Chapter 12 - Water Supply

Question 1

List the disadvantages of water?

Answer 1

high surface tension. reduces rate of heat absorption

reacts with certain materials

low opacity and low reflectivity does not prevent radiant heat well

low viscosity, does not adhere well to vert surfaces

conducts electricity

steam from water can cause injurys

Question 2

How is the water distributed in the city of Ed

Answer 2

Direct pumping into a grid system

Question 3

what is residual pressure?

Answer 3

the pressure not needed to overcome friction or head pressure

Question 4

describe use of dry barrel hydrants?

Answer 4

used in cold climates. the operating valve is at the base of the barrel below the frost line. the barrel also has a drain valve system to expel water when it is not in use. When in use the drain valve is closed when the hydrant is off the drain valve is opened

Question 5

list sources of water

Answer 5

municipal water distribution system

fire department vehicles with water storage tanks, portable tank

wells pools cisterns

rivers lakes ponds creeks

Question 6

alternate methods to supple water at a fire scene?

Answer 6

drafting

relay pumping

water shuttle

tankers

Question 7

list the colors of hydrant caps and respective flow rates?

Answer 7

Blue/black/silver greater then 5700 LPM

green - 3800 -5700 LPM

Yellow orange - 1900-3800 LPM

RED - less then 1900 LPM

Question 8

fire hydrant service rings?

Answer 8

Orange - out of service (non operational)

blue - hydrant in use (with permission)

white - FD use only

green - under construction (do not use - no water)

Question 9

what are the grooves on a coupling called?

Answer 9

Higbee indicator

Question 10

what do the rings on the hydrant indicate?

Answer 10

the service status of the hydrant

Question 11

list the 3 basic elements of a water shuttle?

Answer 11

fill site

dump site

shuttle

Question 12

list the 3 main sizes and lengths of 3 main hoses used by EFRS?

Answer 12

44 mm. 15 m

64mm. 15m
125mm. 7.5 and 15 m

Question 13

what is a dutchmen?

Answer 13

a fold in a hose load that will prevent the coupling from turning or flipping

Question 14

list the 4 types of hose damage?

Answer 14

mechanical

chemical

thermal

organic

Question 15

what is water hammer?

Answer 15

is the term used to describe the destructive forces, evident in pounding nosies and vibrations, which develop in a piping system when a column of non-compressible liquid flowing through a pipe line at a given pressure and velocity is stopped abruptly

Question 16

big gate duties?

Answer 16

safely dismount w/ all ppe and radio

remove hydrant gate from rear

wrap 125mm hose around hydrant

stand on hose, signal small gate

when app is stopped or it is safe, remove steamer cap

inspect barrel of hydrant and connect gate

ensure drain valve is open

radio driver or sector officer that u are ready to turn on hydrant

open hydrant when ordered by driver or sect officer, close drain valve

gather tools, remove kinks and report to officer for reassignment

Question 17

small gate duties?

Answer 17

safely dismount w/ ppe and radii

if riding new smeal pump, open coffin doors, parking break must be engaged

retrieve hydrant kit from driver rear compartment

place kit near hydrant practical local for big gate

help big gate with supply line, wait for rdy signal

return to app and relay rdy signal to driver and officer

at the scene, safe dismount, uncouple supply line at nearest joint

attach supply line to appropriate app at scene

if located at intake connection, open intake drain valve

communicate to driver that line is rdy

report to officer for reassignment