6. Hose nozzles and flow rates

Question 1

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

Answer 1

Nozzle pressure

Question 2

Solid stream maximum

nozzles on headlines:

Master stream appliances:

Answer 2

50 psi

80 psi

Question 3

Discharge rate

GPM=

Answer 3

29.7 x d^2 x NP squared

Question 4

Fog nozzles

Nozzle pressure

Answer 4

100 psi

However some operate at 50 or 75 psi

Question 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

Answer 5

High-pressure fog nozzle

Question 6

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Generally, __ gpm is the maximum flow for a headline

Answer 6

350 gpm

Question 7

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

Answer 7

80 psi

100 psi

Question 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.

Answer 8

50

80

Question 9

Nozzle reaction for solid stream nozzles

NR=

Answer 9

1.56 x d^2 x NP

Question 10

Nozzle reaction for fog stream nozzles

NR=

Answer 10

0.0505 x Q x NP squared