Pump Operator Study Guide
Card Set Information
Pump Operator Study Guide
Driver Engineer Hydraulics
1 gallon of water weighs?
1gallon of water in CI (cubic inches)
Cubic inches (ci) in a cubic foot (cf)
1 cf of water weighs?
1 cf in gallons?
1 sq foot in ci?
Height to create 1 psi?
1 psi will raise a column ?
Pressure is based on ht. Preferred formula for psi if you have height?
psi = h x .434
Formula for height if you have psi?
H = psi / .434
Formula for volume in a cylinder in cubic ft.
x L x 7.481(gallons in cf)
Formula for cubic feet?
CF = .7854 x D
Formula for tank volume (rectangle)?
L x W x H = CF
Formula for volume in gallons (rectangle)?
7.481 gallons in a CF
L x W x H x 7.481 = volume in gallons
Atmospheric pressure at sea level?
Max elevation decrease for drafting?
Head pressure is for elevation. Add ___ psi per foot.
add 4.34 psi per foot of elevation
Back pressure is for decrease in elevation. Decrease ___ psi per foot.
decrease 4.34 psi per foot
Pressure while water standing still in pipes.
Standard pressure in pipes.... fluctuates during peak water hrs.
normal operating pressure
Left over pressure
Pressure of the line while flowing
Pressure of the pump while pumping
net pump pressure
Convert tip size into decimal equivelalent.
Divide top number by bottom number.
example - 3/4" tip = .75
Formula for figuring discharge of a smooth bore nozzle.
Q = 29.7 x D
Formula for calculating hydrant discharge
Q = 2.97 x D
x √P x .9
√P = (sq root of hydrant Pressure)
Nozzle reaction is measured in ___ not ____.
lbs not psi
Formula for calculating nozzle reaction on smooth bore nozzle.
1.57 x D
x NP = NR
Formula for calculating nozzle reaction for fog nozzle.
.0505 x Q x √NP = NR
total pressure loss - to be added to nozzle pressure. Includes FL, elevation, appliance loss.
note* when asked for TPL only include the higher FL line in equation
Difference between TPL and TPDP?
(Total Pump Discharge Pressure)
TPDP is TPL + NP.
Define Equation A
FL = CQ
(used to determine FL in fire hose)
C is coefficient. # related to size hoze in diameter
Q is quantity GPM. Divide by 100. ex- GPM/100
L is length. Divide by 100. ex- L/100
Coefficient for 1 1/2"
Coefficient for 1 3/4
Coefficient for 2 1/2"
Coefficient for 3" with 2 1/2" coupling
Coefficient for 3" with 3" coupling
Coefficient for 4"
Coefficient for 5"
When laying multiple lines, add which nozzle pressure?
The higher pressure
Fog nozzle pressure
Smooth bore nozzle pressure
Master stream nozzle pressure
Add ____ psi for pressure loss in an appliance if gpm greater than ____
add 10 psi if greater than 350 gpm
Appliance loss for a master stream?
25 psi regardless of flow
Is a standpipe considered an appliance?
Define equation B
Used for elevation loss or gain
E = H x .5
Maximum GPM a hose can handle
Critical velocity of 1"
Critical velocity of 1 1/2"
Critical velocity of 1 3/4"
Critical velocity of 2 1/2"
Critical velocity of 3"
Critical velocity of 5"
Define equation C
EP = 5 psi x (number of stories -1)
3rs story is + 10 psi
Do you add appliance loss?
Truck to truck pressure loss? How much do you add?
If you use 2 lines, add 10 psi to each line.
Psi to operate a standpipe?
150 up to 10th floor.
180 psi above 10th floor.
Max psi for standpipe?
Add 10 psi to standpipe for every ____ feet of hose.
Formula for sprinkler system?
1/2 P (pressure) + 15 = Q (gpm)
To operate sprinkler system start at ____ psi.
Go up in increments of 25 psi.
Max of 200 psi.
Define equation E
Net Pump Discharge Pressure
NPDP = PDP - intake readings.