Chapter 6 Hose Nozzles And Flow Rates Flashcards Preview

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Flashcards in Chapter 6 Hose Nozzles And Flow Rates Deck (31):
1

What affects the condition of the stream as it leaves the nozzle:

Operating pressure nozzle design and adjustment, condition of the nozzle as well

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2

Until it reaches its destination the fire stream is influnced by:

Velocity, gravity, wind, and friction with the air
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3

The fire service operates 3 types of nozzles to produce three basic fire streams, they are:

Solid, fog, and broken
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4

A solid stream is produced with a:

Fixed orifice and a smooth bore nozzle
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5

The flow and reach of a solid stream is determined by:

The pressure and size of the discharge orifice
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6

Solid stream nozzles should be operated at.....psi and master stream appliances should be operated at..... Psi

50/80
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7

Gpm formula is:

29.7 X d2 x sqroot of NP
D2 = diameter of the orifice in inches
Np is nozzle pressure in psi
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8

On fog nozzles a wide angle deflection produces:
A narrow angle deflection produces:

Wide fog pattern produced by wide deflection
Narrow fog pattern produced by a narrow deflection
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9

A fog stream may be produced by deflection at the:

Periphery, by impinging jets of water, or a combination of these
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10

The position of the stem relative to the barrel will determine the:

Shape of the fog stream
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11

Impinging stream nozzles most often provide a:

Wide angle fog pattern
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12

THe reach of the fog stream is directly related to it:

Width, the size of the water particles, the wind, and the volume of water flowing
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13

A constant flow nozzle is designed to flow:

A specific volume of water on all stream patterns at a specific nozzle discharge pressure
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14

Most constant flow nozzles are designed to operat at a nozzle pressure of..... Psi however some nozzles may operate at..... Psi

100/50
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15

Selectable gallonage nozzles allow the firefighters operating the handline to select the:

Flow rate to suit fire and operating conditions
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16

Selectable gallonage nozzles are designed to flow the gallonage indicated at..... Psi nozzle pressure

100
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17

Automatic nozzles are a type of variable flow nozzle with the ability to:

Change patterns while maintaining the same nozzle pressure
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18

High pressure fog nozzles operate a pressures up to.... Psi and deliver a significant forward velocity but relatively low:

800 psi
Low water volume
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19

High pressure fog nozzles are best suited for....... Firefighting and only operate at... To .... Gpm

Wildland firefighting and operate at 8/15 gpm
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20

Nozzles for use on handlines may be .... Or ..... Or ...... Design ranging in size from 3.4 inch to a 3 inch diameter hose nozzle. Generally .... Gpm is maximum flow for a handline

Solid, fog or broken stream
350 gpm
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21

Generally ..... Gpm is the maximum flow for a handline:

350
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22

Master stream nozles are capable of water flow in excess of 350 gpm and must be properly..... For safe operation:

Secured

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23

Master stream appliances are generally operated during incidents where handlines would be:

Ineffective, conditions require a defensive posture, or personnel are limited.

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24

Smooth bore streams are generally operated at .... Psi nozzle pressure while fog appliances are generally operated at.... Psi

80/100

25

The three basic types of master streams appliances are:

Fixed, combination, portable:
Fixed- deck guns permantely mounted to the apparatus
Combination-can be used on a off the vehicle
Portable- stored on apparatus and removed to use on scene

26

Cellar nozzles are also referred to as:

Distributors

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27

Piercing nozzles also called_________ are commonly used in:

Penetrating nozzles are used in aircraft fire fighting, car fires, or to apply water to voids, attics, or other areas inaccessible to standard fire streams
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28

Chimney nozzles flow only________ gpm at 100 psi

1.5-3 gpm

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29

Nozzle reaction:

The counterforce pushing back against firefighters operating the hoseline as water is discharging

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30

Nozzle reaction formula:

NR=1.57 x d2 x np
D= nozzle diameter in inches
Np = nozzle pressure in psi

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31

Nozzle reaction for fog stream nozzles formula:

NR= 0.0505 x q x sqroot NP

Q= total flow through the nozzle in gpm
Np = nozzle pressure in psi
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