hour service as well as the NFPA 2001 required semi-annual inspections to your Inergen Fire Suppression System.

Inergen is an environmentally green three dimensional fire suppression agent replacing Halon 1301. Critical facilities such as data processing rooms, telecommunications switching facilities, process control rooms, and others, require a non-water based extinguishing agent that:

Is electrically nonconductive 

Is safe for use in human occupied facilities 
Would not damage sensitive electronic equipment 
Has zero ozone depletion, zero global warming, and zero atmospheric lifetime 
Inergen is a blend of three naturally occurring gases--Nitrogen, Argon, and Carbon Dioxide. It is stored in cylinders near the facility under protection.

The strategy of fire extinguishment employed by an Inergen system is like no other modern suppression system in use today. An Inergen system lowers the oxygen content of the protected area to a point sufficient to sustain human life, but insufficient to support combustion. It's that simple.

Because it's not a chemical agent, Inergen will not produce a heavy fog the way other extinguishing agents do, so escape routes remain visible.

The Inergen discharges through specially designed nozzles. To minimize turbulence in the protected area Inergen nozzles are fitted with discharge deflectors.

At Gielle Srl our design specialists are factory trained in the design of Inergen systems. Engineered drawings will be prepared using the latest versions of AutoCad. You will be supplied hydraulic flow calculations and other engineering data detailing the expected performance of your Inergen system.

No Inergen system is complete without after-sale service. Our Engineered Systems Service Department will stand ready to offer 24 hour emergency and routine service to keep your Inergen fire protection system ready and able at all times.

Inergen fire suppression system: system specifications

INERGEN agent is a mixture of threenaturally occurring gases: nitrogen, argon,and carbon dioxide. As INERGEN agent isderived from gases present in the earth’satmosphere, it exhibits no ozone depletingpotential, does not contribute to globalwarming, nor does it contribute uniquechemical species with extended atmosphericlifetimes. Because INERGEN agent iscomposed of atmospheric gases, it does notpose the problems of toxicity associated withthe chemically derived Halon alternativeagents.


The INERGEN Fire Suppression System,manufactured by Ansul, is an engineeredsystem utilizing a fixed nozzle agent distributionnetwork. The system is designed andinstalled in accordance with the National FireProtection Association (NFPA) Standard2001, ‘‘Clean Agent Fire ExtinguishingSystems.’’ When properly designed, theINERGEN system will extinguish surfaceburning fire in Class A, B, and C hazards bylowering the oxygen content below the levelthat supports combustion.INERGEN agent has also been tested byFMRC for inerting capabilities. Those testshave shown that INERGEN agent, at designconcentrations between 40% and 50%, hassuccessfully inerted mixtures of propane/air,and methane/air.The system can be actuated by detectionand control equipment for automatic systemoperation along with providing local andremote manual operation as needed.Accessories are used to provide alarms,ventilation control, door closures, or otherauxiliary shutdown or functions.When INERGEN agent is discharged into aroom, it introduces the proper mixture ofgases that will allow a person to breathe in areduced oxygen atmosphere.A system installation and maintenancemanual is available containing information onsystem components and proceduresconcerning design, operation, inspection,maintenance, and recharge.The system is installed and serviced byauthorized distributors that are trained by themanufacturer.

Basic Use – The INERGEN system is particularlyuseful for suppressing fires in hazardswhere an electrically non-conductive mediumis essential or desirable; where clean-up ofother agents present a problem; or where thehazard is normally occupied and requires anon-toxic agent. 

Composition and Materials 

The basicsystem consists of extinguishing agent storedin high strength alloy steel cylinders. Varioustypes of actuators, either manual or automatic,are available for release of the agentinto the hazard area. The agent is distributedand discharged into the hazard area througha network of piping and nozzles. Each nozzleis drilled with a fixed orifice designed todeliver a uniform discharge to the protectedarea. On large hazards, where three or morecylinders are required, a screwed or weldedpipe manifold assembly is employed. Thecylinder(s) is connected to the distributionpiping or the manifold by means of a flexibledischarge bend and check valve assembly.

