Pump Ops Chpt 6 Flashcards Preview

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Flashcards in Pump Ops Chpt 6 Deck (34):
1

The fire service operates three types of nozzles to produce three basic fire streams: _____,_______, and _____.

Solid, fog, and broken steams

2

A ________ is produced with a fixed orifice and a smooth bore nozzle. The stream is tight with little spray or shower effect.

Solid fire stream

3

On handlines should generally be operated at a maximum of _____ nozzle pressure, while master stream appliances should be operated at a maximum______.

50 psi and 80 psi

4

GPM = 29.7 x D2 x NP

Gpm = discharge in gallons per minute

29.7 = a constant

D = diameter of orifice in inches

NP = nozzle pressure

5

A _________ may be produced by deflection at the periphery, by impinging jets of water, or a combination of these methods.

Fog stream

6

Periphery deflected streams are produced by deflecting water around an inside circular stem in the nozzle. The water is then deflected by the exterior barrel of the nozzle. The position of the stem relative to the barrel will determine the shape of the _______

Fog stream

7

Is designed to flow a specific volume of water on all stream patterns at a specific nozzle discharge pressure.

A constant flow nozzle

8

Most _______ are designed to operate at a nozzle pressure of 100 psi. However some nozzles may operate at 50 or 75 psi.

Constant flow nozzles

9

These nozzles allow the firefighter operating the handline to select the flow rate to suit fire and operating conditions.

Selectable gallonage nozzles

10

Are a type of variable flow nozzle with the ability to change patterns while maintaining the same nozzle pressure.

Automatic fog nozzle

11

Operating at a pressure of up to _____ high pressure fog nozzles produce a stream with significant forward velocity but relatively low volume of water delivery.

800 psi

12

These nozzles are best suited for wildland fires and are not recommend for structural fire fighting due to their low water flow of only _____ to ____ gpm

8 to 15 gpm 30L/min to 60L/min

13

Generally, _____ is the maximum flow for a handline

350 gpm

14

Are capable of water flow in excess of 350 gpm and must be properly secured to a safe position. These appliances may produce solid or fog streams and generate considerable nozzle reaction due to their higher flow rate.

Master stream nozzles

15

Are generally operated during incidents where handlines would be ineffective, conditions require a defensive posture, or personnel are limited.

Master stream appliances

16

Commonly called deck guns and permanently mounted on the apparatus

Fixed monitors

17

Maybe used in a mount on the apparatus or removed and used remotely from the vehicle.

Combination monitors

18

Stored on the apparatus for deployment to the location where they will be used.

Portable monitors

19

Are most often lowered through holes or other openings to the cellar of an occupancy. These devices may also be deployed for attic or other void space fires.

Cellar nozzles

20

Also called ________ are commonly used in aircraft firefighting, car fires, or to apply water to voids, attics, or their areas inaccessible to standard fire streams.

Piercing nozzles

21

The piercing nozzle is generally designed as _____ to _____ hollow steel rod ______ in diameter.

3 to 6 ft 1 1/2 inches in diameter

22

Designed to suppress fires in chimney flues, the_______ is supplied by a booster hose. The device consists of a solid piece of brass or steel with many small impinging holes. Flowing only ____ to _____ at a nozzle pressure of______psi the impinging holes of the _______ produce a very fine mist which turns to steam in the hot interior of the chimney.

Chimney nozzles

Flowing 1.5 to 3 GPM

100 psi

23

This _______ illustrates Newton's third law of motion: for every action there is an opposite equal reaction

Nozzle reaction

24

Nozzle reaction for solid stream nozzles

NR = 1.57 x D2 x NP

NR nozzle reaction in pounds

1.57 a constant

d nozzle diameter

NP nozzle pressure per square inch

25

A simple guideline for the customary system of measurement is ______ this may be used to achieve the approximate solid stream nozzle reaction on the fire ground.

NR = Q/3

26

Nozzle reaction for fog stream nozzles

NR = 0.0505 x Q x NP

NR nozzle reaction in pounds

0.0505 a constant

Q total flow through the nozzle in gallons per minute

NP nozzle pressure in pounds per square inch

27

A simple guideline for the customary system of the measurement is _______. This may be used to achieve the approximate for stream nozzle reaction on the fire ground.

NR= Q/2

28

Solid stream nozzles on handlines should generally be operated at a maximum of

50 psi

29

Although a narrow pattern is possible, impinging stream nozzles most often provide a

Wide angle fog pattern

30

When operating a _______, the driver operator sets its discharge gallonage with a specified range before use

Selectable gallonage nozzle

31

Adjust to fluctuating water flow to maintain effective pressure and a consistent fire stream in all flow ranges

Automatic nozzles

32

Smooth bore streams are generally operated at ____

80 psi master stream

33

While fog appliances are generally operated at

100 psi

34

As water is discharged from a nozzle at a given pressure, a counterforce pushes back against firefighters operating a hoseline. This force, called

Nozzle reaction