Experts in fire protection

What distinguishes an inert gas extinguishing system?

The inert gases used in Oxeo extinguishing systems are distributed homogeneously in the event of fire and displace the oxygen from the fire source. Thanks to the three-dimensional mode of action, even concealed fire sources are reliably and safely extinguished before re-ignition. For this reason Oxeo extinguishing systems are very suitable even for the fire protection of special risk areas with flammable liquids and other hazardous substances and of areas with high fire loading.

Rapid fire extinguishing with inert gases keeps dam- age caused by fire to a minimum. In addition to this – in contrast to water, foam or power – secondarydamage caused by the extinguishing agent is excluded:inert gases leave no extinguishing agent residues and can be simply removed from the affected area again by ventilation after extinguishing the fire.

Oxeo extinguishing systems are therefore always an out- standing solution if it is worth protecting valuable goods or irreplaceable cultural objects from being destroyed by fire. Moreover inert gases are electrically non-conductive, so that they can also be used in areas with electrical or electronic components. So Oxeo extinguishing systems avoid long downtimes and expensive interruptions in operations.

Advantages at a glance

Oxeo inert gas extinguishing systems utilize inert gases, such as argon or nitrogen, and the resulting reduction of the oxygen content. They are suitable for protecting areas with high-quality yet sensitive equipment, where residue-free extinguishing - without the use of water, foam or powder extinguishing agent - is to be preferred. Argon and nitrogen are natural components of ambient air and also non-toxic and non-electrically conductive.

  • Excellent extinguishing effect even in special hazard zones and in areas with high or concealed fire hazards
  • The inert gases used are non-conductive and leave no residues - this makes them ideal for the protection of highly-valuable and sensitive equipment
  • In the concentrations required for extinguishing inert gases used are non-toxic and therefore suitable for use in areas that are accessed by people
  • Nitrogen and argon are natural components of ambient air - no harmful impact on the atmosphere
  • Nitrogen and argon are available almost everywhere - this means, quick and cost effective reactivation after operation
  • Cost-effective multi-zone systems with extinguishing gas storage can be implemented for several extinguishing zones
  • High degree of flexibility for modification or extension measures, thanks to the Oxeo storage system
  • Oxeo technology enables a more compact storage of the extinguishing agent, requiring up to 50% less space
  • ConstantFlow technology ensures a constant flow of the extinguishing agent in the event of a fire - this permits the use of pressure relief flaps that are up to 70% smaller
  • The MX DesignManager calculates the perfect system option and solution for every project

Do you have questions regarding the product or would you like individual advice? Please feel free to contact us!

Construction of an Inert gas system

Oxeo extinguishing systems are subdivided into fire detection and extinguishing control technology, the extinguishant supply and into one or more extinguishing areas with corresponding area subdivision.

1
Oxeo RD nozzle
2
Disable device
3
Oxeo storage system
4
Fire detection and extinguishing control panel
5
Oxeo SPA nozzle
6
Pressure relief flap
7
Pneumatic time delay device
8
Pressure reducer
9
Fire detector
10
Quantity control valve
11
Safety valve
12
Pilot cylinder
Construction of Oxeo Inert gas systems
  1. Oxeo RD nozzle
    1 Oxeo RD nozzle

    The Type VN nozzle is available in various sizes and offers an innovative solution: thanks to a patented technology, it can be adapted to the required extinguishing agent throughput in the installed state. Changes in space require only an exchange of the diaphragm, but not the entire nozzle.

  2. Disable device
  3. Oxeo storage system
    3 Oxeo storage system

    Space saving

    As a result, Oxeo extinguishing systems require up to 50% less space for the extinguishing gas supply than inert gas systems with 80 l / 200 bar gas cylinders and a conventional supply system.

  4. Fire detection and extinguishing control panel
  5. Oxeo SPA nozzle
    5 Oxeo SPA nozzle

    "Soft flooding"

    Thanks to the special SPA type nozzles, with sound absorbers, in combination with the ConstantFlow technology, it is possible to achieve “soft flooding” of the rooms in the event of a fire: During the emission of the inert gas, the sound pressure level is significantly reduced and the flooding process with the Oxeo extinguishing system is generally far gentler. In this way the protected equipment is protected against strong vibrations and particularly sensitive facilities, such as rotating hard drives in server rooms and data centers, are less subject to harmful impacts.

