陕西省秦岭终南山公路隧道

Qinling Zhong Nan Shan Road Tunnel

The worldwide longest continuous road tunnel is located in Xi’an Province, North China, totally 18.02 km, which is designed as 2 tubes in single traffic direction . Siemens BT China offered Fire Detection solution including AlgoRex Fire Detection, MM8000 Danger Management and FibroLaser II Linear Heat Detection products, especially total 6 units OTS-4 Fibrolaser controllers are installed inside the tunnel. The total contract value is amount RMB 3.7 million

LIOS Technology equipped, in collaboration with Siemens BT, the entire airport facilities with highly reliable Linear Heat Detection (LHD) Systems to protect the Metro station with its tunnels for the high speed train ICE (Inter City Express), all intermediate ceilings, parking decks, bus stations and the waiting halls of the airport.
All LHD controllers are mounted in adapted cabinets and ready to provide in case of an critical situation like a fire, the alarm signal including the exact alarm location via the SCADA system directly to the control room, where the fire department is notified immediately.

Initially, the project started on June 12, 2004, when German Federal Chancellor Gerhard Schroeder personally opens the new ICE airport station Cologne/Bonn. The railway station itself as well as the adjacent train tunnels of the airport loop were first to be equipped with the intelligent fire detection system. Later other airport facilities followed.

The maintenance-free fibre optic sensor cable is flexible in use and installed also for the covered streets as shown in the following pictures.

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Take a tour at the Siemens booth at Security 2010 in Essen.
For your safety and security.

Read more:

• FibroLaser – optimum safety with linear heat detection

LIOS Technology and its Croatian partner Tehnomobil have set a new standard for modern fire safety solutions for the road tunnel network in Croatia.

Croatia is located in South-Central Europe and shows diverse terrain, including: rolling hills in the continental north and northeast, densely wooded mountains and rocky coastlines on the Adriatic Sea. The highlight of Croatia’s recent infrastructure developments is its rapidly growing highway network which puts focus on tunnels as well.

Tehnomobil’s excellent engineering and contracting background in traffic infrastructure and fire fighting industries perfectly match with LIOS Technology’s comprehensive experience in fire detection applications for tunnels and special hazard buildings with an impressive track record of more than 2000 installed fibre optic temperature sensing systems worldwide.

Best fire surveillance for more than 90 % of the road tunnels in Croatia

At present an impressive share of more than 90 % of the Croatian road tunnels are equipped with the fibre optic fire detection system by LIOS Technology. In 28 tunnels with in total 55 tunnel tubes the purely passive LIOS fibre optic line sensor cable has been installed by Tehnomobil for reliable and fast fire detection. Those tunnels with tube lengths ranging from 500m to almost 6000m were newly opened in recent years or re-opened after full refurbishments where the conventional line type fire detection system could be replaced by the fibre optic LIOS system. Within LIOS Technology’s long list of tunnel projects in Croatia it is worth to stress the tunnels Veliki Glozac and Brinje which received best scores at recent European tunnel safety rankings.

EuroTAP: Brinje Tunnel on Dalmatina highway tops Europe’s safety ranking

The European Tunnel Assessment programme (EuroTAP) place a Croatian tunnel, the “Brinje” at the top of the list, as the best tunnel in Europe in 2007.  EuroTAP 2007 inspected 51 major road tunnels important for transeuropean road traffic located in 13 countries across Europe and concluded that none could beat this Croatian tunnel despite the fact the since 2004 tunnels in the European Union must comply with a Directive prescribing minimum safety standards for road tunnels . The Brinje, a 1570m tunnel opened in 2004, located on the A1 between the cities of Zagreb and Split displayed top scores for the fire protection and winning features in all safety categories: low risk traffic flows using two tubes, 24 hour monitoring from a tunnel control centre manned by trained staff; immediate notification of traffic disruptions, use of lay-bys or emergency facilities; additional escape and rescue routes well marked by evacuation lighting and good indications of the escape direction and the distance to the nearest exit.

