Hydraulics Flashcards
Appliance loss in a ladder pipe
25 psi
Cubic foot of water weight
62.5 lbs
“Fireground” master steam flows
1 1/4: 1 3/8: 1 1/2 1 3/4 2
400 500 600 800 1000
Gallons in a cubic foot
7.5 gallons
Fairfax county engines carry how much foam?
40 gallons class B
How many feet from the pump must foam eductor be placed?
50 ft
How many feet from nozzle must eductor be placed?
Within 200 ft
One cubic foot contains how many cubic inches?
1728 cubic inches
One cubic foot contains how many gallons?
7.5
One cubic foot of fresh water weighs how many pounds?
62.5 pounds
One gallon contains how many cubic inches?
231 cubic inches
One gallon of fresh water weighs how many pounds?
8.33 pounds
One column of 1’ high exerts a pressure of what at its base?
.434 psi
A column of 2.304’ high exerts how much pressure at its base?
1 psi ( 1/.434)
50’ of 1.75 hose contains how many gallons?
6.24
50’ length of 1.88” hose contains how many gallons?
7.2
50’ of 2.5” contains how many gallons?
12.74
50’ of 3” hose contains how many gallons?
18.35
100’ of 4” contains how many gallons?
65.25
100’ of 5” contains how many gallons?
101.94
What is a primer pump?
A positive displacement pump used to evacuate air from a centrifugal pump house omg allowing the pump to receive water
A Siamese does what?
An appliance that turns 2 lines into one
A wye is?
An appliance that breaks one hose line into two
What is the formula for finding column in a rectangle or square?
L x W x D x 7.5 (number of gallons in a cubic foot)
If using a pool with 3’ shallow and 9’ deep end. Take the average of those and divide by two
3+9/2=6
How would you know how many pounds of water were in a rectangular box?mi no
L x W x D = cubic feet
Total #of cubic feet x 62.5 (weight of a cubic foot)
How do you find the column in a cylinder?
π x R2 x H or L x 7.5
What is the formula to find the gpm out of a smooth note?
- 7 x d2 x square root of NP
29. 7 is the constant.
What’s the square root of 50, 80, 100
7.07
8.94
10
What are the tip sizes gpm master and hand line as well as foreground and theoretical?
15/16- 185
1 1/8- 266 & 250
1 1/4- 328 & 325
Above 80psi
1 1/4- 415 & 400
1 3/8- 502 & 500
1 1/2- 598 & 600
1 3/4- 814 & 800
2- 1062 & 1000
What does a piercing nozzle flow?
125 gpm at 100 psi
What does a deacon shower flow?
270 gpm at 75 psi
What can a forestry nozzle flow?
12-60 gpm some 22 gpm at 100psi
The 2.5 and 1.5 distributer nozzle flows?
- 5- 250 gpm at 100psi
1. 5- 95 gpm at 50psi
The 2.5 and 1.5 cellar nozzle flows what?
- 5- 350 gpm at 100psi
1. 5- 160 gpm at 100psi
What are the four principles of friction loss?
1) double the length of hose and double the friction loss
2) if the flow rate is doubled the friction loss will be 4 times greater
3) when the flow remains constant the friction loss in a hose will decrease when the hose increases
4) friction loss is velocity based meaning the faster you move water the more friction loss you will have
What are the friction coefficients?
1”-150 1 3/4- 10 (15.5 per ifsta) 2”- 8 2.5”- 2 3”- .8 4”- .2 5”- .08
What are your appliance loss pressures?
350gpm and under- 0 350 gpm and greater- 10 25- ladder pipes 25- master streams 25- standpipes
A column of water exerts pressure of what psi at a foot high?
.434 psi
The JS-10 can be used as variable spray or straight and has to be fully open or closed. And has a NP and gpm of what?
100 gpm and100 psi at the tip
The inline foam educator must be how many feet from the pump?
50ft to prevent turbulence from the pump
The foam educator is capable of flowing how many gpm
95-125 gpm
