FOAM AND EXTINGUISHERS Flashcards
extinguishers?
water - red
foam- cream
dry powder blue- co2- carbon dioxide
all apliances carry how many extinguishers?
2 9 1 water and 1 dry powder/ foam)
how does foam extinguish fire
diluting isolating forming intercepting cooling
classification of foam
low, medium high
low 2:1 to 20:1 but usually 5:1 to 15:1
high 200:1 to 2000:1 but usually no more than 1200:1
foam application?
gentle
rain down
rolling on
off wall
effectiveness of foam?
concentrate in good condition
correct mixture of concentrate used
good maintenance of equipment
correct pump pressure used for equipment
low expansion foam made from?
Alcohol resistant film forming fluroprot
ein (ARFFF)
safety considerations with foam?
Always open branch away from fire unt
il decent foam comes through
-
If fuel flows, apply to area furthest from fire first
-
Unless fuel is completely encased it may degrade foam and reignite so ensure
enough foam before starting
-
Other areas should be cooled with jets
-
Allow time for fuel to cool b
efore removing foam. Don’t apply water it’ll
break down the foam
-
Don’t walk or take hose through foam as it could reignite if disturbed
-
Buildings containing oil may have foam inlet allowing LX to be pumped into
compartments
-
Flush through all equipment a
fter using foam, special care for filters
what does foam unit carry
1 x 1000L of HX
-
2 x equipment stillages carrying one Turbex HX foam generator
and two foam
monitors and all ancillary connecting equipment
what is foam mixute used for
hydrocarbons and polar solvents
what can vary in production of foam?
1.
Volume of air mixed with volume of solution
2.
Quantity of foam concentrate adde
d
3.
Size of the bundles (med & high only)
roof ladder specs
14kg, 4.6m and 13 rounds
two type of water extinguisher
chubb ( 15 bar) 12 bar ( angus)
duaration of extinguishers?
water 70 secs
foam 45s
dry powder 15s
discharche rate
water min 95%
foam min 95%
dry powder min 95%
