Ch. 4 Hoseline Selection, Stretching And Placement

Question 1

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

Answer 1

Presence of Standpipes.
Open stairwells.
Usable courtyard windows

Question 2

Two criteria to determine what size hoseline:

Answer 2

Required volume.

Reach/penetration

Question 3

% of fire deaths that occur in residential buildings

Answer 3

75%

Question 4

Gpm for 1 1/2”, 1 3/4”, and 2”

Answer 4

125, 180, 225

Question 5

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

Answer 5

Over 75 feet

Question 6

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

Answer 6

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

Question 7

How much hose is enough?

Good rule of thumb is:

Answer 7

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

Question 8

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

Answer 8

fire is in its final stages.

line strictly used for overhauling.

Question 9

The job of the engine company: (4)

Answer 9

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

Question 10

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

Answer 10

Either: floor below the fire OR

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

Question 11

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

Answer 11

3rd floor OR HIGHER before calling for water

Question 12

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

Answer 12

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

Question 13

Flow rates of __________ are available for handlines.

Answer 13

12-325 gpm

Question 13

For operation of cellar nozzles: (4)

Answer 13

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)

Question 15

3 characteristics of Cellar/Baker

Answer 15

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

And a gate valve 50 ft back

Question 16

3 characteristics of Bresnan distributor/revolving

Answer 16

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

Question 17

Bent APPLICATOR uses

Answer 17

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

Question 18

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

Answer 18

Extremely expanded.

400:1 - 1,000:1

Question 19

High-ex foam’s primary function is to:

Answer 19

Fill an enclosure

Question 20

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

Answer 20

1 1/2 in.

Question 21

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

Answer 21

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

Question 22

Nozzle does several things: (3)

Answer 22

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

Question 23

Asphalt siding aka

Answer 23

Gasoline siding

Question 24

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

EXCEPTION:

Answer 24

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

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

Question 25

Most versatile style of nozzle is ___________.

Answer 25

Variable-pattern, peripheral fog nozzle

Question 26

Break-apart nozzle advantages

Answer 26

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

Question 27

Two main types of fog nozzles:

Answer 27

Constant-gallonage and constant-pressure

Question 28

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

Answer 28

That a change in stream position has on the flow

Question 29

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

Answer 29

Constant, stream position. | Gallonage

Question 30

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

Answer 30

Is 100 psi

Question 31

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

Answer 31

Manual setting

Question 32

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

Answer 32

Constant pressure or automatic nozzle

Question 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. ```

Answer 33

A constant 100 psi. | 60 to 350 gpm

Question 34

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

Answer 34

A kink

Question 35

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

Answer 35

1 3/4 or 2 in.

Question 36

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

Answer 36

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

Question 37

CAFS produced in three ways:

Answer 37

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

Question 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) ```

Answer 38

Bent TIP

Question 39

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

Answer 39

50 or 75 psi Relieves nozzle team of fighting back pressure. High rise when may not have 100 psi

Question 40

Difficulties with cellar nozzles (2)

Answer 40

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

Question 41

High Ex foam problems (2)

Answer 41

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

Question 42

Applications for Piercing applicators

Answer 42

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

Question 43

More than 250 gpm from floor below the fire

Answer 43

High-rise nozzle

Question 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.

Answer 44

Two to three paces 150-200 ft, some type of 300 ft long, 3 sets of folds or loops

Question 45

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

Answer 45

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

Question 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.

Answer 46

Fourth floor or higher

Question 47

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

Answer 47

2

Question 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:

Answer 48

Protect the interior staircases Place hose between fire and occupants CONFINE the fire

Question 49

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

Answer 49

Life hazard

Question 50

Exceptions to unburned side attack: (2)

Answer 50

Potential life hazard OR | Those that involve a means of egress

Question 51

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

Answer 51

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

Question 52

Occupancy, area and size of fire determine?

Answer 52

Diameter of hose

Question 53

Bldg height, area and setback determine?

Answer 53

Length

Question 54

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

Answer 54

Bent tip

Question 55

Exposure: Most severe threat would be to __________

Answer 55

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