Chap.10 Ifsta Pumping Apparatus Driver/operator 2Nd Edition

Front 1

Types of positive displacement pumps.

Back 1

- Single action piston pump
- Double action piston pump
- Rotary Gear pump
- Rotary Vane pump

Front 2

What is the most used type of pump for priming centrifugal pumps?

Back 2

Rotary Vane

Front 3

What classification is a centrifugal pump ?

Back 3

nonpositive displacement pump

Front 4

What two parts does a centrifugal pump consist of?

Back 4

- Impeller
- Casing

Front 5

How fast does an impeller rotate on a centrifugal pump?

Back 5

2,000-4,000 rpm

Front 6

The centrifugal pump capacity is dependent on what?

Back 6

The size of the eye. The larger the eye, the greater the flow capacity.

Front 7

The gradually increasing water passage outside of the impeller that leads to the discharge outlet of the pump.

Back 7

Volute

Front 8

The three main factors that influence a centrifugal fire pump's discharge pressure.

Back 8

- Amount of water being discharged.
- Speed at which the impeller is turning.
- Pressure of water when it enters the pump form a pressurized source.

Front 9

The greater the volume of water being flowed, the _____ the discharge pressure.

Back 9

Lower

Front 10

The greater the speed of the impeller, the _______ the pressure developed.

Back 10

Greater

Front 11

Doubling the speed of the impeller results in _____ times as much pressure if all other factors remain constant.

Back 11

Four

Front 12

What are the two basic types of centrifugal pumps?

Back 12

- Single-stage
- Two-stage

Front 13

To minimize lateral thrust of large quantities of water entering the eye of the impeller, what type of impeller was developed?

Back 13

Double Suction impeller

Front 14

If a two stage pump, in parallel, is rated to flow 1000gpm at 150psi, How many gpm does each impeller supply?

Back 14

500 gpm

Front 15

When pumping in series, the total amount of water that can be delivered is limited by what?

Back 15

The amount that one impeller can supply.

Front 16

The process of switching between pressure and volume, on a multi-stage pump, is referred to as what?

Back 16

changeover

Front 17

At lower flow rates, operating in the series position reduces what?

Back 17

The load and required RPM of the engine.

Front 18

Switching form volume to pressure, in a multi-stage pump, results in an immediate ________ of the previous discharge pressure.

Back 18

Doubling

Front 19

What is the maximum recommended pressure for operating a transfer valve on a multi-stage pump?

Back 19

50 psi

Front 20

If here is any question as to the proper operation of the transfer valve, it is better to be in the ________ than in ______.

Back 20

parallel; series

Front 21

A very close tolerance must be maintained between the pump casing and the hub of the impeller. This opening is limited to how much?

Back 21

.01" or less

Front 22

Power-operated transfer valves can be operated at pressures as high as what?

Back 22

200 psi

Front 23

What is the first indication that wear on the pump case and impeller is becoming a problem?

Back 23

Increased RPM s needed to pump the rated capacity in pump tests.

Front 24

What is the result of allowing water to churn in the pump, without flow, for extended periods of time?

Back 24

The water in the pump becomes hot and the metal parts tend to expand causing excess wear on the pump.

Front 25

The driver/operator can check pump temperature by doing what?

Back 25

Placing hand on the direct pump intake pipe of the pump.

Front 26

If packing is too tight, water is not allowed to flow between the packing and the shaft. What is the result of this condition?

Back 26

excessive heat build-up

Front 27

After periods of dryness, adjustments to the pump packing should not be made until what has been done?

Back 27

The pump has been operated under pressure and the packing has had chance to seal properly.

Front 28

When deciding on mounting arrangements and pump drive systems, for building a pumper, what should be considered?

Back 28

- Cost
- Appearance
- Space required
- Ease of maintenance
- Tradition
- Use that the system receives

Front 29

What are the most common applications for auxiliary engine driven pumps?

Back 29

- ARFF vehicles
- Wildland Fire apparatus
- Mobile water supply apparatus
- Trailer-mounted fire pumps
- Portable fire pumps

Front 30

What is the pumping capacity of most skid-mounted assemblies on small attack fire apparatus?

Back 30

500 gpm

Front 31

Auxiliary engine-driven umps used on ARFF apparatus and for trailer-mounted applications tend to be large capacity pumps rated to what?

Back 31

4000 gpm or more

Front 32

Where are trailer mounted pumps usually used?

Back 32

Industrial and fire training facilities

Front 33

If an apparatus is designed for pump and roll operations, where should there be a pressure gauge mounted?

Back 33

In the cab in full view of the driver

Front 34

If an apparatus is in a pump and roll operation, how should t be driven while hoselines are deployed?

Back 34

Driven by the pressure gauge instead of the speedometer.

Front 35

Conventional PTO units limit the capacity of the pump to what?

Back 35

500 gpm

Front 36

Why is the horsepower to a PTO limited to approximately 95?

Back 36

Because the PTO is mounted on the side of the transmission and that is the limits of what the housing can take?

Front 37

What are two disadvantages to front mount pumps?

Back 37

- They are more susceptible to freezing temperatures.
- Obstruct the airflow through the vehicles radiator.

Front 38

On midship pumps when the power is diverted to the pump, instead of the rear axle, The gear ratio is arranged so that the impeller turns how much faster than the engine?

Back 38

1-1 1/2 times faster

Front 39

With the engine idling and pump engaged, most speedometers read what?

Back 39

10-15 mph

Front 40

What is a disadvantage to rear-mount pumps?

