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Product Description
The ASD Suppression Actuation Threshold (ASAT) Calculator is a simple to use software tool for the calculation of VESDA detector fire alarm thresholds. Determination of the appropriate fire alarm settings for suppression actuation is anticipated as the most common use for this tool, however, it could also be used as a guide to setting suitable thresholds for evacuation annunciation, Fire Brigade notification, automated equipment shutdown, HVAC or smoke management system control.
The calculations, performed by the tool, account for the particular environmental conditions within an area and are based on validated models.
ASAT Calculator
Suppression Release At The Right Time
In mission critical environments such as telecommunications facilities and computer server rooms, smoke and fire damage must be minimized to avoid the costs associated with the loss of business continuity, essential services and assets. Although the very early warning capabilities of VESDA detectors will most often ensure adequate time for investigation and action, making suppression release unnecessary, there are situations where reliable suppression release is essential, in unmanned facilities for example. Timely suppression release, with an appropriate VESDA alarm threshold, will not only ensure cost minimization via damage reduction but also by safeguarding against expensive and unnecessary suppression dumps.
The air movement within mission critical environments creates detection difficulties by rapidly diluting the smoke and diverting it away from ceiling mounted detectors. Delayed detection means late suppression and more damage. The active, cumulative, air sampling performed by VESDA detectors throughout the protected area overcomes this problem, enabling earlier and more reliable detection. The ASAT Calculator factors in the airflow and room geometry when calculating VESDA alarm thresholds so untimely suppression release, either too early or too late, is prevented.
Simple Design of Coincidence Detection Schemes
Coincidence detection is a common design practice which is stipulated in many local codes when a detection system is used for suppression system actuation. There are several configuration schemes for coincidence detection with a VESDA system:
- Two VESDA detectors with their sampling pipes alternated.
- One VESDA detector sampling the exhausts of up to four other VESDA detectors.
- A combination of VESDA detectors and spot-type heat or smoke detectors.
- Two VESDA detectors, one on the ceiling or in the floor void and the other across the return air vent of the HVAC system.
- One VESDA LaserSCANNER using two adjacent sampling pipes.
- One VESDA detector with two alarm thresholds.
Optimized Fire Protection Solution
VESDA detector multiple alarm levels can be set over a wide range of sensitivities; high for very early warning, lower for suppression system actuation. With the ASAT Calculator to provide spot-type detector equivalent VESDA suppression actuation alarm thresholds, the same technology can now be used for very early warning smoke detection and suppression actuation, hence drastically optimizing the overall detection system design and cost of the fire safety system.
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