Hydraulics Manual Flashcards
A column of water 1 foot high exerts how much pressure at its base
.434 psi
A column of water 2.304 feet in height exerts a pressure of what at its base
1 psi
Nozzle pressure for Handline smoothbore nozzle’s is 50 psi but can be increased to what for higher flow
65 psi
nozzle pressure for Master streams with Smoothbore Nozzles is 80 psi but can be increased to want to achieve higher flow
100 psi
Define flow pressure
Pressure created by the velocity of water coming from a discharge opening
Define head pressure
Water pressure due to elevation
Define residual pressure
Pressure remaining in a water system when water is flowing
Define velocity
The speed at which water passes a given point
 What formula is used to determine the volume for a rectangular or square shaped container
L x W x D x 7.5 gallons/cubic foot
What is the formula to determine the volume of a cylinder pipe or hose in gallons
3.14 x r^2 x L x 7.5 gallons/cubic foot
What is the theoretical calculated flow of a 15/16 Smoothbore nozzle
185 gpm
What is the fireground calculation for flow of a 15/16 smoothbore nozzle
185 gpm
What is the theoretical calculation of flow for a 1 inch smoothbore nozzle
210 gpm
What is a Fire Ground calculation of flow for a 1 inch smoothbore nozzle
200 gpm
What is the theoretical calculation of flow for a 1 1/8 inch smoothbore nozzle
266 gpm
What is a Fire Ground calculation of flow for a 1 1/8 inch smoothbore nozzle
250 gpm
What is a Theoretical calculation of flow for a 1 1/4” smoothbore nozzle
328
what is the fireground calculation of flow for a 1 1/4” Smoothbore nozzle
325
What is the theoretical calculation of flow for 1 3/4” smoothbore nozzle
814
What is the fire ground calculation of flow for a 1 3/4” smoothbore nozzle at 80 psi
800
What is the range of flow for a 1 inch adjustable gallonage fog nozzle
12-60
What is the range in flow for the 2 1/2” Akron adjustable flow fog nozzle
125-250
What is the flow and pressure of a Decon shower
270 gpm
75 psi
What is the flow and pressure of a piercing nozzle
125 gpm
100 psi
What is the flow and pressure for a 2 1/2” distributor nozzle
250 gpm
100 psi
What is the flow and pressure for a 1 1/2” distributor nozzle
95 gpm
50 psi
What is the flow and pressure for a 2 1/2 inch seller nozzle
350 gpm
100 psi
What is the flow and pressure for a 11/2” cellar nozzle
160 gpm
100 psi
What nozzle pressure should be given to a fixed monitor smoothbore breakaway nozzle
110 psi
120 psi for 2” at 1000 gpm
What nozzle pressure shall be given to the combination monitor smoothbore nozzle which may be attached/ detached from the pumper
80 psi
What is the coefficient for 1” hose
150
What is the rating of a national foam JS 10 air aspirating nozzle
100 gpm at 100 psi
variable spray or straight stream
Can be used with all low expansion foam concentrates
In a relay the maximum amount of water being delivered to the fire scene is limited by what two factors
Water source
pump capacity of smallest pumper and relay
What is the maximum flow from a side intake
1750 gpm
What is the maximum flow of a rear intake
1500-1750 gpm
What is the maximum flow of a front intake
900 gpm
Anytime incoming pressure from a water source exceeds ——- psi the pump shall be operated in pump gear to avoid damage to the pump gears and auto lube system
50 psi
how does A Pressure Governor compensate for overpressure under pressure on the discharge side of the pump
By increasing or decreasing the engine rpm is necessary to maintain the set pump discharge pressure
If water supplies lost the driver operator must do what ?
Open tank to pump valve utilizing tank water the notify interior crew in command they’re operating off tank water
coefficient for dual 3” hose with 2.5” coupling
.2
coefficient for dual 4” hose
.05
coefficient for 1-4” & 1-3”
.09
weight cubic foot of water
62.5 lbs
remember when calculating EP for buildings, multiply by 4.34 NOT .434
remember when calculating EP for buildings, multiply by 4.34 NOT .434
