Ch. 4 Hoseline Selection, Stretching And Placement Flashcards Preview

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

31

Constant gallonage nozzle
Good idea always to ensure that when beginning operations, the _________ is at the nozzles maximum flow.

Manual setting

32

This nozzle uses a spring to regulate the size of the discharge opening, as the spring counters the nozzle pressure.

Constant pressure or automatic nozzle

33

Constant pressure (automatic) nozzle
The spring should maintain __________, as long as the flow past the spring is within the nozzles design operating range. Can flow from ___ to ________ with relatively constant nozzle pressure.

A constant 100 psi.
60 to 350 gpm

34

With nonadjustable nozzles, team may find the attack is stalled, or being driven back. Culprit is likely to be _____.

A kink

35

As a rule of thumb, if one person can control a ______ handline, the line isn't delivering it's designed flow.

1 3/4 or 2 in.

36

Fog nozzles cause _______ expansion of most foam solutions.
Air-aspirating nozzles typically create a ____________ expansion.

2:1 or 3:1

7:1 or even 10:1

37

CAFS produced in three ways:

Leaf blower on FF back.
Separate power supplies to run compressor.
Power takeoff-driven compressor

38

Device designed to allow stream application at 90 degree, similar to applicator.
Discharges solid stream.
Dumbwaiter shafts and cockloft fires (past).
Compactor chutes (present)

Bent TIP

39

Low pressure fog nozzle
Deliver its flows at _____ or ______.
2 reasons for low pressure fog

50 or 75 psi

Relieves nozzle team of fighting back pressure.
High rise when may not have 100 psi

40

Difficulties with cellar nozzles (2)

Area from which applied may be untenable.
Structural stability of floor itself

41

High Ex foam problems (2)

1) Sound is muffled, voices from within an SCBA face piece BARELY heard 3-4 ft.
2) Foam blanket breakdown (with fog) could result in steam burns

42

Applications for Piercing applicators

Hood/trunk (trunk through taillight housing).
Cockloft.
Baled materials

43

More than 250 gpm from floor below the fire

High-rise nozzle

44

After the nozzle operator has removed the working length, operator should step off _________ and then pause to allow the next member to remove folds of hose. Shorter preconnected lines (_______) should have _______ loop or fold. A ______ long preconnected should have _________ folds or loops.

Two to three paces

150-200 ft, some type of

300 ft long, 3 sets of folds or loops

45

If stretching hose to upper floors, backup person ___________. _______ is required to go from the ground to the fifth floor when using this method.

Keeps the hose in the well.
Only one length of hose

46

Elevator in place of stairwell
If no stairwell present, and if fire is on ___________, stretching hose around elevator becomes a very lengthy, tiring, and personnel-intensive process.

Fourth floor or higher

47

At least ____ members ascend the building when using s rope to haul the line up on the outside of the building.

2

48

In any multilevel building, except for the need to protect a SPECIFIC LIFE HAZARD, the main priority must be to position a hoseline to ___________. We accomplish three things:

Protect the interior staircases

Place hose between fire and occupants
CONFINE the fire

49

_______ will determine the location of the line placement at occupied buildings.

Life hazard

50

Exceptions to unburned side attack: (2)

Potential life hazard OR
Those that involve a means of egress

51

Max length of hose with friction loss:
1 1/2 in.?
1 3/4 in.?
2 in.?

4 for 125 gpm
6 for 150 gpm
6 for 190 gpm

52

Occupancy, area and size of fire determine?

Diameter of hose

53

Bldg height, area and setback determine?

Length

54

Solid stream.
90 degree angle.
Dumbwaiter and cockloft fires (past).
Compactor chutes (present).

Bent tip

55

Exposure: Most severe threat would be to __________

Window in opposite exposure directly in line with OR slightly HIGHER than it.