FIRE ALARM & BILDGE ALARM SYSTEM

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FIRE ALARM SYSTEMS

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WHY ARE FIRE DETECTION AND ALARM SYSTEMS REQUIRED?

Detect fire in the areas.Notify building occupants to take evasive action to escape the dangers of a

hostile fire.Summon organized assistance to initiate or assist in fire control activities. Initiate automatic fire control & suppression systems & to sound alarm.Supervise fire control & suppression systems to assure operational status is

maintained Initiate auxiliary functions involving environmental, utility & process controls

Systems may incorporate one or all of these functions

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BLOCK DIAGRAM OF SYSTEM

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FIRE ALARM SYSTEM DIAGRAM

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FIRE ALARM PANEL

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HEAT DETECTORS

1. fixed temp type heat detector

2. rate-of-rise type heat detector

SMOKE DETECTORS

1. Photoelectric

2. Ionization

FLAME DETECTORS

1. Ultraviolet light (UV)

2. Infrared (IR)

FIRE-GAS DETECTORS

INPUT DEVICES

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INPUT DEVICES

Heat Detectors Smoke Detectors

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INPUT DEVICES

Manual call pointWhen shorted trips an alarm (usually fire) Installed in the normal exit path

Types of manual call pointsSingle Action

Pull handle onceBreak Glass

Glass rod or plate is broken

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TYPES OF MANUAL CALL POINTS

BREAK GLASS PULL HANDLE ONCE

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PHOTOELECTRIC SMOKE DETECTORUses a photocell coupled with a specific light source.Basically smoke entering the smoke detector chamber

disrupts the light beam causing an alarm signal to be initiated.More sensitive to smoldering fires

1: Optical Chamber2: Cover3: Case Moulding4: Photodiode (Detector)5: Infrared LED

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AUDIBLE OUTPUT DEVICES

An audible alarm signal lets people know the alarm system has

been activated

Devices may be mounted inside or outside based on level of

protection required

May consist of: Sirens

Bells

Buzzers

Horns

Voice Drivers EA IV TA SENEVIRATHNA

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VISUAL OUTPUT DEVICES

A visual signal lets users know the status of the alarm system if

activated

Visual devices may be mounted inside or outside

May consist of...

Strobe lights

LED’s

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DETERMINING LAYOUT OF THE FIRE DETECTORS

• The design, construction and operational features of all types of detectors shall be in accordance with relevant standards.

• The number of fire detectors to be installed is governed by• total area to be protected• type of ship construction• air movement & air velocity• panelling obstructions• concentration of equipment in the area covered• sensitivity required

• Area is divided into zones to be protected• The zones of individual detectors should overlap and no blind

zone should be left.

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• Areas above false ceiling and below false flooring shall be considered as separate zones.

• Under ideal conditions of smooth ceiling and average room size, one detector is recommended to protect the area.

• Ionisation type detectors should be located where the largest combustible gas concentration can be expected.

• In the air conditioned areas both ionisation and optical type smoke detectors are used.

• Detectors must always installed at the highest point of the ceiling and minimum coverage indicated by manufacture shall be considered.

• The number of detectors and their location should be so selected that complete coverage is obtained

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BILDGE ALARM SYSTEMS

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WHY ARE BILDGE ALARM SYSTEMS REQUIRED?

Detect flooding situations in the areas.Summon organized assistance to initiate or assist in fire control

activities.Initiate automatic bildge control & suppression systems & to

sound alarm.Supervise bildge control & suppression systems to assure

operational status is maintained initiate auxiliary functions involving environmental, utility & process controls

Systems may incorporate one or all of these functions

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SIMPLE BLOCK DIAGRAM OF BILDGE ALARM SYSTEMS

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BILDGE ALARM PANEL

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BILDGE ALARM PANEL INPUT & OUTPUT TERMINALS

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INPUT DEVICES

FLOATER SWITCH

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AUDIBLE OUTPUT DEVICES

An audible alarm signal lets people know the bildge alarm system has been activated

Devices may be mounted inside or outside based on level of protection required

May consist of:SirensBells BuzzersHorns Voice Drivers

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VISUAL OUTPUT DEVICES

A visual signal lets users know the status of the alarm system if activated

Visual devices may be mounted inside or outsideMay consist of...

Strobe lightsLED’s

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QUESTIONS???

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