Flashcards in Ch. 4 Hoseline Selection, Stretching And Placement Deck (55):
Method of stretch determined by such factors as: (3)
Presence of Standpipes.
Usable courtyard windows
Two criteria to determine what size hoseline:
% of fire deaths that occur in residential buildings
Gpm for 1 1/2", 1 3/4", and 2"
125, 180, 225
When relating to reach of fire streams, Large-area buildings are _______ in width or depth.
Over 75 feet
Very common structure across US is one-story commercial building of ordinary construction called:
Strip mall or "taxpayer", typically 20 x 75 feet
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.
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.
The job of the engine company: (4)
Putting PROPER size line at REQUIRED place in LEAST possible time with most EFFICIENT use of personnel
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
For fires above grade/ground, you can stretch a dry line:
3rd floor OR HIGHER before calling for water
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
Flow rates of __________ are available for handlines.
For operation of cellar nozzles: (4)
Only darkens, doesn't put out.
10 in x 10 in hole needed.
Have to hook up to 2 1/2 in. (Not preconnected)
3 characteristics of Cellar/Baker
-50 ft of reach
-1 or 2 directions
And a gate valve 50 ft back
3 characteristics of Bresnan distributor/revolving
-15-20 ft of reach
-Circular pattern spray
Bent APPLICATOR uses
AFFF (class B).
Dry-chem (small fires-remove fog tip).
Water (airbags under vehicles)
High-expansion foam is _________ solution of water and DETERGENT:
Ratio of _____ - ______
400:1 - 1,000:1
High-ex foam's primary function is to:
Fill an enclosure
Residential occupancy at flashover stage, a hoseline of at least _____ diameter is required
1 1/2 in.
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
Nozzle does several things: (3)
REGULATES flow (ball valve).
Gives stream its SHAPE
Asphalt siding aka
As a rule of thumb, no nozzle should have an opening greater than _____________.
Half the diameter of its supply. Fog as well as solid tips
Stretch is kept short and discharge pressure is raised SUFFICIENTLY high.
Most versatile style of nozzle is ___________.
Variable-pattern, peripheral fog nozzle
Break-apart nozzle advantages
Ensures rapid placement of tip.
Allows line to continue to operate while tip is brought
Two main types of fog nozzles:
Constant-gallonage and constant-pressure
Constant-gallonage is a misnomer. It refers to the effect _____________
That a change in stream position has on the flow
A _____ amount of water flows out of the opening regardless of ____________. ______ is constant as long as nozzle pressure remains constant.
Constant, stream position.
Usually designed to deliver a specified gallonage when the nozzle pressure _________.
Is 100 psi
Constant gallonage nozzle
Good idea always to ensure that when beginning operations, the _________ is at the nozzles maximum flow.
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
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
With nonadjustable nozzles, team may find the attack is stalled, or being driven back. Culprit is likely to be _____.
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.
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
CAFS produced in three ways:
Leaf blower on FF back.
Separate power supplies to run compressor.
Power takeoff-driven compressor
Device designed to allow stream application at 90 degree, similar to applicator.
Discharges solid stream.
Dumbwaiter shafts and cockloft fires (past).
Compactor chutes (present)
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
Difficulties with cellar nozzles (2)
Area from which applied may be untenable.
Structural stability of floor itself
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
Applications for Piercing applicators
Hood/trunk (trunk through taillight housing).
More than 250 gpm from floor below the fire
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
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
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
At least ____ members ascend the building when using s rope to haul the line up on the outside of the building.
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
_______ will determine the location of the line placement at occupied buildings.
Exceptions to unburned side attack: (2)
Potential life hazard OR
Those that involve a means of egress
Max length of hose with friction loss:
1 1/2 in.?
1 3/4 in.?
4 for 125 gpm
6 for 150 gpm
6 for 190 gpm
Occupancy, area and size of fire determine?
Diameter of hose
Bldg height, area and setback determine?
90 degree angle.
Dumbwaiter and cockloft fires (past).
Compactor chutes (present).