Chapter 11 Flashcards
is an underground water storage receptacle usually found in an area not serviced by a hydrant system?
Cistern
Most likely to make it necessary to position portable pumps at the supply source during drafting operations?
When fire apparatus cannot make required approach
When drafting, water is forced in and continues to rise until the pump is full of water or:
pressure within the pump and intake hose equals atmospheric pressure.
When evaluating adequacy of smaller natural sources, why should caution be used regarding their suitability as a water supply for fire fighting?
They may be more susceptible to fluctuations in adequacy during periods of drought than larger bodies of water.
Which of the following is MOST likely to impede access to a natural static water source?
Wet/soft ground approaches
Which of the following generally supply water via open canals and portable pipes?
Agricultural irrigation systems
Lift can be described as the difference in elevation between the surface of the static water supply and the:
center of the pump intake.
Which of the following statements about theoretical lift is MOST accurate?
Maximum lift at a given altitude will be less than theoretical lift.
As the point of maximum lift is approached, the volume of water available for the fire pump
may be too low to be of value in fire suppression.
floating strainers may be used for water as shallow as:
1 foot
When at draft, the sum of the pump discharge pressure and intake pressure correction that takes into account friction loss in the intake hose and height of the lift is called:
net pump discharge pressure.
What water depth is generally considered minimum around a barrel-type strainer?
2 feet
The height that a column of water may be lifted in sufficient quantity to provide a reliable fire flow is called:
dependable lift.
What do some jurisdictions do to help avoid problems with silt and debris?
Install dry hydrants at favorable drafting locations
All firefighters working in close proximity to bodies of water must wear personal flotation devices and use safety lines
regardless of the assumed depth.
In most circumstances, maximum lift is approximately:
25 feet
Which of the following may be equipped with connections similar to a dry hydrant for quick fire department hook-ups?
Large indoor or outdoor pools
Any operation that causes salt or dirty water to be drawn into a pump requires the pump be flushed with:
clean fresh water after pumping operation is complete
The water supply in a typical residential swimming pool:
may contain adequate water supply for a fire in a single family dwelling
During the process of drafting, which of the following results in water being forced into the hose and pump because of a partial vacuum created in the pump?
Pressure in the intake hose and pump drops to lower than atmospheric pressure.
Low-level strainers are most commonly used to draft from
portable water tanks.
typically contains many millions of gallons (liters) of water and may be found on large commercial or industrial properties?
Ground reservoir
is the fire department MOST likely to require the owner to equip with appropriate connection points for fire department use?
Private water storage tank
would be the MOST likely concern after traversing frozen ground in order to reach a drafting site?
Thawing may occur from an increase in air temperature.
When should driver/operators become familiar with drafting sources within their jurisdiction?
Preincident planning
When drafting as lift or friction loss in hard intake hose is increased, water supply capability of the pump:
decreases
Theoretical lift can be calculated by determining the actual atmospheric pressure of an area and:
multiplying that number by the water’s pressure per square foot (kPa) while it is in the intake hose.
After factoring in surrounding atmospheric pressure and friction loss in the intake hose, every fire pump operating properly should have a dependable lift of:
at least 14.7 feet
likely to require specially threaded adapters or other tools to operate the system?
Agricultural irrigation systems
likely to have access that may be difficult because of their backyard location and the presence of fences?
Swimming Pools
