Fire alarm systems, Other Engineering

Fire alarm systems:

All buildings require a means by which the warning  of  fire  can  be  given  to  all occupants.  In the very smallest premises this might be achievable by shouting 'Fire!' but in all other buildings there will be a need for an electronic system to raise the alarm throughout the building.

The systems have to be completely reliable so they usually contain their own back-up battery power supply so that they can work even if there is a power cut. Sounders have to be loud enough to be heard by everyone.  

In very noisy buildings it is sometimes  necessary  to  install flashing  beacons  to  give  the  warning  signal. Sometimes the sounders are deliberately very loud so that they are uncomfortable and drive occupants out of the building.  This is thought, by some, to be necessary because some occupants canbe very reluctant to evacuate and will carry on doing what they were doing before that alarm sounded.                                    

Sounders should not be so loud to cause damage to the ears and some standards specify 120dBA as the maximum sound level allowed.  Sounders should be kept away from the area that is occupied by the person who is expected to call the fire service in the event of an emergency. The fire alarm does not generally have to be very loud in the staircases.

Where there is a possibility that a fire can go un-noticed by the occupants it is often necessary to install automatic fire detection.   The most effective detection is smoke detection but this can be vulnerable to steam, dust, insects and other contaminants and in  areas  where  this  might  cause false  alarms it  will  be  necessary  to  install  heat detectors instead of smoke detectors.


Posted Date: 10/22/2012 6:33:04 AM | Location : United States

Related Discussions:- Fire alarm systems, Assignment Help, Ask Question on Fire alarm systems, Get Answer, Expert's Help, Fire alarm systems Discussions

Write discussion on Fire alarm systems
Your posts are moderated
Related Questions
When should stock rather than debt to fund its operations? There are several reasons for an organization to problem inventory rather than financial obligations. The first is if

BURNERS :  ATOMISER BURNERS This type of burner presents the fuel in a finely atomised spray by forcing the fuel to pass through a small orifice. The size of the orifi

i am doing be in mechanical engg in india. so can i do my masters in geoophysic ?

Q. Describe the complete procedure of testing permeability of moulding sand. How is permeability influenced by various parameters of the moulding sand ? Ans. Permeability

What is Networth? Networth is the complete resources without complete obligations of an organization. Networth means equity and it is the present resources without present oblig

Illustrate the importance of communication in a retail business organisation?25 marks

Suppose you are managing a software-development project for which reliability is a major concern. A continual stream of anomalies is discovered in the software during the testing p

These can be divided into several categories. Turbojet engines. The turbojet was the first type of jet engine developed. In this engine all the air passes through the core engin

The following is the capital structure of X Ltd. as on 31st Dec 2003 Rs in m

Interest Rate Calculations In considering the time value of money, it is convenient to represent mathematically the relationship between the current or present value of a sing