Fire alarm systems, Other Engineering

Assignment Help:

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.

 


Related Discussions:- Fire alarm systems

Balanced investment strategy, Balanced Investment Strategy Portfolio manage...

Balanced Investment Strategy Portfolio management strategy where all assets are owed with the aim of avoiding excessive risk by diversifying investment athwart different asset clas

Cold shunt and misrun casting, Q. Discuss briefly the causes and remedies o...

Q. Discuss briefly the causes and remedies of misrun and cold shunts casting    Cold Shunt and Misrun : When the metal is unable to fill the     mould cavity completely and t

Water distribution, examples dead end water distribution system

examples dead end water distribution system

Production Inventory Control, Modular Forniture Company manufactures two ki...

Modular Forniture Company manufactures two kinds of couches: Suede and Leather. The forecasted demand for

Matlab, The 3 sum problem: (20 pts.) Provided a 1D array of integers, find ...

The 3 sum problem: (20 pts.) Provided a 1D array of integers, find all combinations of 3 values from this set such that: a+b+c=0 For example, if one were provided with the set [3 1

Blow hole and pin hole porosity, Blow Holes                    (i) Exc...

Blow Holes                    (i) Excessive moisture in the moulding sand.                   (ii) Low permeability and excessive fine grain sands.                   (iii

Propeller shafts, PROPELLER SHAFTS Most modern engines, both reciprocat...

PROPELLER SHAFTS Most modern engines, both reciprocating and turbine, have flanged propeller shafts. Some of these flanges have integral internally threaded bushings that fit

Cost of debt, A company issues 15-year, $1,000 par-value bonds, with a coup...

A company issues 15-year, $1,000 par-value bonds, with a coupon rate of 5%. The bonds are sold for $619.70. The tax rate is 30%. Compute the cost of debt before taxes and after tax

Fluid cleaning in cold section inspection of aircraft, Fluid Cleaning T...

Fluid Cleaning This procedure involves spraying an emulsive type surface cleaning fluid into the compressor whilst the engine is turning either on the starter motor or at low R

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd