Broken Stream
Give this one a try later!
Produced by forcing water through a series of small holes, making droplets
for quick heat absorption
Better reach than a fog stream
, Typically produced by special purpose nozzles; there included cellar, water
curtains, piercing, and chimney nozzles.
Challenge Review 10
To determine the nozzle reaction for a given solid stream nozzle, the elements that you
will need to complete the process:
Give this one a try later!
A. Hose length and GPM
B. Nozzle diameter and nozzle pressure - Correct Answer
C. Constant nozzle pressure and hose length
D. Nozzle flow rate and nozzle diameter
Knowledge Check 1
1. Most extinguishing agents require less than one BTU to raise their temperature 1° F.
2. This is the heat absorbing capacity of a substance.
3. Water absorbs over 950 additional BTUs going from 212° F to steam.
4. This is the amount of heat needed to turn a liquid into a vapor.
Give this one a try later!
, Law of specific Heat
1&2
Law of Latent Heat of Vaporization
3&4
Steps for Master Stream Layouts
Give this one a try later!
1. Establish Q(total) (Total GPM flow/100) for the required nozzle. For solid
streams nozzles you'll need to compute Q(total) based on nozzle diameter
(d) and nozzle pressure (NP). Q(Total) = 29.7 x (d)² x (√NP) / 100
2. Determine the friction loss in the supply line or lines using the techniques
you've learned throughout this topic. Remember the equation: FL = C x Q² x L
If the supply lines are of unequal length, take the average of the lengths and
use this value for "L"
3. Determine the friction loss for the master stream device (25 psi, no matter
what the flow is)
APL(master stream device) = 25 psi
4. Add the friction loss from the supply line or lines, elevation pressure (if
applicable), and 25 psi for the master stream device (if additional appliances
are used, include 10 psi for each):
TPL = FL(supply) + EP + APL(master stream device) + APL(other appliances)
5. Determine pump discharge pressure by adding the nozzle pressure to the
total pressure loss:
PDP = NP + TPL
, Example
Your Crew is fighting a fire on the top floor of a three-story building located at the top of
a 20-foot hill. The fire is located in the hallway; your crew is fighting this with a 600-foot
hoseline composed of 400 feet of 3-inch hose reduced to 200 feet of 1 ½ inch hose with
a 100 GPM fog nozzle.
Give this one a try later!
FL for 400 feet of 3-inch hose flowing 100 GPM
FL = C x (Q/100)² x (L/100)
FL = 0.8 x (100/100)² x (400/100)
FL = 0.8 x (1)² x 4
FL = 0.8 x 1 x 4
Fl = 3.2 psi Loss
FL for 200 feet of 1 ½ inch hose flowing 100 GPM
FL = C x (Q/100)² x (L/100)
FL = 24 x (100/100)² x (200/100)
FL = 24 x (1)² x 2
FL = 24 x 1 x 2
FL = 48 psi Loss
FL = 3.2 + 48
FL = 51.2
EP for 20-foot Hill
EP = 0.5 x H
EP = 0.5 x 20
EP = 10
EP for 3rd floor
EP = 5 x (FL - 1)
EP = 5 x (3 - 1)
EP = 5 x 2
EP = 10
Give this one a try later!
Produced by forcing water through a series of small holes, making droplets
for quick heat absorption
Better reach than a fog stream
, Typically produced by special purpose nozzles; there included cellar, water
curtains, piercing, and chimney nozzles.
Challenge Review 10
To determine the nozzle reaction for a given solid stream nozzle, the elements that you
will need to complete the process:
Give this one a try later!
A. Hose length and GPM
B. Nozzle diameter and nozzle pressure - Correct Answer
C. Constant nozzle pressure and hose length
D. Nozzle flow rate and nozzle diameter
Knowledge Check 1
1. Most extinguishing agents require less than one BTU to raise their temperature 1° F.
2. This is the heat absorbing capacity of a substance.
3. Water absorbs over 950 additional BTUs going from 212° F to steam.
4. This is the amount of heat needed to turn a liquid into a vapor.
Give this one a try later!
, Law of specific Heat
1&2
Law of Latent Heat of Vaporization
3&4
Steps for Master Stream Layouts
Give this one a try later!
1. Establish Q(total) (Total GPM flow/100) for the required nozzle. For solid
streams nozzles you'll need to compute Q(total) based on nozzle diameter
(d) and nozzle pressure (NP). Q(Total) = 29.7 x (d)² x (√NP) / 100
2. Determine the friction loss in the supply line or lines using the techniques
you've learned throughout this topic. Remember the equation: FL = C x Q² x L
If the supply lines are of unequal length, take the average of the lengths and
use this value for "L"
3. Determine the friction loss for the master stream device (25 psi, no matter
what the flow is)
APL(master stream device) = 25 psi
4. Add the friction loss from the supply line or lines, elevation pressure (if
applicable), and 25 psi for the master stream device (if additional appliances
are used, include 10 psi for each):
TPL = FL(supply) + EP + APL(master stream device) + APL(other appliances)
5. Determine pump discharge pressure by adding the nozzle pressure to the
total pressure loss:
PDP = NP + TPL
, Example
Your Crew is fighting a fire on the top floor of a three-story building located at the top of
a 20-foot hill. The fire is located in the hallway; your crew is fighting this with a 600-foot
hoseline composed of 400 feet of 3-inch hose reduced to 200 feet of 1 ½ inch hose with
a 100 GPM fog nozzle.
Give this one a try later!
FL for 400 feet of 3-inch hose flowing 100 GPM
FL = C x (Q/100)² x (L/100)
FL = 0.8 x (100/100)² x (400/100)
FL = 0.8 x (1)² x 4
FL = 0.8 x 1 x 4
Fl = 3.2 psi Loss
FL for 200 feet of 1 ½ inch hose flowing 100 GPM
FL = C x (Q/100)² x (L/100)
FL = 24 x (100/100)² x (200/100)
FL = 24 x (1)² x 2
FL = 24 x 1 x 2
FL = 48 psi Loss
FL = 3.2 + 48
FL = 51.2
EP for 20-foot Hill
EP = 0.5 x H
EP = 0.5 x 20
EP = 10
EP for 3rd floor
EP = 5 x (FL - 1)
EP = 5 x (3 - 1)
EP = 5 x 2
EP = 10
