Chp 11

Question 1

Need for static sources

Answer 1

Rural area with no municipal supply
Suburban areas without full distribution network
Natural disasters break system

Question 2

Lift

Answer 2

Difference in elevation between surface of static water and pump

Question 3

Max lift determined by

Answer 3

Angle of intake hose
Amount of vacuum primer can make
Amount of atmospheric pressure

Question 4

Theoretical lift

Answer 4

Max lift if true vacuum were obtained

33.9’ at sea level

Question 5

Max lift

Answer 5

Highest water can be raised through a hose to the pump
Affected by atmospheric pressure, condition of hose pump and primer, gaskets and valves
Usually about 25’
No pressure left for firestream
L=1.13 Hg

Question 6

Dependible lift

Answer 6

Height water can be lifted and give a reliable fire flow
Usually 14.7’
Pumps tested at 3’ lift through 20’ hose, strainer 2’ under in water 4’ deep for 70 pump capacity

Question 7

Net PDP drafting

Answer 7

PDP + intake pressure correction

Question 8

Pressure Correction

Answer 8

PC=(Lift + Total intake hose FL)/2.3

Takes into account the friction loss in the intake hose and the height of the lift

Question 9

Net pump discharge pressure at draft formula

Answer 9

Good for US and metric

NPDP = PDP + PC

Question 10

Natural static water supply sources

Answer 10

Lakes, ponds, streams, rivers and oceans

Know approach and departure routes

Question 11

Adequacy of static natural sources

Answer 11

Lakes and rivers usually not a problem

Smaller ones may be susceptible to drought

Question 12

Accessibility of natural static water

Answer 12

Get pumper close
Soft ground on approaches
Water not deep enough
Silt or debris in water
Frozen water
Swift water
Bridge too high, to weak, sandy bank
Preplan to deal with all of above
Boat launches are great or use floating pumps (500 gpm) or fire boats, or water eductors

Question 13

Depth of water

Answer 13

2’ for barrel strainers
1’ for floating strainer
1-2” for low level strainer (used on water tanks) but low flow

Question 14

Silt in water

Answer 14

Clogs strainer, pump and fog nozzle
Need strainer on intake hose, don’t rest on bottom
If clogged, back flush with tank water
Can also install dry hydrants (less water but cleaner and good approach, subject to vandalism)

Question 15

Freezing water

Answer 15

Small ponds can freeze all the way down
Fill barrels with antifreeze
Set wooden plugs or plastic garbage cans to freeze
Cut a hole with chain saw, power auger, axe off a ground ladder

Question 16

Swift water

Answer 16

Dangerous to work around

Hard to keep hose submerged

Question 17

Artificial static water supply sources

Answer 17

Cisterns
Private water storage tanks
Ground reservoirs
Swimming pools
Agricultural irrigation systems

Question 18

Cisterns

Answer 18

Underground water storage where no hydrants
Supplied by well or runoff
Usually for ag or domestic
10,000 to 100,000 gallons
Access through a utulity cover or dry hydrant

Question 19

Private water tank

Answer 19

Residential, industrial, or ag
100 to 10k gallons
Ground level or elevated
Know, but don’t count of being full

Question 20

Ground reservoirs

Answer 20

Artificial pond or lake
Large commercial, industrial or municipal water treatment
Millions of gallons
Good roads, dry hydrants

Question 21

Swimming pools

Answer 21

Access limited
Family pool ok for single family home fire
May be drained in winter
Square pool capacity: 7.5xLxWxH
Round pool: 7.5 xp ix R^2 x Average Depth
Prepan, can have dry hydrant

Question 22

Agricultural irrigation systems

Answer 22

Flow 1000 gpm via open canal