«TM VESDA ECO by Xtralis White Paper Aspirating Smoke Detection (ASD) with Gas Detection and Environmental Monitoring A Reliable and Cost-effective ...»
However, a VESDA ECO system can dramatically simplify installation and maintenance costs, reducing the physical number of gas detectors to an absolute minimum. Careful design of the sampling pipe network, with appropriately spaced sampling points along the length of the pipe, will ensure that the air being sampled far exceeds the toughest of national regulations. It is feasible that only one set of gas detectors may be required (or one set per floor of a multistory facility), mounted where all of the pipes are brought back to the central control point that contains the aspiration pump.
Such a system offers the following advantages:
No expensive electrical cabling to remote areas of the car park No visible apparatus for vandals to target Gas detectors mounted together for one-stop maintenance Integration of fire/smoke detection with atmosphere monitoring A single intelligent dataflow to FLCP, HVAC and BMS to control ventilation and alarms Reduced energy usage by tailored ventilation rates Car Parks — protects against carbon monoxide poisoning and automatically controls vent fans based on detection levels Case Study 3: Tunnels Background Tunnels demand safety and ventilation systems with the highest level of protection. Road vehicle tunnels pose fire and explosion risks from the fuels and goods carried, as well as toxins from the vehicles’ own exhausts – similar to those listed in the prior case study. Train, subway and pedestrian tunnels with huge numbers of passengers in such confined spaces require adequate ventilation with early-stage monitoring for both smoke and breathing air quality. Service tunnels, particularly those used for the transportation of utilities such as piped gas and electricity, present specific hazards because of flammable or toxic gas leaks, oxygen deficiency, overheated cables, and smoldering electrical fires.
Serious incidents continue to take place in tunnels, resulting in the loss of life. The Mont Blanc Road Tunnel disaster and the England-France Cross-Channel Rail Tunnel fires in Europe are two notable examples. Throughout the world, service and utility tunnel emergencies are commonplace and usually involve workers who have to enter confined spaces that have not been equipped with monitoring systems that are installed permanently.
Tunnels tend to be linear structures, so any point-detection systems for smoke or gas monitoring have to be distributed along the length of the tunnel to ensure good coverage and enable fast response to any detectable change.
Conventional technology likely will require a large number of separate detectors with all of the complexities of installing electrical power and signal cables underground. Liquid seepage and collection is another problem that could rule out the installation of conventional, electrical-monitoring equipment.
Page 7 of 8 VESDA ECO by Xtralis White Paper — ASD with Gas Detection and Environmental Monitoring Solution The linear nature of a tunnel lends itself to the installation of an ASD system with appropriately spaced sampling holes along the length of the pipe network. The use of a VESDA ECO system avoids the need to locate sensitive, electricalmonitoring apparatuses in the hazardous section of the tunnel, allowing the ECO detectors to be mounted close to the tunnel entrances or exits – or even outside the tunnel. Longer tunnels can be fitted with several detection ‘sites’ where the apparatuses can be grouped together and connected by a single addressable cable.
In addition to all of the advantages outlined in the two previous case studies (especially the cost of installation), the presence of liquids, whether by seepage, sprinkler or other fire extinguishing systems, does not affect the integrity of the VESDA ECO detector as this equipment will be located some distance away from where any liquid would exist.
Utility tunnels — explosion protection and oxygen-depletion monitoring
Summary Aspirating smoke detection, such as VESDA ASD, is a reliable method for very early warning fire detection. By leveraging a VESDA ASD system, gas detection and environmental monitoring also can be realized. This paper has outlined the challenges of smoke and gas detection in various environments and the mechanisms that ASD employs to overcome these challenges. The combined VESDA ASD and ECO solution provides early warning for both fires and gas leaks in a single, cost-effective package.
About Us Xtralis is a leading global provider of powerful, early warning fire detection and security solutions that prevent disasters by giving users time to respond before life, critical infrastructure or business continuity is compromised.
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