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.