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Pumping Apparatus Driver/Operator Handbook > ch10 Fire Pump Theory > Flashcards

ch10 Fire Pump Theory Flashcards

1
Q

blank pumps are used as priming devices to get water into centrifugal pumps during drafting operations

A

positivie displacement pumps

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2
Q

blank pumps are the simplest of all fire apparatus pumps from the standpoint of design

A

Rotary-type

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3
Q

The blank pump consists of two gears that rotate in a tightly meshed pattern inside a watertight case

A

Rotary gear pump

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4
Q

The blank pump is constructed with movable elements that automatically compensate for wear and maintain a tighter fit with closer clearances as the pump is used

A

rotary vane pump

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5
Q

In this type of pump the rotor is mounted off center inside the housing

A

Rotary vane pump

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6
Q

The blank pump is classified as a nonpositive displacement pump because it does not pump a definitive amount of water with each revolution. Rather it imparts velocity to the water and converts it to pressure within the pump itself

A

centrifugal pump

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7
Q

the operation of a centrifugal pump is based on the principle that?

A

A rapidly revolving disk tends to throw water introduced at its center toward the outer edge of the disk

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8
Q

The blank transmits energy in the form of velocity to the water

A

impeller

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9
Q

the blank collects the water and confines it in order to convert the velocity to pressure

A

casing

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10
Q

the volume capability of the pump is dependent on the size of the blank of the impeller

A

eye

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11
Q

the greater the volume of water being flowed, the blank the discharge pressure

A

lower

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12
Q

doubling the speed of the impeller results in blank times as much pressure if all other factors remain constant

A

four

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13
Q

To minimize the blank thrust of large quantities of water entering the eye of the impeller, a double suction impeller was designed

A

lateral

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14
Q

Water being removed at two places and traveling in opposite directions cancels the blank thrust

A

radial

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15
Q

blank has an impeller for each stage mounted within a single housing

A

multi-stage centrifugal pump

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16
Q

When the transfer valve is in the pressure position, all the water from the intake manifold is directed into the eye of the blank

A

first impeller

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17
Q

the process of switching between pressure and volume is sometimes referred to as

A

changeover

18
Q

the blank valve are essential in a multi-stage pump

A

clapper

19
Q

the blank of the water moving through the impeller prevents most water in the discharge from escaping back into the intake

A

velocity

20
Q

The first indication that wear is becoming a problem is when?

A

Increased engine RPM is required to pump the rated capacity in pump tests

21
Q

To restore the capacity of the pump without replacing the pump itself, Blank or blank are provided in the pump casing to maintain the desired spacing between the hug of the impeller and the casing

A

replaceable wear rings, clearance rings

22
Q

the blank transfers the necessary energy to spin the impellers at a very high rate of speed

A

gearbox

23
Q

Proper mounting of these units is essential for dependable and smooth operation

A

PTO pumps

24
Q

The PTO unit is powered by an blank in the truck transmission

A

idler gear

25
Q

The typical unit is driven through a gear box and a clutch connected by a universal joint shaft to the front of the crankshaft

A

Front-Mount pumps

26
Q

Power is supplied to the pump through the use of a split-shaft gear case(transfer case) located in the drive line between the transmission and the rear axle

A

Midship pumps

27
Q

These units are driven by a shaft from the front of the vehicle’s engine

A

hydrostatic pumps

28
Q

blank pumps may be powered by either a split shaft transmission or by a PTO

A

rear mount

29
Q

The majority of all fires are initially fought with the water carried on the fire apparatus blank

A

tank

30
Q

The blank valve prevent damage to the tank if the tank to pump valve inadvertently opens when water is being supplied to the pump under pressure, such as during a relay

A

check

31
Q

Pumps that have a capacity of blank gpm or greater may require more than one large intake connection at each location

A

1,500

32
Q

Discharges to which 1.5, 1.75, and 2 inch handlines are attached must be supplied by atleast blank inch piping

A

2

33
Q

A tank fill line should also be provided from the blank side of the pump

A

discharge

34
Q

NFPA 1901 requires some type of pressure control devide to be part of any fire apparatus pumping system. The device must operate within 3 to 10 seconds after the discharge pressure rises and must not allow the pressure to exceed blank psi

A

30

35
Q

the main feature of a blank is its sensitivity to pressure change and its ability to relieve excessive pressure within the pump discharge

A

relief valve

36
Q

Blank are intended to reduce the possibility of damage to the pump and discharge hoselines caused by water hammer when valves/nozzles are closed to quickly

A

intake pressure relief valves

37
Q

it is generally recommended that intake relief valves be set to open when the intake pressure rises more than blank psi above the desired operating pressure

A

10 psi

38
Q

Most blank are also equipped with a manual shut-off valve that allows the water supply to the pump to be stopped if so desired

A

Screw on intake pressure relief valves

39
Q

the main feature of a blank is that it regulates the power output of the engine to match pump discharge requirement

A

pressure governor

40
Q

These use a pressure-sensing element(pressure transducer) that is connected to the discharge manifold

A

electronic governor

Pumping Apparatus Driver/Operator Handbook (11 decks)

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