 Shuffle Toggle OnToggle Off
 Alphabetize Toggle OnToggle Off
 Front First Toggle OnToggle Off
 Both Sides Toggle OnToggle Off
 Read Toggle OnToggle Off
Reading...
How to study your flashcards.
Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key
Up/Down arrow keys: Flip the card between the front and back.down keyup key
H key: Show hint (3rd side).h key
A key: Read text to speech.a key
Play button
Play button
93 Cards in this Set
 Front
 Back
fresh water weighs _____

8.33 lbs or 62.5 lb/ft3


specific heat

measure of heat absorbing capacity of a substance


latent heat of vaporization

amount of heat absorbed by substance when it changes from liquid to vapor


Each pound of water requires ___btu of additional heat to convert to steam

970


one gallon of water will absorb _____ of heat if all the water is converted to steam

9,346 btu


at 212 degrees water expands approximately ____ times its original volume

1700


specific gravity

the density of liquids in relation to water


the weight of 1 cubic foot of water is ___

62.5 lbs


a 1 sq inch column of water one foot high exerts ____ at its base

.434 psi


Principles of pressure
1. fluid is ________to any surface on which it acts 
perpindicular


Principles of pressure
2. fluid pressure at a point at rest is the _____ in all directions 
same


Principles of pressure
3. pressure applied to a confined fluid from without is _________________________ 
transmitted equally in all directions


Principles of pressure
4. the pressure of a liquid in an open container is ____________to its depth 
proportional


Principles of pressure
5. the pressure of a liquid in an open vessel is ___________ to the density of the liquid. 
proportional


Principles of pressure
6. the pressure of a liquid at the bottom of a vessel is _______ of the shape of the vessel 
independent


atmospheric pressure

14.7 psi


a pressure of 1 psi makes a column of mercury ____ high

2.04 inches


psig reads _____

psi in addition to atmospheric pressure


psia reads

actual atmospheric pressure


calculating head pressure

height divided by 2.304


static pressure

stored potential energy


residual pressure

part of the total available pressure not used to overcome friction loss. what is left


The center line of a pump or the bottom of a static water supply source above or below groundd level

elevation


the position of an object above or below sea level

altitude


atmospheric pressure drops by ____ every thousand feet

.5 psi


1st principal of friction loss

if all conditions remain the same, FL varies directly with the length of hose


2nd principle of FL

when hoses are the same size, friction loss varies approx with the square of the increase in the velocity of flow


3rd principle of FL

for the same discharge, FL varies inversely as th fifth power of the diameter of the hose


4th principle of FL

for a given flow velocity, FL is approx the same, regardless of the pressure on the water


when the diameter of a hose ____ the area of the hose opening increases _______

doubles, four times


recommended supply size for fire hydrant mains in residential areas

6"


residential and business areas should have ___" cross connecting mains every ____'

8, 600


recommended size of hydrant supply main in business and industrial areas

8"


___" mains may be used on long mains not cross connected at frequent points

12"


average amount of water used in a system over 1 year

average daily consumption


max total amount of water that was used during any 24 hour period over 3 years

maximum daily consumption


maximum amount of water used in any 1 hour interval over the course of a day

peak hourly consumption


solid stream mozzles length is ________times its diameter

1 1.5 times


solid stream handline ____psi

50


solid stream master stream ___psi

80


GPM formula

29.7x d2 x sq rt NP


most constant flow nozzles should be operated at ___psi

100


minimum flow setting for interior structural firefighting is_____

95100 gpm


high pressure fog nozzles operate at up to ____psi and flow ____gpm

800, 815gpm


maximum amount of water you can safely flow through a handline ______

350 gpm


smooth bore master stream operated at ____ and fog master operated at ______

80psi, 100psi


master stream flows are usually _____ or grreater

350 gpm


at a pressure of 100 psi a chimney nozzle usually produces ____ gpm

1.53


practical working limits of velocity of fire streams

60120 feet per second


solid stream nozzles operated at 50 psi with a tip up to

1.5"
larger than that psi raised to 65 

nozzle reaction formula for solid stream

NR= 1.57xd2xNP


nozzle reaction formula for fog

NR=0.0505xQx sq rt NP


friction loss equation

FL=CQ2L
Q divided by 100 L divided by 100 

1 3/4 with 1 1/2 couplings coefficient

15.5


2 1/2 " coefficient

2


5" coefficient

.08


4" coefficient

0.2


1" booster coefficient

150


appliance FL only counted with flow over _____

350 gpm


appliance FL when flowing over 350 gpm

10 psi


FL in master stream appliance regardless of flow

25 psi


elevation formula for height

EP=0.5H (height)


elevation formula for stories

EP=5psi x (number of stories minus 1)


FL in equal length hoselines whose diameters are the same ______

perform calc on only one line


siamesed hose lines of equal length have FL of ____ that of a single hoseline at same pressure

25%


three siamesed hoselines have FL ____ of that of s single line with same nozzle pressure

10%


FL with multiple uneven lines is based on ______

the highest loss


aerial devices have FL of _____

25 psi


pump discharge pressure formula

PDP=NP+TPL


net pump discharge pressure

actual presure produced by pump
discharge pressure minus intake pressure 

NFPA 1901 allows flowmeters to be used instead of pressure gauges on all disharges ___to___

1.53"


flowmeters should be accurate to a tolerance of _____

+or 3%


multi cylinder piston pumps can provide pressures up to ___ for high pressure fog

1000 psi


amount of water a rotary gear pump can priduce depends on______

the size of pockets in the gears and speed of rotation


one of the most common types of pumps used to prime centrifugal pumps is ____

rotary vane pump


centrifugal pump impeller does what

transmits energy in the form of velocity to the water


centrifugal pump casing does what

collects water and confines it in order to convert velocity into pressure


doubling the speed of the impeller results in ___times as much pressure

4


single stage centrigugal pumps provide up to _____gpm

2000


pumping in parallel provides more ____

volume


pumping in series provides more_____

pressure


most pump manufacturers reccomen keeping pump in ____ position until you have to flow more than ____ rated capacity

series (pressure), two thirds


maximum discharge pressure that changeover valve should be operated at is______

50 psi


pumping capacity of auxilliary engine driven pumps is generally ____

500 gpm


with engine idling and pump engaged most speedometers will read _______

1015 mph


the piping system and pump must be able to withstand a hydrostatic test of ___psi

500


pumpers with capacity of 500gpm or less should be capable of flowing _____ from their booster tank

250 gpm


pumpers with capacity greater than 500 gpm should be able to flow at least _____

500 gpm


apparatus with pump capacity of 750 gpm or greater must have ____ _____ discharges

at least two 2.5"


apparatus with water tanks less than 1000 gallons must have a ___" tank fill line

2"


pressure control devices must operate within ___to___ seconds after pressure rises and cannot exceed ____ above set level

310, 30psi


master intake gauge is calibrated from ___to___ positive pressure and ___to___ vacuum

0600 psi, 030 inches


as vacuum reading approaches ___ pump is near its max capacity

20"
