Hydraulics Manual Flashcards
How far from the pump panel can the Portable Foam Educator be placed? How far from the nozzle?
50’ from the pump panel. 200’ from the nozzle
The Akron assault nozzle carries a nozzle pressure of? Flows?
50psi, Flows 175gpm(Fog) 185gpm 15/16 slug
The Akron Mercury Quick-Attack Monitor with a smooth bore 1”3/8 tip requires a nozzle pressure of
80psi
Permanently mounted monitors in Fairfax County flow between 500-1,000gpm. List the following tip sizes final discharge pressures.
a. 2”
b. 1”3/4
c. 1”1/2
d. 1”3/8
a. 2” = 120
b. 1”3/4 = 110
c. 1”1/2 = 110
d. 1”3/8 = 110
Fairfax County typically utilizes what type of pumps on its engine companies?
Single Stage, Centrifugal Pump
What is the starting pressure for sprinkler systems in Fairfax County?
150psi
What is the starting pressure for a combination fire protection system in Fairfax County?
150psi
The Fairfax County blitz line flows how much (fire ground and actual) with the 1”1/8 tip? With the 1’1/4 tip
1”1/8 tip =250/266gpm , 1’1/4 tip = 325/328gpm
Master stream fog nozzles have a max gpm of?
1,250gpm
Fairfax County piercing/penetrating nozzles flow? At what pressure?
125gpm @ 100psi
The Akron assault nozzle when broken down to the slug is what size? Flows?
15/16in. flows 185gpm
What is the standing order in Fairfax County for starting pressure when charging a stand pipe?
150psi
What is your standing order for 3” supply operations in regards to starting pressure in Fairfax County?
100psi
A swimming pool that measures 8ft. long 7ft. wide and 10ft. deep has a volume of?
4200gal
Smooth bore hand lines carry a nozzle pressure of?
50psi
100’ section of 4” supply line holds how much water?
62.5 gallons
List the appliance loss for the following appliances
a. Small appliance flowing greater than 350gpm
b. Ladder Pipe
c. Master streams (excluding Mercury Monitor)
d. Stand Pipes
a. Small appliance flowing greater than 350gpm = 10psi
b. Ladder Pipe = 25psi
c. Master streams = 25psi
d. Stand Pipes = 25psi
The Akron Mercury Quick-Attack Monitor with a fog nozzle requires a nozzle pressure of?
100psi
When should sprinkler systems be charged upon arrival on scene in Fairfax County?
Smoke or fire showing or reports from interior crews
Booster reel lines are typically what diameter? Carry a nozzle pressure of? What is the gpm?
1’’ / 100psi / 12 to 60
What is the like volumes and percentages associated with each?
0-10%–3 like volumes
11-15%–2 like volumes
16-25%–1 like volume
>25%–no like volume
A hose line flowing 200gpm has a friction loss of 30psi. If the same line begins flowing 400gpm the friction loss for the hose line would be?
120psi
What is the formula for calculating friction loss?
FL = CQ2L
Fairfax County cellar nozzles come in 2 sizes. What are they? Flow? Psi?
2 1/2” 350gpm @100psi
1 1/2” 160gpm @100psi
The Akron Quick-Attack Mercury Monitor flows?
500gpm
What is the formula for volume in a cylinder?
Pi x r2 x L(or H) x 7.5
An unknown diameter hose that is 100ft long has a friction loss of 40psi. All things being equal if you added another 100ft. of identical hose the friction loss would be?
80psi
What is the minimum supply requirements (hose) when supplying an aerial device in Fairfax County?
1 LDH(4”) or 2 3” lines
When operating a flowing master stream aerial ladders can be retracted while the water way is closed.
False
What is the preferred nozzle tip/nozzle choice while flowing foam from a CAFs unit?
15/16” smooth bore slug
What is the Total Pressure Loss (TPL) formula?
TPL = FL + AL +/- EL
Fairfax County distributor nozzles come in 2 sizes. What are they? Flow? Psi?
2 1/2” = 250gpm @ 100psi
1 1/2” = 95gpm @ 50psi
Smooth bore master streams carry a nozzle pressure of?
80psi
In Fairfax County you may supply the Mercury Quick-Attack Monitor w a 4” supply line
False
What is the starting pressure for all aerial devices in Fairfax County?
150psi
What is the pressure exerted by a 1 foot high column of water?
.434psi
The Mercury Quick-Attack Monitor flows 500gpm from either the smooth bore or fog nozzle?
True
What is the formula for smooth bore nozzle discharge?
29.7 x d2 x square root of the nozzle pressure
While pumping an “Around the Pump” system and being supplied by another pumper what should intake pressure be limited to?
10psi
What is the elevation loss for a fire on the 7th floor of a high rise building
30psi
What is the max safe PDP in Fairfax County?
250psi
What are the CAFs unites in Fairfax County
412, 416, 420 and 441
What is Fairfax County’s foam nozzle? What does it flow? Nozzle pressure?
JS-10 flows 100gpm @ 100psi
A 50ft. section of 1”3/4 hose line holds how much water?
6.24
The appliance loss for the Akron Mercury Quick-Attack Monitor is?
10psi
What is the minimum amount of foam a Fairfax County Engine must carry?
40 gal
How much does one gallon of water weigh?
8.33lbs
What is your standing order for 4” supply operations in regards to starting pressure in Fairfax County?
50psi
Any time the intake pressure exceeds ___psi, the pump shall be placed in gear.
50
List the flows (fire ground) for the following Fairfax County smooth bore master stream nozzles:
a. 2”
b. 1”3/4
c. 1”1/2
d. 1”3/8
e. 1”1/4
a. 2” = 1,000gpm
b. 1”3/4 = 800gpm
c. 1”1/2 = 600gpm
d. 1”3/8 = 500gpm
e. 1”1/4 = 400gpm
While using Fairfax County’s Portable Foam Educator what is the desired pressure at the induction side of the educator?
200psi @ the rear of the educator
CAFs hose lines must be kept shut at all times while not flow.
False
The decon showers used by Fairfax County on hazmat incidents flow? At what pressure?
270gpm @ 75psi
