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