State of the art fire safety

A proper fire protection concept is not simple when the protection area is affected by harsh environmental conditions. Conventional sensor technologies often fail and tend to produce false alarms. Great efforts are needed to keep the conventional fire detection system properly maintained. LIOS Technology’s unique Linear Heat Detection Systems are designed to reduce the operational costs and offer maximum reliability even under severe tunnel conditions with dirt, dust and corrosive atmospheres as well as high humidity and dynamic temperature fluctuations.

Safety systems demand reliable and quick fire detection. Furthermore, in harsh environments modern solutions require immunity to any interference, false alarm safety and easy handling. LIOS Technology offers a protection concept based on a simple fibre optic cable as a high–precision addressable heat sensor which is easy to install, maintenance free and certified for several thousand meters. It leaves no space unmonitored and displays in real-time temperature development and heat transport along the entire tunnel. LIOS Linear Heat Detection Systems provide optimum safety for fire detection in tunnels and special hazard areas due to their ability to cope with extreme environmental conditions.

North portal of tunnel Veliki Glozac during fire test

The line sensor is based on optical waveguides, which are immune to electromagnetic disturbances. Based on years of experience within the field of fibre-optic measuring techniques as well as the input of research partners and customers, multiple characteristics were added to offer reliable and adaptable measurement features for locally linear heat detection profiles.

Technologies creating values

Temperatures are recorded as a continuous profile along the entire sensor cable compared to a conventional setup using single point-type sensors. The benefit of achieving highly accurate temperatures over great distances at short measuring times is combined with the ease in installation and data acquisition.

North entrance in tunnel "Mala Kapela" before opening second tube

The LIOS Linear Heat Detection Systems have been developed for serving one purpose – sophisticated fire detection equilibrating response time, false alarm safety and system reliability on an unbeatable level. Based on the LIOS OTS evaluation unit and an appropriate sensor cable the system fulfils the demands of modern fire detection technology.

• A purely passive sensor unaffected by rough conditions and electromagnetic disturbances
• A system architecture that allows stand-alone operation
• Precise information about fire location, size and propagation
• Easy to install
• Easy to integrate in fire management systems

Rim seal fire protection at Lobbau / Schwechat Project, OMV Vienna – Austria

Floating roof tanks are used for the storage of liquid educts and products containing hydrocarbons and originating from petroleum refining and/or petroleum distillation. The essential feature of this type of storage tank is the pontoon roofs which “float” on the stored product and hence also at a low filling level guarantee a storage space with the lowest gas volume.

The floating roof tanks used in the OMV facility in Schwechat and Lobbau are about 25 m high and have a diameter of 80-100 m. Mainly products/educts such as crude oils (Schwechat) as well as light fuel oils and gasolines (Lobbau) are stored in them. All of the compounds stored correspond to classification IIA according to EN 50014/Appendix A.

Design of the annular gap

In order to ensure the functioning of a variable roof, the edge of the roof must not, on the one hand, be rigidly connected to the tank inner wall, on the other, the sealing of the roof edge must be designed as tight as possible in order to prevent excessive evaporation of the product particularly on hot summer days.

This sealing is achieved in Schwechat/Lobbau with the help of a plate that leads around the roof edge and is pressed against the tank inner wall by metal leaf springs. The plate is connected to the pontoon roof via these leaf springs as well as via a sagging piece of rubber (trough) located below it.

As the seal between the roof and the tank inner wall is not hermetically tight (annular gap) and gaseous hydrocarbons have a higher density than air, in this trough (and likewise on the roof) combustible gases collect during normal operation of the tank. Hence the roof surface, and only the roof surface, corresponds to the conditions of explosion protection zone 0.

The concentrations of combustible gases to be assumed on the tank roof are very much dependent upon the atmospheric conditions (temperature, wind forces) as well as on the tank filling level and the product stored.

Hazard potential

Due to the constantly present concentration of combustible gases there is a danger of the ignition of these gases in particular by lightning. In the “worst case” a fire, above all in the rubber trough would result in the trough burning away and thus to the fire penetrating into the tank interior. In order to avoid this in case of emergency, on the upper edge of the tank 12 extinguishing tubes are distributed radially and symmetrical, which within 10 min of a fire alarm being triggered flood the entire pontoon roof of the tank with extinguishing foam (annular gap foaming). The fire detection system to be used is the linear heat-sensitive detector OTS EX. The laser-light carrying sensor cable is in this case routed all round at a distance of about 20 cm above the upper edge of the trough by means of metal holders that are fastened to the cover plate.  The controller and the cable end are located outside of the potentially explosive areas.

