Chapter 7 - Theoretical Pressure Calculations Activities Flashcards
Which of the following would be the first step when determining friction loss in Siamesed hoselines?
Compute the total gallons per minute (L/min) flowing.
page 216
What two things are necessary to calculate pump discharge pressure?
Nozzle pressure
total pressure loss
page 218
The primary consideration for friction loss is the:
volume of water flowing per minute.
page 210
total pressure loss is made up of the __________, __________ , and __________
Friction loss, elevation loss, and appliance loss
page 210
friction loss for handline nozzles is generally ___________
insignificant
page 213
Which method of determining friction loss involves the use of in-line gauges to measure friction loss at various flows through specific hose layouts?
Performing tests
page 211
Which method of determining friction loss relies on the use of mathematical equations or field application methods?
Using calculations
page 211
The use of standard formulas and field applications for determining friction loss are generally relied upon for:
safe fireground operations.
page 211
customary formula to determine elevation pressure in a multistory building?
5 psi × (number of stories - 1)
page 214
For which nozzle type is a pressure of 100 psi (700 kPa) a safe and efficient nozzle pressure?
Fog nozzle
page 219
metric formula for elevation pressure loss on the fireground?
10 × Height in meters
page 214
When a pumper is being supplied by another pumper, net pump discharge pressure is the difference between pump discharge pressure and:
incoming pressure from supply source.
page 219
for which nozzle is a pressure of 50 psi (350 kPa) a safe and efficient nozzle pressure?
Solid stream nozzle (handline)
page 219
for which nozzle is a pressure of 50 or 75 psi (350 or 525 kPa) a safe and efficient nozzle pressure?
Low pressure fog nozzle
page 219
The current formula for friction loss accounts for the:
diameter of the hose, the volume of water flowing, and the length of the hose layout.
page 212
What is the formula for friction loss?
FL= C(Q^2)L
page 212
Which is the correct formula for Net Pump Discharge Pressure?
Pump Discharge Pressure - Intake Reading
page 219
customary formula for elevation pressure loss calculations on the fireground?
0.5 × Height in feet
page 214
When two hoselines of equal length are Siamesed to supply a fire stream, friction loss is approximately:
25 percent less than that of a single hoseline at the same nozzle pressure.
page 216
In the formula for friction loss, the “L” refers to:
hose length.
page 212
when flowing 350 gpm (1 400 L/min) or greater there is a loss of ________ for each appliance, other than master stream devices.
10 psi (70 kPa)
page 213
Pressures for standpipe operations for fire departments may be labeled on ________ of the fire department connection.
the faceplate
page 216
When determining pressure loss for elevated waterways, the elevation of the master stream:
must be considered as part of the total pressure loss.
page 218
friction loss for master stream appliances
25 psi (175 kPa) for all appliances
page 213
For which nozzle is a pressure of 80 psi (560 kPa) a safe and efficient nozzle pressure?
Solid stream nozzle (master stream)
page 219
Which is the correct customary formula for determining pump discharge pressure?
Nozzle pressure plus total pressure loss
page 218
