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10 Cards in this Set
- Front
- Back
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on the fire ground, the driver/operator uses commonly relies one or more of what methods to determine pressure loss and required pump discharge pressure?
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- Flowmeters
- Hydraulic calculators - Pump Charts - Hand method - Condensed "Q" method - GPM flowing |
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What NFPA standard allows flowmeters to be instead of pressure gauges on all discharges 1 1/2 - 3" in diameter?
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NFPA 1901
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Two basic types of flowmeters in the fire service?
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- Paddle wheel
- Spring probe |
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When flowmeters are calibrated and in good working condition they should be accurate to what tolerances?
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+/- 3%
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If a discharge is equipped with a flowmeter, it will have a digital readout how far from the control valve?
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6"
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When relay pumping with a flowmeter, you may increase the engine speed until what two things happen?
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- The flowmeter reading no longer increases along with the engine speed.
- The intake pressure drops below 20psi. |
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What are the two types of hydraulic calculators?
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- Manual
- Mechanical/electronic |
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Using the hand method for calculating friction loss for 2 1/2" hoselines, what figures are assigned to the spaces between the fingers?
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Half-Hundred figures
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The hand method for 1 3/4" line, what number is every finger multiplied by to calculate friction loss?
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12
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When flowing 170gpm or more through a 2 1/2" hoseline, what should you subtract from the first two numbers to calculate friction loss per 100' of line?
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10
ie. 170gpm = 17-10 = 7 |