  6. Pressure relief flap
    6 Pressure relief flap

    Pressure relief

    Flooding a room with gas always creates over pressurization of the room. This may cause damage to doors, ceilings and walls, unless suitable counter-measures are taken. To negate this effect, a pressure relief flap corresponding to the expected flow of extinguishing agent is usually installed in the protected room when the gas extinguishing system is installed. This flap opens when a pre-determined room pressure is reached, allowing the air displaced by the gas to escape directly to the exterior.

  7. Pneumatic time delay device
  8. Pressure reducer
  9. Fire detector
  10. Quantity control valve
  11. Safety valve
  12. Pilot cylinder

How does an inert gas extinguishing system work?

Oxeo ConstantFlow technology operates with high-performance pressure regulators mounted di- rectly on the extinguishing agent cylinder valves. At the start of the extinguishing procedure the operat- ing pressure is thus already reduced to a maximum of 60 bar at the output of the extinguishing agent cylinders. In addition, a constant stream of extin- guishing agent is created without a pressure spike. In conventional inert gas extinguishing systems on the other hand the gas escapes from the cylin- ders into the pipe network at the beginning of the extinguishing process with a charging pressure of up to 300 bar.

This creates a pressure spike at the beginning of an extinguishing process as well as a heavy stream of extinguishing agent which rapidly decreases with the duration of the flooding. A crucial advantage: In Oxeo extinguishing systems with ConstantFlow, thanks to the constant stream of extinguishing agent, pressure relief flaps can turn out to be 70 % smaller than in conventional inert gase xtinguishing systems.

The extinguishing areas can be planned more flexibly. Smaller pressure relief flaps can be more easily in- tegrated into exteriors and the area excess pressurefrom basements can be conducted via small channelsinto the open air without any problem. Together with the special nozzles with SPA silencers the constant stream of extinguishing agent without a pressure spike allows a "soft flood" in the event of fire.

The gentler flooding process reduces vibrations on the protected equipment and in particular is gen- tle on particularly sensitive equipment such as rotat- ing hard drives in server rooms and data centers. When using Oxeo ConstantFlow technology the con- nected conduits and selector valves need only to be designed for the low pressure level of 60 bar max- imum, which may result in significantly profitable solutions being implemented in many cases.

Fire detection and extinguishing control

Fire detection and extinguishing control technology using the Oxeo extinguishing system

Oxeo extinguishing systems are controlled and monitored through the tried and tested Minimax fire detection and extinguishing control technology. This ensures perfect compatibility, backed up by general approvals of electrical and mechanical system components. Unnecessary coordination costs and efforts or interface problems between different parts of the system are thus avoided. The extinguishing zones are continuously monitored by smoke, heat and/or flame detectors. In the event of a fire, these detectors transmit a signal to the FMZ 5000 fire detection and extinguishing control panel. The panel then activates the Oxeo extinguishing system and, in the case of multi-zone systems, the relevant selector valve. At the same time, it triggers an acoustic and optical alarm, which urges anyone present in the zone to leave the room affected, and simultaneously sends a signal to a permanently manned station. Once the individually defined pre-warning time expires, the actual extinguishing process starts. This means that the extinguishing gas is delivered to the extinguishing zone by means of the pipe network and emitted from the extinguishing nozzles thus extruding the oxygen from the source of the fire.

Extinguishing gas storage

Extinguishing agent storage

The extinguishing agent is stored in high-pressure gas cylinders, which are then used in combination, enabling both the optimization of available space and extendibility of the Oxeo storage system. The filling pressure of every single cylinder is constantly monitored for leakage with pressure gauges and the results are displayed. Any error messages are transmitted to the fire detection and extinguishing control panel. This means that the quantity of available gas is constantly controlled. The quantity of extinguishing gas to be stocked depends on the fire hazard and the size and nature of the protected facility. The modular structure of the Oxeo storage system allows for perfect adaptation to the customer’s individual needs and local conditions and offers maximum flexibility, especially for system modification or extension.

