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Apperatus Tech Test > IFSTA 9 Fire Pump Theory > Flashcards

IFSTA 9 Fire Pump Theory Flashcards

1
Q

Define positive displacement pump

A

Self priming pump that utilizes a piston or interlocking rotors to move a given amount of fluid through the pump chamber with each stroke of a piston or rotation of the rotors

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2
Q

Which type of pump is referred to as a “constant flow machine”

A

Positive displacement pumps

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3
Q

What are three characteristics of positive displacement pumps
pg 295

A

Self priming
deliver a definite volume of water or air
exhaust air from pump deliver water

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4
Q

define piston pump

pg 296

A

Type of positive displacement pump using one or more reciprocating pistons to force water from the pump chambers

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5
Q

define rotary pumps

page 296

A

Simplest of all fire pumps small capacity low volume high-pressure or priming driven by electric motor or clutch

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6
Q

What are two types of rotary pumps

page 296

A

rotary gear

rotary vane

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7
Q

define rotary gear pump

page 296

A

two gears rotating a tightly messed pattern inside a water tight case

amount of water pumped depends on size of the pockets in the gears and speed rotation

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8
Q

define rotary vane pump

page 298

A

positive displacement pump using hydraulic systems a rotor with attached veins is mounted off center inside a pump housing pressure is imported on the water as a space between the rotor and pomp housing wall decreases. shelf adjusts with wear

most common type used in centrifugal fire pump primers



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9
Q

define centrifugal pump

page 298

A

non-positive displacement Pump with one or more impellers that rotate and utilize the centrifugal force to move water most modern pumps are this type

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10
Q

define impeller

page 299

A

Vained circulating member of the centripical pump that acts as the disc receiving water through the eye in a center transmits motion to water resulting in velocity

It’s speed determines the extent to which water may overcome the force of gravity

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11
Q

define volute

page 299

A

spiral divergent chamber which receives velocity energy of the water by the impeller and converts it to pressure

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12
Q

what three factors influences a centrival fire pumps discharge pressure
page 300

A

Amount of water being discharged

speed at which the impeller is turning

pressure of water when it enters a pump from a pressurize source (hydrant relay etc.)

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13
Q

define single stage centrifugal pump

page 300

A

Single impeller
maybe; front mount, PTO, auxiliary or midship

Flow capacity up to 2250 GPM

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14
Q

define multistage centrifugal pump

page 301

A

A pump with an impeller for each stage mounted in a single housing impeller is may be a denticle the same capacity on a single shaft capable of connecting and series or in parallel

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15
Q

define pumping in parallel
(volume position)
page 301

A

Total amount of water the pump can deliver is equal to the sum of all the impellers operating in stages together

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16
Q

Define pumping and series
(pressure position)
page 302

A

when transfer valve is set in pressure position all water from intake manifold is directed into the eye of the first impeller, The second impellar further increase pressure in delivers water a higher pressure into the discharge port

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17
Q

At what percent range is the first impeller increase pressure a discharge when pumping and series
page 302

A

50-70%

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18
Q

if there’s any doubt as to whether or not to operate and pressure or volume which should a driver operator choose
page 303

A

Volume (parallel mode)
the pump will be cable supplying 100% but really capacity at 150 psi at 10 feet of lift with 20 feet of suction hose while drafting

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19
Q

Power operated transfer valves may operate at pressures has high as what?
page 303

A

200 psi

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20
Q

The opening between the pump casing in the hub of the impeller is usually limited to what?
page 304

A

.01”, Any increase lessons the effectiveness of the pump

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21
Q

define wear rings

page 304

A

replaceable rings are attached to the impeller indoor pump casing to allow us all running clearance between impeller and pump casing without causing wear of either

to maintain the preferred spacing instead of replacing the entire pump

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22
Q

Which type of seal is the most common type used today to prevent air leaks between the shaft and the pump casing Because it requires no adjustment but does require operation of the pump regularly
page 306

A

Mechanical seals

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23
Q

what is the most common type of seal packing material?

page 306

A

Rope fibers impregnated with graphite or lead

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24
Q

what are packing rings

page 306

A

Primarily use on older fire pumps they wear with the operation of the shaft and can be tightened to address leaks

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25
Q

what type of seal offered superior resistance to warping stretching and corrosion
page 307

A

ceramic

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26
Q

Unlike centrifugal pumps positive displacement pumps can do what
3rd Ed page 296

A

Pump air

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27
Q

what provides for the movement of water through a piston positive displacement pump
3rd ed page 296

A

A piston that moves back-and-forth or upper down inside a cylinder

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28
Q

The output of the Piston positive displacement pump is determined by the size of the cylinder and what
2nd page 267

A

Speed of the piston travel

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29
Q

The capacity of a piston positive displacement pump it’s usually determined by the size of what
2nd page 267

A

cylinder

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30
Q

The rotary gear pump consists of what

3rd page 296

A

To gears that rotate in a totally messed pattern inside a watertight case

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31
Q

The total amount of water that can be pumped by a rotary gear pump depends on the size of the —— and the speed of rotation
3rd page 297

