15 Questions
What is the ultimate goal of the driver in fire service hydraulics?
To provide the correct flow to the nozzle
What is the total pressure needed to overcome all friction, appliance, and elevation loss in fireground operations?
Pump discharge pressure
What is the pressure required at the nozzle for fog nozzles traditionally?
100 psi
What is nozzle reaction in fireground operations?
The opposing reaction that occurs as water is expelled from the nozzle
FL varies in direct proportion to what?
The length of the hose
What happens to FL when the flow is doubled?
FL is quadrupled
What is the pressure exerted by water per 1 ft of water column?
0.434 psi
At what rate does the pressure change for each floor of elevation in residential structures?
5 psi
What is the appliance loss for master streams with a flow of 350 gpm or more?
25 psi
When should the PDP not exceed 200 psi as a general rule?
Unless you know the system is designed to handle the pressure
What is the purpose of pressure reducing valves in standpipe risers?
To regulate pressure when static pressures exceed 175 psi
How are high rise buildings typically spaced in terms of elevation?
In 12-14 ft increments
What method is used to determine FL in 2.5" lines only flowing 160 gpm or greater?
Minus 10 method
What is the formula for FL in a 3.5" line according to the given information?
$FL = Q^2/3$
When should NFPA 14 require the installation of a device at the outlet to restrict or reduce the flow pressure?
When pressures while flowing exceed 100 psi
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