Hydraulics Flashcards
What is 70% capacity of the pump
200 p.s.i.
What is 100% capacity of the pump?
150 p.s.i.
What is 50% capacity of the pump?
250 p.s.i.
What is the G.P.M. for smooth bore nozzles on the monitor?
1 1/4 = 400 gpm 1 1/2 = 600 gpm 1 3/4 = 800 gpm 2 = 1000 gpm 1 3/8 = 500 gpm 1 5/8 = 700 gpm 1 7/8 = 900 gpm take the first number of the fraction and add 2
What is head pressure per foot
.434 psi
What is head pressure per floor
5 psi
1 lb of water will rise?
2.304 feet when 1 psi is applied. at atmospheric pressure (14.7 psi) it will rise 33.86 feet
Gallons per cubic foot
7.48 gallons
pounds per cubic foot
62.5
pounds per gallon
8.33 pounds
cubic inches per gallon
231 cubic inches
Stand pipe friction loss
25 psi
Monitor friction loss
15 psi
4 way valve friction loss
15 psi
wye or siamese friction loss
0 psi
volume of rectangle
C = LWH x 7.5
volume of cylinder
C = 6 times D squared times H
Weight of cylinder
W = 6 times D squared times H times 8.33
Weight of rectangle
W = LWH times 62.5
Calculate GPM
29.71 times d squared times the square root of p = GPM
Calculate friction loss
2 times Q squared plus Q
Relay Pumping
EP = FL + 20 not to exceed 200 psi
Initial Operating Pressure
130 psi
Sprinkler System/FDC Operating Pressure
150 psi
Calculate Friction Loss Below 100 gpm flowing
2Q squared + 1/2Q
Handheld Fog nozzle pressure
100 psi
Handheld smooth bore nozzle pressure
50 psi
Master stream fog nozzle pressure
100 psi
Master stream smooth bore nozzle pressure
80 psi
FL factor for 4 inch hose
.25
FL factor for 1 3/4 inch hose
2
FL factor for 1 1/2 inch hose
4
FL factor for 1 inch hose
11
FL factor for 3/4 inch hose
24
Available hydrant flow with less than 10% drop on compound gauge
3 like gpm lines
Available hydrant flow with between 11 and 15% drop on compound gauge
2 like gpm lines
Available hydrant flow with between 16 to 25% drop on compound gauge
1 like gpm line
GPM for handheld smooth bore nozzles
1 inch = 200 gpm
1 1/8 inch = 250 gpm
1 1/4 inch = 325 gpm
What is max theoretical lift in regards to drafting
The distance 1 psi will raise 1 pound of water at any given elevation. 2.304 feet times atmospheric pressure (at sea level max lift is 33.86)
What is practical lift in regards to drafting
2/3 the height of max theoretical lift, which turns out to be roughly 22’
What is the nozzle pressure of the TFT Automatic nozzle on truck 11?
80 psi
What is the formula for smooth bore nozzle reaction?
NR = 1.57 times diameter squared times NP
What is the formula for automatic nozzle reaction?
NR = .0505 times diameter squared times the square root of NP
What is the definition of elevation?
The height of discharge relative to the eye of the pump
What is a BTU
The amount of heat required to raise the temperature of 1 pound of water 1 degree F
What are the 5 characteristic of water?
Absorbs heat, no tensile strength, incompressible, readily available, non toxic
When pumping the truck, how many supply lines are used?
3, 2 1/2 lines
How many GPM’s is the trucks master stream
1000-1250 gpm
What is the maximum distance one type 1 engine can supply three lines to the truck?
500 feet
What is the FL on the Ladder Trucks Trimese?
25 psi
How is friction loss calculated in the ladder pipe on truck 11
.5 psi per foot of elevation above the turntable. Max FL fully extended would be 50 psi
What are the 2 different options for pumping the truck
Option 1 - engine lays lines to and from the truck, sits at the hydrant and makes all calculations from the engine to the tip of the ladder pipe to achieve the desired gpm.
Option 2 - engine lays lines to and from the truck, sits at the hydrant and relay pumps to the truck (FL + 20 psi) and the truck engineer pumps from the truck panel to the tip.
What is latent heat of vaporization
The amount of additional heat energy required to convert one pound of water, at its boiling point, to vapor. For water it’s 970 btu’s
When pumping from the tank and charging the line, what should the ff be told
He is on tank water only
What is dependable lift in regards to drafting
The height at which water can be lifted to provide enough gpm for a reliable fire flow
How much does pump capacity decrease with 15’ and 20’ suction hoses when drafting
70% capacity at 15’
60% capacity at 20’
During constant pressure relay pumping, how much hose does each engine lay
750 feet, unless the supply engine is within 100 feet of the source, then 850 feet can be laid
What pressure gets pumped during constant pressure relay pumping
130 psi
When constant pressure relay pumping, how much should be left on the intake gauge
20 psi for safety, and to ensure the pump does not cavitat
During constant pressure relay pumping, when only pumping one line, how many feet can each engine lay
1,000-1,500 feet