Installation of the sensor cable

The sensor cable is routed over the access ladder to the tank. From there the cable is spanned along the descending steps about 5-7 cm parallel to the steam line as far as the steam pantographs and from there to the pontoon roof. The cable holders are located at a distance of 60-80 cm from each other.

In the case of the steam pantographs (“knees”) a play of the cable of about 1.5 – 2 m has been allowed for. This play is located in 3 clips for cable routing. On the pontoon roof the cable is routed along the annular gap at a distance of 10 cm from the inner wall of the tank. The metal holders are arranged at a distance of approx. 100 cm from each other.

The sensor cable is then led back again the same way.

As a result of the large range of the measuring systems of 4 km several floating roof tanks are monitored with one controller (Schwechat 4 tanks, Lobbau 3 tanks). The sensor cable is hence laid from tank to tank. During normal operation, despite the mobility of the pontoon roof s no mechanical strains on the sensor cable occur, as due to the design the cable length remains the same also when the roof moves and the speed of the roof height change is low. Access to the pontoon roof is permitted only in exceptional cases and requires prior checking of the gas concentration present and is hence a very rare event.

Specifications:

• OTS Controller Dimensions(HxWxD): 13.5 cm x 44.9 cm  x 31.5 cm (5,24’’x17,68’’x12,52’’), weigth 10.2 kg
• Range: 2km (OTS 2000) or 4 km (OTS 4000)
• Spatial resolution: 1.5 m to 4 m adjustable
• Power supply 22 – 30V DC max. 50W (Option: 115/230V AC max. 70W)
• Communication Interface: RS 232, SUB-D 9, optically decoupled
• Option: RJ45 embedded Ethernet module
• 4 programmable Inputs, SUB-D 9
• 10 programmable Outputs, SUB-D 25 (Option: 20 Outputs, SUB HD44)
• Operating temperature range: 0°C to 40°C. Relative humidity max. 95% (non-condensing)
• EN 54/5-A1 certified (VdS G 204141)
• ATEX certified (EX II 1 G)

Features:

• Provides the precise location of the seat of the fire even in the presence of strong air currents.
• Provides accurate information about the size of fire and the direction in which it is spreading.
• Automatically activates pre-programmed control sequences such as ventilation, evacuation signalling, adaptation of lighting, etc. via the communication interface.
• False alarms are controlled by precise alarm settings achieved through the use of individual alarm zone layouts and user configurable alarm parameter sets.

Tunnel protection

Accident in tunnels and underground traffic facilities can quickly develop into disasters unless the correct protective measures are taken immediately. The reasons for the high level of risk are increasing traffic densities, the transport of more goods and combustible materials, and the limited space available for rescue and intervention. Furthermore, a small fire in a tunnel tube can spread rapidly within a few minutes due to the influence of wind (draughts, slipstreams, ventilation and natural convection). The rapid spread of smoke and the enormous generation of heat are an immediate threat to life and are often underestimated.

Modern tunnels therefore should be monitored by a fire detection system that immediately identifies an incipient fire and automatically actuates the appropriate protective systems. The OTS 2000/4000 fire detection system locates the fire precisely to within 1.5 – 4 metres and automatically actuates the extinguishing, ventilation and intervention system at the actual site of the burning object. The system also provides informative data about the development and size of the fire and the direction in which it is moving.

These systems have been proven over several years, and their reliability has been repeatedly demonstrated by more than 1000 installations throughout the world. In co-operation with dominant partners in fire safety worldwide, OTS technology has been successfully installed for fire detection in hundreds of kilometres of road and rail tunnels and for numerous other applications.

As the pioneering force, LIOS Technology has established a new standard in modern fire detection.

Read more:

• Tunnel protection - Security systems for underground traffic facilities must respond rapidly and reliably