A

pockets in the gears

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32
Q

which of the following is one of the most common types of pumps used to prime centrifugal pumps
3rd page 298

A

Rotary vane pump

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33
Q

in a rotary vane pump how is the rotor mounted

3rd page 298

A

off center

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34
Q

The centrifugal pump imparts —— to the water and converts it to pressure within the pump itself
3rd page 298

A

velocity

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35
Q

The operation of a centrifugal pump is based on the principle that….
3rd page 299

A

revolving disc throws water introduced at its center toward the outer edge of the desk

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36
Q

The ——- of a centrifugal pump transmits energy in the form of velocity to the water
3rd page 299

A

impeller

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37
Q

The —— of the centrifugal pump collects the water & confines it, in order to convert the velocity to pressure

A

the casing

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38
Q

The —— of the centrifical pump is a water passage that gradually increases in cross-sectional area as it nears the pump discharge outlet
3rd page 299

A

volute

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39
Q

which three factors influence a centrifugal fire pumps discharge pressure
3rd page 300

A

Amount of water being discharged

speed at which the impeller is turning

pressure of water when it enters the pump from a pressurized source

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40
Q

Which centrifugal fire pumps impellers are capable of delivering the rated pressure while supplying 50% of the rated capacity, so that the total amount of water the pump can deliver is equal to the sum of each stage
3rd page 301

A

Multi stage centrifugal pump in the parallel position

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41
Q

what centrifugal pump works by directing all water from the manifold into the eye of the first impeller increasing the pressure and discharging 50 to 70% of the volume capacity through the transfer valve and into the eye of the second impeller
3rd page 302

A

Multistage centrifugal pump and series position

42
Q

define changeover

3rd page 302

A

Process of switching between pressure and volume position

43
Q

Most manufactures specify that the pump may remain in the pressure system until it is necessary to flow more than ——- of the rated volume capacity
2nd 275

A

1/2

44
Q

packing rings are used to make a seal at the point where the shaft passes through what
3rd page 306

A

Pump casing

45
Q

As packing rings wear with the operation of the shaft, the ——- can be tightened and the leak controlled
3rd page 306

A

Packing gland

46
Q

what are supplied to provide Cooling and lubrication between the packing rings and shaft
3rd page 306

A

Lantern rings

47
Q

Pumps equipped with —— will not drip and will not require adjustment
2nd 280

A

Mechanical seals

48
Q

piping systems must be able to withstand a hydrostatic test of —— before being placed in service
3rd page 312

A

500 psi

49
Q

tank to pump piping should be sized so that pumpers with a capacity of 500 GPM or less should be capable of flowing —— GPM from the booster tank
3rd page 312

A

250 gpm

50
Q

Tank to pump piping should be sized so that pumpers with a capacity greater than 500 GPM should be capable flowing at least ——- GPM from the booster tank
3rd page 312

A

500

51
Q

According to NF PA 1901, enough
2 1/2 inch or larger diameter outlets must be provided in order to flow what
3rd page 314

A

The rated capacity of the pump

52
Q

all discharge valves should be designed so that they are easily operable at pressures up to what
3rd page 314

A

250 psi

53
Q

Valves control most of the ——-lines from the pump

3rd page 316

A

intake & discharge

54
Q

what type of valve permits full flow through the lines with a minimum of friction loss
3rd page 316

A

ball type

55
Q

Gate valves are most often operated by what

3rd page 317

A

handwheel

56
Q

butterfly valves are most often operated by what

3rd page 317

A

1/4 turn valve

57
Q

automatic pressure control devices must not allow the pressure to exceed ——- psi above the set level
3rd page 319

A

30

58
Q

which types of automatic pressure control devices are sensitive to pressure change and have the ability to relieve excessive pressure within the pump discharge
3rd page 319

A

Discharge pressure relief valves

59
Q

which types of automatic pressure control devices are intended to reduce the possibility of damage to the pump and discharge hose lines caused by water hammer
3rd page 320

A

Intake pressure relief valves

60
Q

which type of automatic pressure control devices use a pressure sensing element connected to the discharge manifold to control the action of the electronic pump amplified that compares pump pressure to electrical reference point
3rd page 321

A

Electronic governors

61
Q

which type of automatic pressure control device relieves excessive pressure that is generally caused by shutting down one or more operating hose line
3rd page 321

A

Electronic governors

62
Q

Which type of automatic pressure control device has an adjustable spring loaded pilot valve that acts as a relief valve to bypass water from the discharge to the intake chamber of the pump
3rd page 319

A

Intake pressure relief valves

63
Q

which type of primer uses an oil supply or some other type of fluid to seal the gaps between the gears and the case and to act as a preservative and minimize deterioration
3rd page 322

A

Positive displacement primers

64
Q

which type of primer is environmentally friendly and does not require lubrication
3rd page 323

A

Oil less primers

65
Q

Which type of primer requires that any air leaks In the pump be kept an absolute minimum and it’s suction hose in gaskets be kept in good condition
2nd page 300

A

exhaust primers

66
Q

which type of primer primes the pump by connecting a line from the intake manifold of the engine to the intake of the fire pump with a valve connected in the line to control it
3rd page 323

