Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
24 Cards in this Set
- Front
- Back
|
Name the 3 types of detectors |
1. Heat 2. Smoke 3. Flame |
|
|
What are the 2 types of heat (thermal) detectors? |
1. Fixed temperature 2. Rate of rise in ambient temperature |
|
|
What are the 4 types of smoke detector? |
1. Point type 2. Beam type 3. Air sampling type 4. Residential type |
|
|
Explain point type smoke detectors |
1. Ionisation (uses small radioactive source) 2. Photo electric (uses light source and photo electric cell) |
|
|
Explain beam type smoke detectors |
*Often found in factories *Relies on long shaft of visible or infra red light *Smoke breaks beam. *Able to detect smoke 7.5m to side of beam |
|
|
Explain air sampling type smoke detectors |
*Often found in high rises and hospitals *Used in air handling systems *Monitors air extracted from building *Similar to photo electric type |
|
|
Explain residential type of smoke detectors |
*Either photo electric or ionisation type *Battery powered or hard wired *Legally required in all residences |
|
|
Why are photo electric smoke detectors recommended over ionisation smoke detectors? |
*Photo electric detects smouldering or remote fires earlier *Most residential fires begin as smouldering fires |
|
|
List 2 advantages and 2 disadvantages of smoke detectors |
adv: detects fire through smoke at an early stage adv: low installation cost dis: affected by wind currents dis: less sensitive to flaming fires |
|
|
What is VESDA and what are 3 advantages? |
VESDA: very early smoke detection apparatus adv: constantly sampling air adv: not prone to false alarm adv: can be calibrated for the minute amount |
|
|
Heat detector advantages and disadvantages |
adv: cost effective adv: limited maintenance dis: fire must be well developed to create heat |
|
|
Flame detector advantages and disadvantages |
adv: simple construction adv: Low cost adv: rapid response and high sensitivity to fires dis: susceptible to false alarms dis: poor detection of smoky, low radiation fires |
|
|
Manual call points advantages and disadvantages |
adv: can be used in outside area adv: low maintenance adv: simple operation dis: prone to malicious use dis: person must be present to operate |
|
|
What are some frequent causes of false alarms? |
*welding, cutting, grinding *rainwater in detector *improper installation or maintenance *battery failure *sprinkler head broken |
|
|
Explain the uses of the FIP |
*central connection point for various detection/ suppression systems *indicates activated circuits *isolates bell *may be connected to EWIS (early warning intercom system) *usually contains ASE (alarm signalling equip.) |
|
|
Explain the FIP call procedure |
1. Report to FIP and check ASE 2. LWG (local warning gong) or EWISoperating? Isolate at OIC discretion 3. Identify activated circuit/ status? 4. Send w/back investigation- eg 2ndfloor office 5. Ivestigate area and locate activateddetector 6. Take appropriate action- fire orfalse alarm? 7. Isolate or reset circuit- asapplicable 8. Reset main alarm- check ASE 9. Send w/back and fill out requiredpaperwork 10. Notify owner/ manager and leavepaperwork on scene |
|
|
What are the 4 basic functions of sprinkler system? |
1. Detect presence of fire 2. Attack the fire 3. Contain or extinguish fire 4. Raise alarm for occupants within building (DACR) |
|
|
What are 5 sources of water for sprinklers? |
*Pressure tanks *Elevated private reservoir *Gravity tanks *Ground reservoirs with automatic supply *Town mains (PEG-GT) |
|
|
Types of sprinkler systems |
*Wet pipe *Alternate wet/ dry pipe *Residential *Pre action dry pipe *Dry pipe *Deluge (WARP-DD) |
|
|
What are the 2 types of sprinkler head? |
1. Fusible solder head 2. Sealed glass bulb type |
|
|
What temperature are the following colour sprinkler heads triggered? 1. Orange 2. Red 3. Yellow 4. Green 5. Blue 6. Mauve |
1. orange-57 2. Red-68 3. Yellow-79 4. Green-93 5. Blue-141 6. Mauve-182 |
|
|
Common acronyms |
FIP ASE- alarm signalling equipment VMA- valve monitoring alarm LWG- local warning gong EWIS- early warning intercom system MCP- manual call point BGA- break glass alarm WIP- wardens intercom panel VESDA- very early smoke detection apparatus RAD- return air duct |
|
|
Explain the 9 steps of the sprinkler procedure |
1. Investigate the area of activatedsprinkler. OIC send wordbook 2. At discretion of OIC, turn off LWGand detail a member to stand by sprinkler installation 3. When satisfied sprinklers notrequired, close main stop valve and open drain valve. 4. When drained, replace sprinkler headwith same colour and temp. and check surrounding heads for damage. 5. Close drain valve and lock inposition 6. Open main stop valve very slowly andfully. Padlock in open position 7. Check sprinkler heads for leaks andpump up system using jack pump. Usually 2-300 kpa above combined mainspressure. 8. Open local warning gong (LWG) andlock in open position 9. Check lights on ASE and verify withVKN8 if necessary. |
|
|
COMPONENTS OF SPRINKLER SYSTEMS |
Main stop value Non-return valves Alarm valves Local Alarm Devices (Local Warning Gong) Transponder Retard Chambers Pressure gauges Anti-tamper devices (Valve Monitoring Alarm) Pressure switches/Flow switches Jacking pumps |
