Chapter 17 Flashcards
Gasoline has a flashpoint of approx?
-45 F
Diesel fuel has a relatively high flash point, usually?
Above 100 F
Class B foam works in what 4 ways?
Smother
Separate flames
Suppress vapor
Cool surrounding surfaces
Protein and Fluoroprotein foams consists of products from a protein hydrolystate, they produce what type of foam blanket?
Thick
AFFF usually produces what type of blanket?
thinner, more fluid.
Foam for suppression of flammable liquid spill fires is usually referred to as?
Low expansion foam
Low expansion foam ratio
20:1
Medium and high expansion foam ratio range?
20:1 to approx 1,000:1
The handheld appliance most critical to the production of foam is typically referred to as?
Inline eductor
The discharge or male thread of an inline eductor is normally? The intake or female coupling may be either?
male- 1 1/2
female- 1 1/2 or 2 1/2
Two important points for first responders when selecting discharge outlet for inline eductor?
siphon tube will reach bottom
and
someone available to switch tube
If pump operator is assigned to switch siphon tube. Best location for eductor?
in proximity of pump panel
Two characteristics of inline eductors often overlooked by responders?
required minimum inlet pressure
and
Max length of hose
For some inline eductors, maximum length for 1 3/4 may range from
500-700 ft.
Most pre-connected lines are?
150-200 ft.
A spill fire is defined as a spill that is not contained in a dike with an average depth that does not exceed? and Bound?
1 inch
Only by the contour of the surface which it is laying
Minimum application rates are available from the NFPA standard?
11
AFFF minimum application rate for non-diked spill fires?
0.1gpm per sq ft.
Protein and Fluroprotein foam application rate?
0.16gpm per sq ft.
First responders attempting to extinguish a spill fire should be prepared for a discharge time of?
15 mins.
What is the key to foam pre-planning?
Knowing when to delay fire attack
Increasing the foam application rate above the NFPA minimum will not allow FR to extinguish a larger fire, but it can?
Reduce the time required to achieve control
Most FR attempting to extinguish a flammable liquid spill fire with a hoseline will achieve satisfactory results by aiming the nozzle where?
Just in front of the leading edge of the fire, roll or push it on.
The stream of a foam nozzle should never be?
directed into burning fuel
To assure effectiveness of a foam blanket it is vital that FR?
Refrain from walking or otherwise disturbing the blanket
What should be used to detect presence of flammable vapors?
Atmospheric monitors
