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20 Cards in this Set
- Front
- Back
What are the four fundamental components of a water system?
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-Source of water supply
-Means of moving water -Water processing/treatment facilities -Water distribution system, incl. storage |
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What are the three methods of moving water in a system?
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-Direct pumping system
-Gravity system -Combination system |
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A fire hydrant that receives water from only one direction is a _______.
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Dead-end hydrant.
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A fire hydrant that receives water from two or more directions is a _______.
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Circulating feed or looped line.
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A distribution system that provides circulating feed from several mains constitutes a _______.
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Grid system.
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A grid system consists of what three components?
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-Primary feeders
-Secondary feeders -Distributors |
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Valves for water systems are broadly divided into what two types?
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Indicating and Nonindicating
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Name two common indicator valves:
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-Post Indicator Valv (PIV)
-Outside Screw & Yoke (OS&Y) |
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What are the four kinds of water pressure, and how is pressure measured?
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-Static pressure
-Normal operating pressure -Residual pressure -Flow pressure -Pressure = force per unit area |
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Define 'static pressure'.
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Non-flowing water. Potential energy available to force water through pipe, hose, etc. Also defined as normal pressure existing in system prior to flow hydrant being opened.
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Define 'normal operating pressure'.
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Pressure in a water system during periods of normal consumption demand (average of total amount used per day per anum).
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Define 'residual pressure'.
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Pressure left in a distribution system when flowing water, i.e., that part of the total available pressure not used to overcome friction/gravity.
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What are the two types of hydrants?
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-Dry-barrel
-Wet-barrel |
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Hydrant color codes: name the four colors and their corresponding GPM rates.
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-Light Blue: At least 1,500 gpm
-Green: 1,000-1,499 gpm -Orange: 500-999 gpm -Red: Less than 500 gpm |
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Define 'fire stream'.
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A stream of water or other extinguishing agent after it leaves a nozzle until it reaches the desired point.
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At 212 degrees (F), water expands how many times its original volume?
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1700
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Fire streams are classified into what three sizes?
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-Low-volume (<40 gpm)
-Handline (1.5-3inch hose, 40-350 gpm) -Master (>350 gpm) |
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What are the three patters of fire stream?
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-Solid
-Fog -Broken |
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What are the three ways in which foam extinguishes/prevents fire?
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-Separating (fuel and fire)
-Cooling (fuel and surfaces) -Suppressing (smothering - prevents release of flammable vapors) |
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Foam is especially effective on the two basic categories of flammable liquids, which are:
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-Hydrocarbon fuels
-Polar solvents |