Additional equipment includes

Controlpanels, releasing devices, remote manualpull stations, corner pulleys, door closures,pressure trips, bells and alarms, and pneumaticswitches. All or some are requiredwhen designing a total system.INERGEN Agent – INERGEN agent is amixture of three inerting (oxygen diluting)gases: 52% nitrogen, 40% argon, and 8%carbon dioxide. INERGEN gas extinguishesfire by lowering the oxygen content below thelevel that supports combustion. WhenINERGEN agent is discharged into a room, itintroduces the proper mixture of gases thatstill allow a person to breathe in a reducedoxygen atmosphere. It actually enhances thebody’s ability to assimilate oxygen. Thenormal atmosphere in a room contains 21%oxygen and less than 1% carbon dioxide. Ifthe oxygen content is reduced below 15%,most ordinary combustibles will cease toburn. INERGEN agent will reduce the oxygencontent to approximately 12.5% whileincreasing the carbon dioxide content toabout 4%. The increase in the carbon dioxidecontent increases a person’s respiration rateand the body’s ability to absorb oxygen.Simply stated, the human body is stimulatedby the carbon dioxide to breathe more deeplyand rapidly to compensate for the loweroxygen content of the atmosphere.


The cylinders are constructed,tested, and marked in accordance withapplicable Dept. of Transportation (DOT)and the U.S. Bureau of Explosives specifications.As a minimum, the cylinders mustmeet the requirements of DOT 3AA2300or 3AA2015+.Cylinder Assembly – The cylinder assemblyis of steel construction with a red standardfinish. Four sizes are available to meetspecific needs. Each is equipped with apressure seat-type valve equipped withgauge. The valve is constructed of forgedbrass and is attached to the cylinderproviding a leak tight seal. The valve alsoincludes a safety pressure relief devicewhich provides relief at 2900-3300 psi(20685-23167 kPA) per CGA test method.Cylinder charging pressure is 2175 psi at70 °F (14997 kPA at 21 °C). The cylindersare shipped with a maintenance record cardand shipping cap attached. The cap isattached to the threaded collar on the neckof each cylinder to protect the valve while intransit. The cylinder serial number and dateof manufacture are stamped near the neck ofeach cylinder.

Electric Actuator

Electric actuation of anagent cylinder is accomplished by anelectric actuator interfaced through anAUTOPULSE® Control System. This actuatorcan be used in hazardous environmentswhere the ambient temperature range isbetween 32 °F and 130 °F (0 °C and 54 °C).In auxiliary or override applications, a manuallever actuator can be installed on top of theactuator.Manual or Pneumatic Actuators – Twotypes of manual/pneumatic actuators areavailable for lever actuation on the cylindervalve. Manual actuation is accomplished bypulling the hand lever on the actuator. Thelever design contains a forged mechanicaldetent which secures the lever in the openposition when actuated.

Detection System 

The AUTOPULSEControl System is used where an automaticelectronic control system is required toactuate the INERGEN system. This controlsystem is used to control a single fixed firesuppression or alarm system based oninputs received from fire detection devices.The detection circuits can be configuredusing cross, counting, independent or priority-zone (counting) concepts. The controlsystem has been tested to the applicableFCC Rules and Regulations for Class AComputing devices.

Typical Inergen Installations

A few typical installations often protected by Inergen include:

Computer Room Fire Protection Systems 
Data Center Fire Protection Systems 
Telecommunications Fire Protection Systems 
Telephone Switch Fire Protection Systems 
Raised Floor Fire Protection Systems 
Tape Storage Fire Protection Systems 
Switch gear Fire Protection Systems 
Vault Fire Protection Systems 
Process Equipment Fire Protection Systems 
Any normally occupied or unoccupied areas with sensitive electronic equipment 
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