Pump 12 Flashcards
The process of raising water from a static source to supply a pumper is known as ($$$$$)
Drafting
In the customary system of measurement, at sea level a pump could theoretically lift water ($$$$$)
33.8 feet
For every 1000ft atmospheric pressure decreases about ($$$)
0.5 psi
Fire department pumpers cannot be expected to draft water that is located ($$$$$) below the level of the pump.
33.8 feet
In fire service terms, )$$$$) is defined as the maximum height to which any amount of water maybe raised through a hard intake hose through the pump. In most circumstances maximum lift is no more than ($$$)
Maximum lift
25 feet
To detriment the maximum lift that a pumper can achieve in the customary system of measurement, the vacuum reading in inches of mercury at the intake gauge is read and multiplied using the following formula
L=1.13(Hg)
($$$$) is the height a column of water may lifted in sufficient quantity to provide a reliable fire flow.
Dependable lift
Every pump in good repair should have a dependable lift of at least ($$$$$)
14.7 feet
All fire department apparatus have their fire pump rated when drafting from a lift of ($$$$$$) through ($$$$) of hard intake hoe.
10feet
20 feet
The pump is only able to deliver ($$$$) of its capacity at 15 feet lift and ($$$$) at 20 feet lift.
70%
60%
Pressure correction
(Lift + total intake hose friction loss)/2.3
Net pump discharge pressure
NPDP=PDP + intake pressure correction
Natural static water supply sources include
Lakes Pounds Streams Rivers Oceans
The adequacy of a small stream may be evaluated using the following formula
Q= A x V x 7.5
A preferable method for avoiding silt and debris is by the instillation of a ($$$$$)
Dry hydrant
