# Chapter 6 - Hoze Nozzles and Flow Rates Flashcards Preview

## IFSTA Pumping and Aerial Apparatus Driver/Operator Handbook - 3rd Edition > Chapter 6 - Hoze Nozzles and Flow Rates > Flashcards

Flashcards in Chapter 6 - Hoze Nozzles and Flow Rates Deck (12)
1
Q

__________, ________ and _______, as well as ___________ affect the condition of the stream as it leaves the nozzle.

A

Operating Pressure
Condition of the Nozzle Orifice

2
Q

The fire service operates three types of nozzle to produce three basic fire streams:

A

Solid, Fog, and Broke Stream

3
Q

A _________ is produced with a fixed orifice and a smooth bore nozzle.

A

Solid Fire stream

4
Q

Solid stream nozzles on handlines should generally be operated at a maximum of ___ psi nozzle pressure, while master stream appliances should be operated at a maximum ___ psi.

A

50 psi

80 psi

5
Q

Formula to determine the flow of a solid stream nozzle.

A

GPM = 29.7 x d² x √NP

6
Q

The reach of the fog stream is directly related to _______, __________, _____, and __________.

A

Its width
The size of the water droplets
The wind
The volume of water flowing

7
Q

Most constant flow nozzles are designed to operate at a nozzle pressure of ___ psi. However, some nozzles may operate at __ or __ psi.

A

100 psi

50 or 75 psi.

8
Q

The three basic types of master stream appliances are _____, _______, and _______.

A

Fixed
Combination
Portable

9
Q

________ are most often lowered through holes or other openings to the cellar of an occupancy.

A

Cellar Nozzle (distributors)

10
Q

_________ are commonly used in aircraft firefighting, car fires, or to apply water to voids, attics, or other areas inaccessible to standard fire streams.

A

Piercing nozzles (Penetrating nozzle)

11
Q

Formula to determine nozzle reaction for solid stream nozzles.

A

NR = 1.57 x d² x NP
simply
NR = Q/3
Q = total flow through the nozzle in gpm.

12
Q

Formula to determine nozzle reaction for fog nozzles.

A

NR = 0.0505 x Q x √NP
simply
NR = Q/2
Q = total flow through the nozzle in gpm.