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Pumping Apparatus > Chapter 6 Hose Nozzles And Flow Rates > Flashcards

Chapter 6 Hose Nozzles And Flow Rates Flashcards

1
Q

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

A

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

Pg 193

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2
Q

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

A

Velocity, gravity, wind, and friction with the air

Pg193

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3
Q

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

A

Solid, fog, and broken

Pg 193

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4
Q

A solid stream is produced with a:

A

Fixed orifice and a smooth bore nozzle

Pg 194

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5
Q

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

A

The pressure and size of the discharge orifice

Pg 194

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6
Q

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

A

50/80

Pg 194

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7
Q

Gpm formula is:

A

29.7 X d2 x sqroot of NP
D2 = diameter of the orifice in inches
Np is nozzle pressure in psi
Pg 195

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8
Q

On fog nozzles a wide angle deflection produces:

A narrow angle deflection produces:

A

Wide fog pattern produced by wide deflection
Narrow fog pattern produced by a narrow deflection
Pg195

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9
Q

A fog stream may be produced by deflection at the:

A

Periphery, by impinging jets of water, or a combination of these
Pg 198

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10
Q

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

A

Shape of the fog stream

Pg196

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11
Q

Impinging stream nozzles most often provide a:

A

Wide angle fog pattern

Pg196

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12
Q

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

A

Width, the size of the water particles, the wind, and the volume of water flowing
Pg197

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13
Q

A constant flow nozzle is designed to flow:

A

A specific volume of water on all stream patterns at a specific nozzle discharge pressure
Pg197

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14
Q

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

A

100/50

Pg 197

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15
Q

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

A

Flow rate to suit fire and operating conditions

Pg 197

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16
Q

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

A

100

Pg 198

17
Q

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

A

Change patterns while maintaining the same nozzle pressure

Pg 198

18
Q

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

A

800 psi
Low water volume
Pg 199

19
Q

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

A

Wildland firefighting and operate at 8/15 gpm

Pg 199

20
Q

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

A

Solid, fog or broken stream
350 gpm
Pg 199

21
Q

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

A

350

Pg 199

22
Q

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

A

Secured

Pg 199

23
Q

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

A

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

Pg 199

24
Q

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

A

80/100

25
Q

The three basic types of master streams appliances are:

A

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
Q

Cellar nozzles are also referred to as:

A

Distributors

Pg 200

27
Q

Piercing nozzles also called_________ are commonly used in:

A

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
Pg 201

28
Q

Chimney nozzles flow only________ gpm at 100 psi

A

1.5-3 gpm

Pg 201

29
Q

Nozzle reaction:

A

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

Pg 202

30
Q

Nozzle reaction formula:

A

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

Pg 203

31
Q

Nozzle reaction for fog stream nozzles formula:

A

NR= 0.0505 x q x sqroot NP

Q= total flow through the nozzle in gpm
Np = nozzle pressure in psi
Pg 204

Pumping Apparatus (12 decks)

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