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HOT > Ch. 4 Hoseline Selection, Stretching And Placement > Flashcards

Ch. 4 Hoseline Selection, Stretching And Placement Flashcards

1
Q

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

A

Presence of Standpipes.
Open stairwells.
Usable courtyard windows

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2
Q

Two criteria to determine what size hoseline:

A

Required volume.

Reach/penetration

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3
Q

% of fire deaths that occur in residential buildings

A

75%

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4
Q

Gpm for 1 1/2”, 1 3/4”, and 2”

A

125, 180, 225

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5
Q

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

A

Over 75 feet

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6
Q

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

A

Strip mall or “taxpayer”, typically 20 x 75 feet

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7
Q

How much hose is enough?

Good rule of thumb is:

A

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

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8
Q

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

A

fire is in its final stages.

line strictly used for overhauling.

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9
Q

The job of the engine company: (4)

A

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

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10
Q

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

A

Either: floor below the fire OR

into a stairway window at midpoint between fire floor and floor below, then advanced to fire floor

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11
Q

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

A

3rd floor OR HIGHER before calling for water

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12
Q

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

A

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

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13
Q

Flow rates of __________ are available for handlines.

A

12-325 gpm

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13
Q

For operation of cellar nozzles: (4)

A

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)

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15
Q

3 characteristics of Cellar/Baker

A
  • 50 ft of reach
  • constantly manned
  • 1 or 2 directions

And a gate valve 50 ft back

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16
Q

3 characteristics of Bresnan distributor/revolving

A
  • 15-20 ft of reach
  • unmanned
  • Circular pattern spray
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17
Q

Bent APPLICATOR uses

A

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

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18
Q

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

A

Extremely expanded.

400:1 - 1,000:1

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19
Q

High-ex foam’s primary function is to:

A

Fill an enclosure

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20
Q

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

A

1 1/2 in.

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21
Q

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

A 
Need for speed.
Relatively low fire loading.
Presence of dividing walls/partitions.
-Reduce extent of involvement.
-Walls can be obstacles to hoseline advancement
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22
Q

Nozzle does several things: (3)

A

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

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23
Q

Asphalt siding aka

A

Gasoline siding

24
Q

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

EXCEPTION:

A

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

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

25
Q

Most versatile style of nozzle is ___________.

A

Variable-pattern, peripheral fog nozzle

26
Q

Break-apart nozzle advantages

A

Ensures rapid placement of tip.

Allows line to continue to operate while tip is brought

27
Q

Two main types of fog nozzles:

A

Constant-gallonage and constant-pressure

28
Q

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

A

That a change in stream position has on the flow

29
Q

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

A

Constant, stream position.

Gallonage

30
Q

Constant gallonage

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

A

Is 100 psi

31
Q

Constant gallonage nozzle

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

A

Manual setting

32
Q

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

A

Constant pressure or automatic nozzle

33
Q 
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

A constant 100 psi.

60 to 350 gpm

34
Q

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

A

A kink

35
Q

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

A

1 3/4 or 2 in.

36
Q

Fog nozzles cause _______ expansion of most foam solutions.

Air-aspirating nozzles typically create a ____________ expansion.

A

2: 1 or 3:1
7: 1 or even 10:1

37
Q

CAFS produced in three ways:

A

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

38
Q 
Device designed to allow stream application at 90 degree, similar to applicator.
Discharges solid stream.
Dumbwaiter shafts and cockloft fires (past).
Compactor chutes (present)
A

Bent TIP

39
Q

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

A

50 or 75 psi

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

40
Q

Difficulties with cellar nozzles (2)

A

Area from which applied may be untenable.

Structural stability of floor itself

41
Q

High Ex foam problems (2)

A

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
Q

Applications for Piercing applicators

A

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

43
Q

More than 250 gpm from floor below the fire

A

High-rise nozzle

44
Q

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.

A

Two to three paces

150-200 ft, some type of

300 ft long, 3 sets of folds or loops

45
Q

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

A

Keeps the hose in the well.

Only one length of hose

46
Q

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.

A

Fourth floor or higher

47
Q

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

A

2

48
Q

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:

A

Protect the interior staircases

Place hose between fire and occupants
CONFINE the fire

49
Q

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

A

Life hazard

50
Q

Exceptions to unburned side attack: (2)

A

Potential life hazard OR

Those that involve a means of egress

51
Q

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

A

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

52
Q

Occupancy, area and size of fire determine?

A

Diameter of hose

53
Q

Bldg height, area and setback determine?

A

Length

54
Q

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

A

Bent tip

55
Q

Exposure: Most severe threat would be to __________

A

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

HOT (22 decks)

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