Chapter 12 - Water Supply Flashcards
List the disadvantages of water?
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
How is the water distributed in the city of Ed
Direct pumping into a grid system
what is residual pressure?
the pressure not needed to overcome friction or head pressure
describe use of dry barrel hydrants?
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
list sources of water
municipal water distribution system
fire department vehicles with water storage tanks, portable tank
wells pools cisterns
rivers lakes ponds creeks
alternate methods to supple water at a fire scene?
drafting
relay pumping
water shuttle
tankers
list the colors of hydrant caps and respective flow rates?
Blue/black/silver greater then 5700 LPM
green - 3800 -5700 LPM
Yellow orange - 1900-3800 LPM
RED - less then 1900 LPM
fire hydrant service rings?
Orange - out of service (non operational)
blue - hydrant in use (with permission)
white - FD use only
green - under construction (do not use - no water)
what are the grooves on a coupling called?
Higbee indicator
what do the rings on the hydrant indicate?
the service status of the hydrant
list the 3 basic elements of a water shuttle?
fill site
dump site
shuttle
list the 3 main sizes and lengths of 3 main hoses used by EFRS?
44 mm. 15 m
64mm. 15m
125mm. 7.5 and 15 m
what is a dutchmen?
a fold in a hose load that will prevent the coupling from turning or flipping
list the 4 types of hose damage?
mechanical
chemical
thermal
organic
what is water hammer?
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
big gate duties?
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
small gate duties?
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