A

Vacuum primers

67
Q

which pump panel instrument provides an indication of the vacuum present at the intake of a pump during priming
3rd page 324

A

Master Intake gauge

68
Q

midship pumps may be operated by either a series of gears or what
3rd page 309

A

drive chain or belt

69
Q

in mid ship mount pumps the gear ratio is set so that the rotation required for the impeller to deliver a rated capacity of the pump is usually how many times faster than the engine itself
3rd page 310

A

1.5 to 2.5

70
Q

What two factors affect the maximum capacity that can be obtained from a midship pump
3rd page 310

A

Engine horsepower and size of the pump

Some pumps may deliver 500 to 2250 GPM

71
Q

With the engine idling in the pump engaged most speedometers will indicate between —— to —— mph
3rd 310

A

10-15

72
Q

Rear mount pumps

A

Better weight distribution in compartment space

Expose drivers on coming traffic

Maybe powered by split shift or PTO

73
Q

many pumpers are equipped with tank to pump piping as large as —— inches in diameter
3rd 312

A

4”

74
Q

where is the primer tapped into the pump

3rd 313

A

High Point on the suction side of the impeller Eye

75
Q

intake lines are located where in relationship to the pump above below or in line with

3rd 313

A

below

76
Q

What is the shape of the primary intake piping next to the fire pump
3rd 314

A

Becomes Square in shape near pump to eliminate the vortex which may occur in water that flows through circular piping

77
Q

Pumps rated greater than —— GPM capacity may require more than one large intake connection at each location
3rd 314

A

1500

78
Q

According to NFPA 1901, fire apparatus with a rated pump capacity of 750 GPM or more must be equipped with how many 2 1/2 inch discharges
3rd 314

A

2

79
Q

According to NFPA 1901 fire apparatus with a rated pump capacity of less than 750 GPM are required to have how many 2 1/2 inch discharges
3rd 314

A

1

80
Q

Discharges greater than ——- inches in diameter may not be located on the pump operators panel

A

2.5”

81
Q

What size discharge piping & valves must be used to supply discharges of one and a half to 2 inch hand lines
3rd 314

A

2”

82
Q

According to NFPA 1901 apparatus equipped with tanks less than 1000 gallons must have a tank fill line of at least —— inches in diameter
3rd 317

A

1

83
Q

what is the most common actuator for ball type valves

3rd 316

A

Push pull handles or quarter turn handles

84
Q

NF PA 1901 require all intakes or discharges that are ——- inches or greater in diameter to be equipped with slow acting valve controls
3rd 317

A

3”

85
Q

NFPA 1901 requires pressure control devices to operate within how many seconds after the discharge pressure rises and restricts the pressure
3rd 318

A

3-10 seconds

86
Q

NFPA 1901 requires a pressure control device to operate when it discharge pressure rises and restricts the pressure from exceeding —- psi above set level
3rd 319

A

30 psi

87
Q

Define discharge relief valve

3rd 319

A

Valve controls pressure that is delivered to the hose line nozzle from the pump

88
Q

define intake relief valve

3rd 319

A

Adjustable spring loaded pilot valve bypasses water from the discharge and a chamber of the pump permitting the pump to continue operation when pressure rises above working or set pressure

89
Q

it is generally recommended that when using add-on intake pressure relief valves, they be set to open with the intake pressure rises more than —— PSI of necessary operating pressure
3rd 320

A

10

90
Q

Define pressure governor

3rd page 321

A

Pressure control device controlling engine speed in eliminating hazardous conditions resulting from excessive pressure

91
Q

When drafting or pumping from the tank, the closed (draft) position is used. therefore water returns to the —- side of the pump
3rd 321

A

intake

92
Q

when pumping from a hydrant and in the hydrant (open) position is used so that the water is discharged where?
3rd 321

A

the ground

93
Q

 What is the most popular method to power a rotary vein priming pump?
3rd 322

A

electric motor

94
Q

What is the purpose of using an oil supply for conventional primer pumps
3rd 322

A

The thin film of oil draws into the pump and seals gaps between gears in the case

The oil fills and irregularities in the housing caused by sediment or debris

95
Q

generally speaking what is the ideal engine speed for priming
3rd 322

A

1000-1200 rpm

96
Q

When the vacuum reading on a master intake gauge approaches ——- inches the pump is nearing its capacity, and is not able to supply additional lines
3rd 325

A

20”

97
Q

Define voltmeter

3rd 326

A

Device used for measuring existing voltage in electrical system specifically battery condition

98
Q

define ammeter

3rd 326

A

gauge Indicating both the amount of electrical current being drawn from and provided to the vehicles battery. good indication of the status of the vehicles alternator and charging system

99
Q

auxillary “marine type” cooling device

A

Auxiliary cooling device that is inserted into one of the hoses used in the engine cooling system so that the engine coolant must travel through it as it circulates through the system.

features small tubes surrounded by water jacket connected to the discharge of the fire pump

100
Q

immersion type auxiliary cooling device

3rd 329

A

Auxiliary cooling device directing water supplied by the fire pump to pass through a coil or tubing mounted inside the cooler to the path so that it is immersed in the coolant

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