Basics of fire alarm systems and bildge alarm systems in sri lanka navy crafts. Also included spares what are using and construction of photoelectric smoke detector.
3. 3
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
EA IV TA SENEVIRATHNA
10. 10
INPUT DEVICES
Manual call point
When shorted trips an alarm (usually fire)
Installed in the normal exit path
Types of manual call points
Single Action
Pull handle once
Break Glass
Glass rod or plate is broken
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11. 11
TYPES OF MANUAL CALL POINTS
BREAK GLASS PULL HANDLE ONCE
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12. 12
PHOTOELECTRIC SMOKE DETECTOR
Uses 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 Chamber
2: Cover
3: Case Moulding
4: Photodiode (Detector)
5: Infrared LED
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13. 13
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
14. 14
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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15. 15
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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16. 15
• 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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18. 18
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
EA IV TA SENEVIRATHNA
23. 23
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:
Sirens
Bells
Buzzers
Horns
Voice Drivers
EA IV TA SENEVIRATHNA
24. 24
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
EA IV TA SENEVIRATHNA