6. Hose nozzles and flow rates Flashcards Preview

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Flashcards in 6. Hose nozzles and flow rates Deck (10)
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1

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The __ __ and size of the discharge or if this determines the flow and reach of a solid stream.

Nozzle pressure

2

Solid stream maximum

nozzles on headlines:

Master stream appliances:

50 psi

80 psi

3

Discharge rate

GPM=

29.7 x d^2 x NP squared

4

Fog nozzles

Nozzle pressure

100 psi

However some operate at 50 or 75 psi

5

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These nozzles are best suited for wildland fires and are not recommended for structural firefighting due to the low flow of only 8 to 15 gpm

High-pressure fog nozzle

6

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Generally, __ gpm is the maximum flow for a headline

350 gpm

7

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Master stream smoothbore nozzles generally operate it at __ psi , while fog appliances are generally operate it at __ psi.

80 psi

100 psi

8

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In most cases, solid stream nozzles for handline use operate at __ PSI nozzle pressure. Portable master stream devices should be operated at pressures not to exceed the manufacturers recommendation. Generally for fix master stream appliances a nozzle pressure of __ psi is required.

50

80

9

Nozzle reaction for solid stream nozzles

NR=

1.56 x d^2 x NP

10

Nozzle reaction for fog stream nozzles

NR=

0.0505 x Q x NP squared