Fire safety Design

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The construction of the house has to be done such that in the event of a fire , people can escape to a place of safety outside the house at all times without any obstacle. This involves giving proper and early warning to the residents about the fire incidence, safe routes of sufficient capacity which enable the residents to escape easily, the routes being fire resistant and easily accessible. These warnings and escape strategies for this house are described as follows.
The new house is proposed to have a sufficient number of smoke alarms and automatic fire detection systems according to British Standards – BS – 5839 – 6: 2004. The following discussion gives the positional design of these fire detection and warning systems.

Smoke detector alarms have to be installed in the circulation space between the kitchen and lounge on the ground floor and in the entrance of bedroom 3 – near the roof access area on the first floor. Instead of the ionization chamber, smoke detectors, optical ( photoelectric ) smoke detectors are recommended because optical smoke detectors can distinguish invisible small particles of kitchen fumes from fire flames. This reduces the chances of false alarms.

The recommended specifications for these optical smoke alarm are to be Schottky diode in the base , 15 – 30 V operating DC, around 60μA stand by the current at around 22 V DC, magnetic testing facility and with a level of protection as LP – 40.

An additional interlinked heat detector or alarm has been proposed for the kitchen, the specification of these include a Thermistor sensor with a sensing range of 50 degrees C to 70 degrees C, operating voltage – 230 V at 50 – 60 Hz, alkaline battery backup, solid-state indicator lights, 85 dB at 3 m alarm sound level . &nbsp.