Chapter 28 Class B fires

Question 1

USDOT AND TDG FLammable liquid range

nfpa and whimis

Answer 1

60. 5 degrees c

37. 8 degrees c

Question 2

fires in open topped tanks?

Answer 2

boilover
slop over
froth over

Question 3

Fire and explosion prevention

Answer 3

Exclusion of ignition sources
exclusion of air
storage of liquids in closed containers or systems
Use of inert gas atmosphere instead of air
ventilation to prevent accumulation of vapor within the flammable range

Question 4

extinguishment of ignitibal eliquid fires

Answer 4

shutting off the fuel supply
cooling the liquid to stop evaporation
excluding air by various means
a combination of these methods

Question 5

pressurized gas characteristics

Answer 5

Pressure
diffusivity (trendency to spread freely)
low boiling point
colorless and/or odorless
creates static electicity when flowing

Question 6

safety relief valves

Answer 6

safety or pressure relief valves
rupture disc
fusible plug

Question 7

manual control valves

Answer 7

hand wheel

stem valve

Question 8

gas cylinder color coding

Answer 8

Green/silver - o2
blue - nitrous oxide
orange - cyclopropane
brown - helium
red - ethylene
grey - carbon dioxide

Question 9

release of contents
3 stresses
and 9 container breachs

Answer 9

thermal
mechanical
chemical

attachments open up
disintergration
detonation
puncture
runaway cracking
rapid relief
spill/leak
split/tear
violent rupture

Question 10

3 types of containers - pressure vessels

Answer 10

cylinders, lines, tanks

Question 11

LPG boiling range and press range

Answer 11

-90 to -1.1 degree c

170 - 17000kpa

Question 12

safe havens

Answer 12

ground cover
low lying areas
buildings
treed areas
fire pumper or truck
fog nozzle stream

Question 13

BLEVE

Answer 13

boilind liquid expanding vapor explosion

Question 14

warning signs potential BLEVE

Answer 14

 Pressure relief device is working
 Pitch or sound gets louder
 Pinging, popping, or snapping sounds are heard
 Visible steam from tank upon cooling – 100 C
 Discoloration of shell at impingement
 A buldge or bubble indicates serious localized heating of vapor area

Question 15

naturagl gas concentratino

Answer 15

5-15 percent

Question 16

ignition temp of propane

Answer 16

450 degrees c

Question 17

generating and aplpying foam 3 steps

Answer 17

proportioning
foam generation
distribution

Question 18

AR-FFFP

AFFF

Answer 18

alchohol resistant film forming fluoral protien

Aqueous film forming foam

Question 19

.1
.1-.5
.5
1.0

Answer 19

deep seated fires in furniture, smouldering ground fires

wildland/grassfires

structural ff with fog nozzles or wild land foam nozzle

protecting structures exposursres, forming barres during wildland ff operations

Question 20

1
3
6 percent

Answer 20

shallow hydrocarbon spills

severe hydro carbon and polar solvent fires

for hazmat vapor suppression

Question 21

4 methods foam is proportioned

Answer 21

induction, injection, batch mixing, pre mixing

Question 22

2 types of application systeams for foam

Answer 22

manual system - eductor and playpoipe

automatic system - build into new salisbury pump

Question 23

max pressures when using eductor

Answer 23

The pump pressure at the eductor must be 1400 kPa to create the ‘venturi’ effect

 The high pump pressure at the eductor (1400 kPa) creates a lesser pressure within the eductor which allows the foam to be pushed up (drawn into) the tube by the atmospheric pressure to mix with the water being discharged

 From the eductor (whether located at the pump panel or at mid-length), the maximum length of 44mm hose that can be utilized is 60 meters , or four lengths

 If more length (greater than four lengths after the eductor) is required to allow the playpipe to reach the area involved, then the lengthening will be added between the pump and the eductor

 Make sure there is a firefighter to drop, and change, the eductor tube into the container when it is not at the pump

 In order to reach the ‘at-the-eductor’ pressure of 1400 kPa, the pump operator must start with a pump pressure of 1400 kPa and increase the pump pressure depending on the number of 65mm hose lengths being used between the pump and the eductor (add 50 kPa for each 15 meter length of 65mm hose)

 Final pump pressure in kPa = 50 (# of Lengths of 65mm hose) + 1400

 The maximum pump pressure to be utilized for this purpose is 2100 kPa

 It is advantageous to have the eductor and foam container at the pump as the pump operator can do both, and don’t have to carry containers to the location of the eductor

Question 24

foam application techniques

Answer 24

roll on

bank down

rain down