FDAS_Presentation

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PowerPoint Presentation:

Fire Detection and Alarm System

Conventional Fire Alarm Control Panel:

Two types of FDAS 1. Conventional A conventional fire alarm system is often the natural choice for smaller applications or where budget constraints exist. Conventional systems use zoning to define areas and where detectors are considered as one circuit. Conventional Fire Alarm Control Panel

PowerPoint Presentation:

1. If the total floor area (i.e. the total of the floor areas of each storey) of the building is not greater than 300m2 then the building need only be one zone, no matter how many floors it has. 2. The total floor area for a zone should not exceed 2000m2 . 3. The search distance should not exceed 30m. This means the distance that has to be travelled by a searcher inside a zone to determine visually the position of a fire should not exceed 30m. The use of remote indicator lamps outside doors may reduce the number of zones required. 4. Where stairwells or similar structures extend beyond one floor but are in one fire compartment, the stairwell should be a separate zone. 5. If the zone covers more than one fire compartment, then the zone boundaries should follow compartment boundaries. 6. If the building is split into several occupancies, no zone should be split between two occupancies. 7. It may be an advantage to have manual call points on separate zones to detectors. This will avoid misleading information regarding the position of fire, particularly on staircase landings.

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2. Addressable It is a system which detects fire early, wherein all loop devices in the system are individually addressed to provide the control panel with absolute unique identification of each device. The system monitors any changes caused by dust or smoke and then adjusts the calibration accordingly to maintain each sensor at its original sensitivity. The system carries out a self-test automatically every 24 hours, as well as seprate adjustment for a day and night. The system can be integrated along with building management system, CCTV and Access Control systems ensuring total saftey and security at one central monitoring station.

Addressable Fire Alarm Control Panel:

Maximum area covered by one loop is 10,000 sq m. The code retains the use of zones to indicate the origin of a fire. In addressable systems the detector or manual call point in alarm can be shown by the use of an alpha numeric display . This on its own will not be acceptable and the zone in which the detector/manual call point has operated must be displayed. Addressable Fire Alarm Control Panel

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Different Detector Types and Application: Fixed-Temperature Heat Detector Photoelectric Smoke Detector Rate Of Rise Detector Flame Detector Combination Smoke and Heat Detector

Fixed-Temperature Heat Detector When detector's ambient temperature is reached 58 C (Fixed-Temperature) then the fire signal will be sent to control panel. Detector itself has auto balance function when temperature changed rapidly, so false alarm wouldn't happen. :

Fixed-Temperature Heat Detector When detector's ambient temperature is reached 58 C (Fixed-Temperature) then the fire signal will be sent to control panel. Detector itself has auto balance function when temperature changed rapidly, so false alarm wouldn't happen.

Photoelectric Smoke Detector The infrared light beam from Transmitter intersect the smoke particles will cause the light spread to all directions. When receiver has sensed the light, it will send signal to control panel for fire alarm status as soon as the density of smoke reaches pre-determined alarm level. :

Photoelectric Smoke Detector The infrared light beam from Transmitter intersect the smoke particles will cause the light spread to all directions. When receiver has sensed the light, it will send signal to control panel for fire alarm status as soon as the density of smoke reaches pre-determined alarm level.

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Rate of Rise Detector When detector's ambient temperature rises rapidly and has reached the pre-fire standard (alarm temperature), inside of detector will inflate and then press the sensing diaphragm to conduct the metal contact. Thus, the fire signal will be sent to control panel. Detector itself has auto balance function when temperature changed rapidly, so false alarm wouldn't happen.

Flame Detector When UV tube detect the ultraviolet radiation emitted from weak flame, UV rays pass through the UV glass and strike the cathode, then photoelectrons are emitted due to emission effect. Thus, the air inside UV tube will begin to change and voltage will dropped greatly to produce alarm signal. :

Flame Detector When UV tube detect the ultraviolet radiation emitted from weak flame, UV rays pass through the UV glass and strike the cathode, then photoelectrons are emitted due to emission effect. Thus, the air inside UV tube will begin to change and voltage will dropped greatly to produce alarm signal.

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Combination Smoke and Heat Detector When there is smoke or heat during pre-fire period, field situation will become vary due to different environments. This combination design is to ensure that the pre-fire confirmation will not effected by vary environments.

Manual Pull Station and Alarm Bell:

Manual Pull Station and Alarm Bell

PowerPoint Presentation:

Pull stations/Break glass/ call points should be located on exit routes and in particular on the floor landings of staircases and at all exits to the open air. 2. Break glass call points should be located so that no person need travel more than 30m from any position within the premises in order to give an alarm. 3. Generally, call points should be fixed at a height of 1.4m above the floor, at easily accessible, well-illuminated and conspicuous positions free from obstruction. 4. The method of operation of all call points in an installation should be identical unless there is a special reason for differentiation. 5. Manual and automatic devices may be installed on the same system although it may be advisable to install the manual call points on separate zones for speed of identification.

PowerPoint Presentation:

The following notes give guidance for the correct use of alarm sounders: 1. A minimum sound level of either 65dBA or 5dBA above any background noise likely to persist for a period longer than 30 seconds, whichever is greater, should be produced by the sounders at any occupiable point in the building. 2. If the alarm system is to be used in premises such as hotels, boarding houses etc., where it is required to wake sleeping persons then the sound level should be 75dBA minimum at the bedhead. 3. All audible warning devices used in the same system should have a similar sound and be distinct from any other audible alarms used for other purposes. Except in noisy areas where high performance sounders may be required. 4. A large number of quieter sounders rather than a few very loud sounders may be preferable to prevent noise levels in some areas from becoming too loud.

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5. It is unlikely that sounder noise levels in a room will be satisfactory if more than one dividing wall or door separates it from the nearest sounders. At least one sounder per fire compartment will be necessary. 6. The level of sound provided should not be so high as to cause permanent damage to hearing. 7. The number of fire alarm sounders used inside a building should be sufficient to produce the sound level recommended, but should in any case be at least two.Other requirements include:

Detector Wiring Assembly:

Detector Wiring Assembly

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