Hydraulics Flashcards
The formula for determine the volume of rectangular shaped containers
L’ x W’ x D’ x 7.5 (number of gallons in a cubic foot)
Formula to determine the volume of a cylinder, pipe, or hose in gallons?
= pie x r2 x H’ (or L’) x 7.5
Formula for determining smooth bore nozzle discharge
gpm= 29.7 x d2 x square root of NP
Square root of 80 is 8.94
Square root of 100 is 10
Theoretical GPMs for a hand line at 50psi
Tip size Gpm
1/2”. 53
7/8”. 161
15/16”. 185
1”. 210
1 1/8”. 266
1 1/4”. 328
Theoretical GPMs for master stream at 80 psi
Tip size. GPM
1 1/4”. 415
1 3/8”. 502
1 1/2”. 598
1 3/4”. 814
2”. 1062
The 1” adjustable gallonage fog nozzle is adjustable flow nozzle that can be at to deliver?
12-60 gpm
The 1 1/2” Akron Assault nozzle flows?
175 gpm
The 2 1/2” Akron Fog Nozzle is an adjustable nozzle that can be set to deliver?
125-250 Gpm
Master stream fog nozzles have an operating range of?
150-2000 Gpm
Booster reels are usually 150’ long, 1” rubber line with an adjustable gallonage fog nozzle that can flow?
12-60 Gpm at 100 psi
(Other nozzles may be present)
Foresters hose comes in 50’ and 100’ sections. With an adjustable 1” fog nozzle it can flow?
12-60 Gpm
Or the 22gpm red fog can both be used at 100psi
The Decon showers are used for hazardous material incidents or to decon firefighter personnel. They flow?
270 Gpm at 75 psi
Piercing nozzles also called penetrating nozzles are commonly used to apply water to areas that are inaccessible to water streams, such as voids and attics. They flow?
125 Gpm at 100 psi
The 2 1/2” distributor nozzle flows?
250 Gpm at 100 psi
The 2 1/2” cellar nozzle flows?
350 Gpm at 100psi
The 1 1/2” cellar nozzle flows?
160 Gpm at 100 psi
3 different types of monitors in Fairfax
1.fixed monitors: permanently attached to pumper. Smooth bore flowing between 500-1000 Gpm
2. Quick attack mercury monitor flows 500 Gpm from either smooth or fog nozzle
3. Combination monitor. Are fixed to the pumper but can be detached and connected to a ground mount to be used as a portable monitor
- smooth bore flows between 500-1000gpm at 80 psi
-fog 350-1250 at 100 psi
1st principle
All variables being the same, friction loss will vary directly with the length of hose or pipe. Doubling the length h of hose doubles the friction loss.
2nd principle
The friction loss varies approximately with the square of the increase in the velocity of the flow. If the flow rate is doubled the friction loss will be four times greater.
3rd Principle
When the flow remains constant the friction loss in a hose will decrease when the diameter of the hose is increased. Larger the hose the smaller the friction loss.
4th principle
For any given flow velocity, friction loss is independent of pressure. The velocity of water through a hose line, not pressure, causes friction loss.
Friction loss coefficients for hose sizes:
1” 150
1 3/4” 10
2” 8
2 1/2” 2
3” .8
3 1/2” .34
4” .2
5” .08
Square root of 50?
7.071
Square root of 80?
8.94
1.75 squared
3.06
1.85 squared
3.42
One cubic foot contains ?
1728 inches
50’ length of 1.75’’ hose contains?
6.24 gallons of water
One cubic foot contains
7.5 gallons
50’ length of 2.5’’ hose
12.74 gallons of water
One gallon contains?
231 cubic inches
50’ length of 3” hose contains?
18.35 gallons of water
One gallon of freshwater weighs?
8.33 pounds
100’ length of 4 “ contains?
65.25 gallons of water
A column of water 1’ high exerts
.434 psi at the base
A column of water
2.304’ high exerts a pressure of 1 psi at its base.
100’ length of 5 ‘ hose contains?
101.94 gallons of water
A handline with a smooth bore nozzle has a psi of_______. The pressure can be increased to _______ psi for greater flow.
50, 65
A master stream with a smooth bore nozzle has a psi of ________. The pressure increased to________psi for greater flow.
80, 100
The JS-10 nozzle flows _______gpm at ______psi
100, 100
The portable foam eductor flows _______to ______gpm with a PDP of _______psi at the eductor
95, 125, 200
The edctor must be _______ft from the pump panel and within ________ft of the nozzle.
50, 200
The nozzle should be no higher than______ft above the eductor.
5
Maximum flows from a pumper at draft:
Side intake : 1750 gpm
Front Intake: 900 gpm
Rear Intake: 1500-1750 gpm
When incoming pressure exceeds ______psi, the pump shall be operated in pump gear.
50
Maximum inlet pressure for mercury monitor
150
Who has authority to request the aerial device to be supplied (two answers)
Charge lines on orders of the truck driver and oic.
All 4” supply lines should be charged to ______psi initially
50 psi
All 3” supply lines should be charged to ______psi initally
100 psi
If a 4” and 3” supply lines are used together, they should be charged to a minimum starting pressure of?
100 psi
What are the starting coefficients for two 3” lines?
.2
The 1 1/2” distributor nozzle flows?
95 Gpm at 100 psi