Extinguishing zones and zone subvisions

Extinguishing areas and area partitioning

A pipe network with Oxeo extinguishing nozzles runs through the protected area. The size of the pipe network and the overall arrangement of the extinguishing nozzles are determined by the respective risk. Oxeo fire extinguishing systems can be used as a single-zone system for the protection of one extinguishing area or as a multi-zone system for the protection of two or more extinguishing areas. Multi-zone systems are equipped with section valves which, in the event of a fire, only disperse the extinguishing agent in the affected extinguishing area. Individually controllable containers release a precise quantity of extinguishing agent tailored to the extinguishing area. As a result, separate fire extinguishing systems are not required. Extinguishing agent storage doesn’t exceed the amount required for the largest extinguishing zone in the system. In addition, the system can be easily adapted to building conversions. The quantity of fire extinguishing agent to be discharged and the flooding time determine the arrangement of the extinguishing nozzles and the complexity of the pipe network. Special design extinguishing nozzles make it easy to layout the pipe network.

Applications

As inert gases are electrically non-conductive and leave no extinguishant residues behind in the event of fire, Oxeo extinguishing systems are an outstanding solution to protect valuable goods and irreplaceable cultural objects or prevent electrical or electronic equipment from being out of operation for a long time.

Oxeo extinguishing systems are also best suited for the protection of special risk areas with flammable liquids and other hazardous substances, such as paint facilities, and of areas with concealed fire sources such as automated storage and retrieval systems. With argon even metal fires can be extin- guished

Electric & control rooms
Electric & control rooms

Protection zone

Control rooms are very sensitive and high-quality facilities which control fundamental production processes. They contain electric switching and control equipment plus false floors with extensive cabling. Even minor defects may cause substantial operational failures.

Risks

  • Short circuits
  • Highly flammable materials

Fire Protection

Oxeo inert gas extinguishing systems offer reliable protection in control rooms. For smaller control rooms, MX 1230 extinguishing systems offer an economical alternative. The extinguishing system is triggered by a fire detection system using punctiform smoke detectors or HELIOS AMX5000 aspirating smoke detectors.

Filter systems
Filter systems

Protection zone

Filter systems are used whenever the production process generates fumes, or when dusts are released through abrasion. Fine dusts occur for example, when milling or cutting plastics or when processing other materials.

Risks

  • Explosive atmosphere
  • Highly flammable dust in the filter bags

Fire Protection

Carbon dioxide extinguishing systems are ideal for protecting filter housings against fires. In the case of metal extraction, however, the Oxeo extinguishing system using the argon extinguishing agent is the right choice to preclude interactions of the extinguishing agent with combustible metal. A fire detection system will trigger the extinguishing system.

Server rooms
Server rooms

Protection zone

Server rooms are important, sensitive areas. In these rooms, data of high importance for business operations is stored, managed and exchanged over the network. The irretrievable loss of this data through a fire may have considerable economic consequences for productivity or even the future of a company.

Risks

  • Overheating of technical equipment
  • Defects such as short circuits
  • Considerable damage even in the case of small fires

Fire Protection

For small and medium-sized server rooms, the MX 1230 extinguishing system is the ideal solution. It gives residue-free extinguishing using the innovative Novec™ 1230 extinguishing agents and requires very little space. Oxeo inert gas extinguishing systems are ideal for large server rooms. The MX 1230 extinguishing system and Oxeo inert gas extinguishing systems are triggered, and fires are detected, by a fire detection system using a HELIOS AMX5000 smoke aspirating system.

Utility rooms
Utility rooms

Protection zone

HVACR rooms are an absolute key area for the proper operation of a building. In addition to switching and control systems for the elevator system, they house safety-relevant HVACR systems, such as overpressure control, that keep the escape routes smoke-free in the event of fire. The facilities are particularly sensitive and must function without interruption - only then can the operation be maintained without problems on all floors of the building.

Risks

  • Overheated ventilators, compressors and cooling units
  • Short circuits on electronic components

Fire Protection

In case of particularly high availability requirements, e.g. for the switching and control system of the elevator system, residue-free extinguishing with Oxeo extinguishing systems or MX 1230 fire extinguishing systems makes sense. A fire detection system using the HELIOS AMX5000 smoke aspirating system triggers the extinguishing system.

Alternatively HVACR rooms can be integrated into the overall building protection through sprinkler systems. If necessary, the use of Preaction sprinklers makes an unintentional triggering of extinguishing system virtually impossible. 

Approval

All system variants and options of Oxeo extinguishing systems are tested and approved by VdS loss prevention. Our systems also comply with the UL and many other international certification bodies.

VdS - Confidence through Safety

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