Chapter 11 - Static Water Supply Sources

Question 1

____ is the difference in elevation between the surface of the static water supply and the center of the pump intake.

Answer 1

Lift

Question 2

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 ___________________.

Answer 2

Angle
Negative pressure
Atmospheric pressure

Question 3

For every _____ feet of altitude, the atmospheric pressure decreases by approximately ___ psi.

Answer 3

1,000 feet

0.5 psi

Question 4

Pumpers can not be expected to draft water that is located _____ feet below the level of the pump.

Answer 4

33.9 feet

Question 5

Variables affecting maximum lift include the _________ pressure, the condition of the ____________, and the _______, _______, and all ______.

Answer 5

Atmospheric
Fire pump and primer
Intake hose, gaskets and all valves

Question 6

In most circumstances, maximum lift is approximately ___ feet.

Answer 6

25 feet

Question 7

Equation for determining maximum lift:

Answer 7

L = 1.13 Hg

Hg - Gauge reading in inches Hg

Question 8

Every fire pump that is operating properly should have a dependable lift of at least ____ feet.

Answer 8

14.7 feet

Question 9

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.

Answer 9

3 feet

20 feet

Question 10

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.

Answer 10

70%
5 ft
60%

Question 11

Formula for Pressure Correction

Answer 11

PC = (Lift + Total Intake Hose Friction Loss) / 2.3

Lift = Required lift in feet
TIHFL = Number from table 11.2

Question 12

Formula for Net Pump Discharge Pressure at Draft

Answer 12

NPDP = PDP + PC

PDP = Pump Discharge Pressure
PC = Pressure Correction

Question 13

Floating pumps placed in adequate water source can develop and maintain a flow of up to ___ gpm.

Answer 13

500 gpm

Question 14

Common artificial static water supply sources include:

5

Answer 14

> Cisterns
> Private water storage tanks
> Ground reservoir
> Swimming Pools
> Agricultural irrigation systems

Question 15

Cisterns typically range from ______ to _______ gallons

Answer 15

10,000 to 100,000 gallons

Question 16

Formula for square/rectangular Pool Capacity:

Answer 16

C = 7.5 x L x W x D

7.5 = # of gallon per cubic foot

Question 17

Formula for round Pool Capacity

Answer 17

C = 7.5 x π x r² x D

7.5 = # gallons per cubic foot

Question 18

Agricultural irrigation systems in some jurisdictions may flow in excess of _____ gpm and may function as a potential water source for fire protection.

Answer 18

1,000 gpm.