Ch. 4 Hoseline Selection, Stretching And Placement Flashcards Preview

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Flashcards in Ch. 4 Hoseline Selection, Stretching And Placement Deck (55)
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1

Method of stretch determined by such factors as: (3)

Presence of Standpipes.
Open stairwells.
Usable courtyard windows

2

Two criteria to determine what size hoseline:

Required volume.
Reach/penetration

3

% of fire deaths that occur in residential buildings

75%

4

Gpm for 1 1/2", 1 3/4", and 2"

125, 180, 225

5

When relating to reach of fire streams, Large-area buildings are _______ in width or depth.

Over 75 feet

6

Very common structure across US is one-story commercial building of ordinary construction called:

Strip mall or "taxpayer", typically 20 x 75 feet

7

How much hose is enough?
Good rule of thumb is:

Width of bldg plus depth of bldg plus 1 length for each floor above or below the level that the fire is on.

8

Taboo to stretch a handline directly off the end of a ladder pipe/outlet on a platform UNLESS: (2)

fire is in its final stages.
line strictly used for overhauling.

9

The job of the engine company: (4)

Putting PROPER size line at REQUIRED place in LEAST possible time with most EFFICIENT use of personnel

10

Using rope stretch (multi-level), the hoseline is brought back into the building: (2)

Either: floor below the fire OR
into a stairway window at midpoint between fire floor and floor below, then advanced to fire floor

11

For fires above grade/ground, you can stretch a dry line:

3rd floor OR HIGHER before calling for water

12

Items to consider with deciding interior operations or exposure. (3)

Extent of fire (besides life hazard).
Attack capability of unit.
Construction of bldgs, particularly exterior siding

13

Flow rates of __________ are available for handlines.

12-325 gpm

13

For operation of cellar nozzles: (4)

Use early.
Only darkens, doesn't put out.
10 in x 10 in hole needed.
Have to hook up to 2 1/2 in. (Not preconnected)

15

3 characteristics of Cellar/Baker

-50 ft of reach
-constantly manned
-1 or 2 directions

And a gate valve 50 ft back

16

3 characteristics of Bresnan distributor/revolving

-15-20 ft of reach
-unmanned
-Circular pattern spray

17

Bent APPLICATOR uses

AFFF (class B).
Dry-chem (small fires-remove fog tip).
Water (airbags under vehicles)

18

High-expansion foam is _________ solution of water and DETERGENT:
Ratio of _____ - ______

Extremely expanded.
400:1 - 1,000:1

19

High-ex foam's primary function is to:

Fill an enclosure

20

Residential occupancy at flashover stage, a hoseline of at least _____ diameter is required

1 1/2 in.

21

Residences have three characteristics that play an important role when selecting hoselines:

Need for speed.
Relatively low fire loading.
Presence of dividing walls/partitions.
-Reduce extent of involvement.
-Walls can be obstacles to hoseline advancement

22

Nozzle does several things: (3)

REGULATES flow (ball valve).
INCREASES velocity.
Gives stream its SHAPE

23

Asphalt siding aka

Gasoline siding

24

As a rule of thumb, no nozzle should have an opening greater than _____________.

EXCEPTION:

Half the diameter of its supply. Fog as well as solid tips

Stretch is kept short and discharge pressure is raised SUFFICIENTLY high.

25

Most versatile style of nozzle is ___________.

Variable-pattern, peripheral fog nozzle

26

Break-apart nozzle advantages

Ensures rapid placement of tip.
Allows line to continue to operate while tip is brought

27

Two main types of fog nozzles:

Constant-gallonage and constant-pressure

28

Constant-gallonage is a misnomer. It refers to the effect _____________

That a change in stream position has on the flow

29

Constant-gallonage nozzle
A _____ amount of water flows out of the opening regardless of ____________. ______ is constant as long as nozzle pressure remains constant.

Constant, stream position.
Gallonage

30

Constant gallonage
Usually designed to deliver a specified gallonage when the nozzle pressure _________.

Is 100 psi