Flashcards in Chapter 11 - Static Water Supply Sources Deck (18)
____ is the difference in elevation between the surface of the static water supply and the center of the pump intake.
The maximum height of the lift is affected by the ______ of the intake hose, by the amount of ______________ (vacuum) that the priming device can provide, and the existing ___________________.
For every _____ feet of altitude, the atmospheric pressure decreases by approximately ___ psi.
Pumpers can not be expected to draft water that is located _____ feet below the level of the pump.
Variables affecting maximum lift include the _________ pressure, the condition of the ____________, and the _______, _______, and all ______.
Fire pump and primer
Intake hose, gaskets and all valves
In most circumstances, maximum lift is approximately ___ feet.
Equation for determining maximum lift:
L = 1.13 Hg
Hg - Gauge reading in inches Hg
Every fire pump that is operating properly should have a dependable lift of at least ____ feet.
All fire department pumping apparatus are rated when drafting with a minimum lift of __ feet from the center of a pump intake to the surface of water through ___ feet of hard intake hose.
The pump may only deliver about ___ percent of its capacity if the lift is increased by ___ feet to a 15-foot lift, and ___ percent at 20-foot lift.
Formula for Pressure Correction
PC = (Lift + Total Intake Hose Friction Loss) / 2.3
Lift = Required lift in feet
TIHFL = Number from table 11.2
Formula for Net Pump Discharge Pressure at Draft
NPDP = PDP + PC
PDP = Pump Discharge Pressure
PC = Pressure Correction
Floating pumps placed in adequate water source can develop and maintain a flow of up to ___ gpm.
Common artificial static water supply sources include:
> Private water storage tanks
> Ground reservoir
> Swimming Pools
> Agricultural irrigation systems
Cisterns typically range from ______ to _______ gallons
10,000 to 100,000 gallons
Formula for square/rectangular Pool Capacity:
C = 7.5 x L x W x D
7.5 = # of gallon per cubic foot
Formula for round Pool Capacity
C = 7.5 x π x r² x D
7.5 = # gallons per cubic foot