Study session part 2

Question 1

Foam application considerations

Answer 1

Application Considerations
Think about the following factors before you begin to apply foam.

Compatibility: Is the foam compatible with other firefighting chemicals being used?

Adverse Weather Conditions: Weather can greatly affect the extinguishing potential of finished foam. Is it too cold for the concentrate to work properly? What is the speed and direction of the wind?

Intense Heat: Intense heat can accelerate the drain time of the finished foam, raising the possibility of burnback.

Toxic Fumes: Will the foam create toxic fumes when it is applied on the liquid?

Re-ignition: What are the possibilities of re-ignition with the type of foam produced? Re-ignition is a direct result of the foam blanket being destroyed in one or more locations, allowing ignitable vapours to escape.

Question 2

4 methods foam is proportioned

Answer 2

induction: in line educator

injection

batch mixing

premixing

Question 3

Methods of detection?

Answer 3

Fixed temp detection

rate of rise

smoke

flame or flash

vapor

Question 4

alarm categories

Answer 4

hydraulic

electric

Question 5

2 types of application systems

Answer 5

manual

automatic

Question 6

types of sprinkler systems

Answer 6

wet pipe
dry pipe
pre action
deluge
residential
special extinguishing system

Question 7

sprinkler head mechanisms

Answer 7

frangible bulb
fusible link
chemical pellet
quick response type

Question 8

common control valve

Answer 8

 Outside screw and yoke valve (OS&Y): This valve has a yoke on the outside with a threaded stem that controls the opening and closing of the gate. The threaded portion of the stem is out of the
yoke when the valve is open and inside
the yoke when the valve is closed.

 Post indicator valve (PIV): The PIV is a hollow metal post that is attached to the valve housing. The valve stem is inside the post. There is a movable target on the stem with the words “Open” and “Shut” at the opening.

 Wall post indicator valve (WPIV): Similar to a PIV except that it extends through the wall with the target and valve operating nut on the outside of the building.

 Post indicator valve assembly (PIVA): The PIVA does not use a target with the words OPEN and SHUT, but it has a sight area that is open when the valve is open and closed when the valve is closed

Question 9

types of standpipe systems

Answer 9

auto wet
auto dry
semi auto dry
manual dry
manual wet

Question 10

maximum pressure for standpipes is ______ kpa, and _______ Kpa

Answer 10

2100

1050

Question 11

types of elevators

Answer 11

split bank

blind shaft

freight