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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"
