1 system design. 2 primary detection secondary detection standards pipe design
TRANSCRIPT
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System Design
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System Design
• Primary Detection
• Secondary Detection
• Standards
• Pipe Design
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Primary Detection
Where smoke will travel when air
conditioning is operating
• Air handling units
• Duct detection
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Primary Detection
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Primary Detection
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Secondary Detection
Where Smoke is likely to travel when air conditioning is
shut down or not installed
• Ceiling level detection
• In cabinet detection
• Void detection
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Secondary Detection
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Standards
• BS5839 Pt 1 CoP for Fire Alarm Systems in Buildings
• BS6266 CoP for Fire Protection for Electronic Data Processing installations
• BFPSA CoP for Category 1 Aspirating Detection Systems
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Siting Conventional Detectors toBS5839 Pt1 (Secondary Detection)
7.5m• Maximum size for fire zone is 2000m2
• Maximum area coverage per detector 100m2
• Grid overlay design concept gives spacing 5 m from walls - detector spacing 10m maximum
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Conventional Detector Layout (Secondary Detection) BS5839
5m 10m 10m 10m 10m 5m
5m
FIRE ZONE PLAN
10m
10m
10m
5m
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HSSD Layout (Secondary Detection) BS5839
Sample Holes
Sampling pipes
5m 10m
10m 10m 10m 5m
5m
FIRE ZONE PLAN
10m
10m
10m
5m
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Siting Conventional Detectors toBS6266 EDP Areas & High Airflow
Application Recommended coverage per detector Remarks and recommendationsEDP equipmentroom (ceilingheight about3m)
15 m sq. to 25 m sq. (see note) In the extreme case where theearliest possible warning of firein a cabinet is required, there isno substitute for detectors withinthe cabinet.
Without ventilation:20 m sq. to 30 m sq. (see note)
In false ceilings with beams thelower figure should be taken. Ifthe beams are deep so as tocompartmentalize the space, adetector should be fitted in eachsuch compartment
False floors,false ceilings
With Ventilation:(a) between 15 m sq. and 20 m sq. (see
note) for air velocities of 4 m sq. orless
(b) 10 m sq. for air velocities greater than 4 m/s
Tape stores Room protection, 10 m sq. to 30 m sq.(see note)
Electricaldistributionboards andemergencypower supplies
Room protection, 10 m sq. to 30 m sq.(see note)
In installations with enclosedemergency power cabinets,consideration should be given toproviding additional protectionby the installation of detectorsinside the cabinet.
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Siting Conventional Detectors toBS6266 EDP Areas & High Airflow
NOTE: Where the risk justifies the extra cost involved, or the maximum response to fire is required, or as ventilation rates increase, the area of coverage per detector should be reduced.However, under these circumstances, the higher area coverage may still be acceptable if the point - type smokedetectors are supplemented by a high sensitivityaspirating system that forms part of the fire alarm system.
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Siting Conventional Detectors toBS6266 EDP Areas & High Airflow
• Maximum size for fire zone is 500 to 750m2
• Maximum area cover per detector 25m2
• Grid overlay design concept gives 2.5 m from walls - detector spacing 5m maximum
5m
5m
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Conventional Detector Layout (Secondary Detection) BS6266
2.5m 5m 5m 5m 5m 2.5m
2.5m
FIRE ZONE PLAN
5m
5m
2.5m
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HSSD Layout (Secondary Detection) BS6266
Sampling pipes
FIRE ZONE PLAN
Sample Holes
2.5m
5m
5m
2.5m
2.5m 5m 5m 5m 5m 2.5m
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HSSD Duct samplingReturn air pipe
HARTDetector
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AIRTIGHT FITTING(EG. GROMMET)
2mm DIAMETER SAMPLING HOLES
SAMPLE TUBE
RETURN TUBE
AIRFLOWDetailed view of Duct pipework
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HSSD Air Handling Unit Sampling (primary)Samplingpipe
HARTDetector
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Sampling pipe centred on grilleEnd Cap
Grille
Distance from grille must be such that air velocity less than 6 m/s
Air Handling Unit Sampling
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Air Handling Unit
To HARTdetector
Samplingholes
Airflow out
False floor
Airflow in
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Air Handling Unit
Sampling holes
False floor
To HARTdetector
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Balanced sampling system
AHU Cabinets
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In Cabinet sampling
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In-cabinet Sampling from Underfloor Void
Equipment
cabinet
Sample tube can detect at different heights
Sample tube enters cabinet from underfloor trunk sampling pipe
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Sampling a Ventilated Equipment Rack
Sampling Pipe
Ventilation grille
Sampling points (Facing into airflow)
Equipment Rack
Airflow Direction