module 15 Flashcards
why is FFE provided ?
.. First aid fire fighting
Securing the means of escape?
Legal requirement
what is the BS for extinguishers?
BS 5306 part 8 2012
what are the 4 main extinguisher types?
water
dry powder
CO2
Foam
explain extinguisher rating?
.. Extinguisher Ratings
•Extinguishers are rated for the size of fire that they can extinguish. The results are given as A & B ratings. Extinguishers can have a rating for either or both.
•A traditional 9 litre water extinguisher is rated as 13A.
typical extinguisher rating?
water
9L = 13A, 6L = 8A, 6L with additive 21A, 3L with additive = 13A
foam-
9L = 21A ( 233B) , 6 L = 13A ( 144B) and 2L = 5A ( 89B)
powder:
9kg = 43A ( 233B) , 6Kg = 34A ( 233B) , 3kgs = 21A ( 89B)
co2:
5kg = 70B and 2kg = 34B
wet chemical :
6L = 75 F 6L = 13A
what is the formula for calculating extinguisher coverage?
. Calculate overall ‘A’ rating required for each floor using the formula:
Floor area x 0.065 = ‘A’ rating
- Floor area in m2
- 0.065 is a constant
- Minimum ‘A’ rating is 26.
example of floor coverage and extinghsers required
Therefore, for a building 40m x 40m, the ‘A’ rating would be
1600 x 0.065 = 104A
To estimate how many 9 litre water (13A) extinguishers are required, the overall ‘A’ rating is divided by 13:
104 13 = 8
So 8 13A extinguishers required
what is the minimum rating for most floors?
26A
minimum rating for floors under 100 M2 ?
13A with risk assessment
siting of extinguishers should be ?
near exits
on exit routes
within 30 M travel distance of any point of building
near specific risks
what is the formula to calculate extinguisher coverage? and calculate A rating
0.065
formula to calculate flammable liquid spills and extinguisher requirements?
max spill = 10 ltrs
10 x 10 = 100
100B extinguisher required.
FFE Placement should be ?
bracket or otherwise suitable base with the handle at a suitable height
up to 4kgs = 1.5 M
over 4 kgs. = 1M
advantages and disadvantages of water
.. Advantages
•Cools & extinguishes solid fuel fires quickly & safely
•Can be used as a jet or a spray
Disadvantages
•Must not be used on electrical fires or cooking oils/ fats (flammable liquid fires).
advantages and disadvantages of foam?
.. Advantages
•Cools & smothers fires
•Can be used on flammable liquid fires, i.e. running fuel fires
Disadvantages
•Not to be used on chip pans
•If foam blanket breaks, re-ignition may occur.
advantages and disadvantages of dry powder
.. Advantages •Can be used on class A, B & C fires •Safe to use on electrical fires Disadvantages •Does not cool, so fires may re-ignite •Messy in operation •Do not use on chip pans.
consideration when using dry powder ?
.. Avoid inhaling powders, especially if chloride based
•Beware of re-ignition when the extinguisher is expended
•Wind & moisture will affect efficiency outdoors
•Visibility will be reduced
•Powders always create a mess
•Although they are non-conductors, they will damage delicate electrical equipment.
advantages and disadvantages of Co2?
.. Advantages •Ideal for electrical fires when power cannot be isolated •Can be used on class B fires Disadvantages •Very little cooling capability •Noisy in operation •Visibility may be impaired •Discharge horn becomes cold.
inspection periods ?
water and water based:
12 month, extended service 5 years
Dry powder :
12 month, extended service 5 years
powder primary sealed:
12 month, extended service 10 years
Halon:
12 month, and overhall every 10 years
CO2 :
12 month, and overall every 10 years
