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16 Cards in this Set

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On the fire ground, the primary objective of the driver/operator is to do what?
Provide fire suppression crews with water in sufficient volume and at the pressure needed to achieve efficient fire control and/or extinguishment.
What is the primary determinant of friction loss?
The volume of water flowing per minute.
Factors that can cause friction loss?
- Hose condition
- Coupling condition
- Kinks
- Volume of water being flowed
Combined, friction loss and elevation pressure loss are referred to as what?
Total pressure loss
Coefficient of 1 3/4" w/ 1 1/2" couplings
15.5
Coefficient of 2 1/2" hose
2
Coefficient of 5" hose
0.08
Assumed friction loss for all master stream appliances?
25 psi
Assumed friction loss for appliances other than master streams?
10 psi
The pressure waters exerts per foot of elevation ?
0.434
Formula for calculating elevation loss or gain?
Elevation Pressure = 0.5 x height
When two hoselines of equal length are siamesed to supply a fire stream the friction loss is approximately what percentage of a single hoseline at the same nozzle pressure?
25%
When three hoselines of equal length are trimesed to supply a fire stream the friction loss is approximately what percentage of a single hoseline at the same nozzle pressure?
10%
Since master streams require large amounts of water, how are they generally supplied to reach these large volumes of water?
-multiple hoselines
-siamesed hoselines
-single LDH
In reference to friction loss, how are aerial devices with waterways treated?
The same as master stream devices using friction loss of 25psi with elevation being calculated separately.
Formula for pump discharge pressure.
PDP = NP + TPL