Back 40

The Driver/operator may be more directly exposed to oncoming traffic than other pump positions.

Front 41

According to what NFPA standard should all components of the piping system be of a corrosion-resistant material?

Back 41

NFPA 1901

Front 42

The piping system as well as the pump must be able to withstand a hydrostatic test of what pressure before being placed into service?

Back 42

500 psi

Front 43

What are the two ways water can enter a pump?

Back 43

- Through piping from an onboard tank.
- Piping connecting the pump to an outside pressurized water source

Front 44

NFPA 1901 states that pumpers with a capacity of 500 gpm or less should be able to flow ___ gpm form their booster tank.

Back 44

250 gpm

Front 45

NFPA 1901 states pumpers with a capacity greater than 500 gpm should be able to flow at least how many GPM form their booster tank?

Back 45

500 gpm

Front 46

Why are all intake lines on a centrifugal pump located below the eye of the impeller?

Back 46

Because the Priming pump is tapped into the pump at the highest point possible to remove all air from the system when drafting.

Front 47

What intake pipe is the single exception to being below the eye of the impeller?

Back 47

The tank to pump line which is gravity fed.

Front 48

What should be considered to be auxiliary intakes to the pump-panel-mounted gated intakes unless they have been certified by the manufacturer?

Back 48

Front and rear intakes

Front 49

Pumps of what capacity or greater may require more than one intake connection?

Back 49

1500 gpm or greater

Front 50

All apparatus with a pump capacity of 750 gpm or greater are required to have how many 2 1/2 discharges?

Back 50

two

Front 51

Discharges larger than what are ma not be located on the pump operator's panel?

Back 51

2 1/2 inches

Front 52

Discharges to which 1 1/2 - 2" handlines are attached must be supplied by at least what size piping?

Back 52

2 inch

Front 53

All valves shoud be designed so they are easily operable at pressures of up to what?

Back 53

250 psi

Front 54

NFPA 1901 requires that tanks <1000 gallons have a __" fill line and >1000 gallons have at least a __" fill line

Back 54

1" ; 2"

Front 55

What is the most common type of valve found on a fire pump?

Back 55

ball-type valve

Front 56

NFPA 1901 requires that all intakes or discharges greater than 3" have what type of valves?

Back 56

Slow acting valve controls

Front 57

Where should drains be supplied?

Back 57

The lowest point on the pump and lowest points on each line connected to it.

Front 58

NFPA 1901 requires some type of pressure control device that must operate within what amount of time after the discharge pressure rises?

Back 58

3-10 seconds

Front 59

What are the two basic concepts for pressure relief valves?

Back 59

- Those that relieve pressure on the discharge side of the pump.
- Those that relieve pressure on the intake side of the pump.

Front 60

While discharge pressure relief valves are quick to react to over pressure conditions, they are sometimes slower to do what?

Back 60

Reset back to "all closed" positions

Front 61

What are the two basic kinds of pressure relief valves?

Back 61

-Supplied by the manufacturer ad an integral art of the pump intake manifold.
- Add-on device that is screwed onto the pump intake connection.

Front 62

It is generally recommended that intake valves be set to open when the intake pressure rises more than __psi above the desired operating pressure.

Back 62

10 psi

Front 63

Newer apparatus may be equipped with electric governors. These use a pressure sensing element connected to the discharge manifold called what?

Back 63

Pressure Transducer

Front 64

Electric governors are so accurate and quick to respond that they virtually eliminate the need for the pump to be equipped with what?

Back 64

Discharge pressure relief valve

Front 65

Primers fall into what three categories?

Back 65

- Positive displacement
- Exhaust
- Vacuum

Front 66

Which requires a higher RPM to operate? Rotary Vane primer or Rotary Gear primer?

Back 66

Rotary Vane Primer

Front 67

Engine driven primers should generally be able o operate with engine speeds of what?

Back 67

1,000-1,200 RPM

Front 68

NFPA 1901 requires the what controls to be on the operator's pump panel?

Back 68

- Master pump intake pressure
- Master pump discharge pressure
- Engine Tach
- Engine coolant temp
- Engine oil pressure indicator
-Voltmeter
- Pump pressure controls (discharge valves)
-Engine throttle
- Primer control
- Tank to pump valve
- Tank fill valve
- Water tank level indicator

Front 69

What is not required by NFPA 1901, but recommended to be located on the operator's pump panel?

Back 69

- Engine fuel gauge
- Automatic transmission temperature gauge

Front 70

What type of gauge should be on the intake side of the pump?

Back 70

Master Intake gauge
(also referred to as the vacuum or compound gauge)

Front 71

What is the master intake gauge usually calibrated to?

Back 71

0-600 psi positive pressure
0-30 inches mercury (vacuum) negative pressure

Front 72

The Master Pump Discharge pressure gauge should measure ___psi unlessthe pumper is equipped to supply high-pressure fog streams; in which case the gauge may be calibrated up to ____psi.

Back 72

600si ; 1000psi

Front 73

What indicates wear in the pump and the need for repairs?

Back 73

A gradual increase in the amount of RPM required to pump the rated capacity.

Front 74

When can overheating of the pump occur?

Back 74

When it is ran for prolonged periods of time when no water is being discharged.

Front 75

The throttle knob is also called what?

Back 75

Vernier

Front 76

What is the most reliable way to insure that the water tank is full?

Back 76

Visually check it during your routine daily inspection.

Front 77

What are the two types of auxiliary coolers commonly found on older apparatus?

Back 77

- Marine type
- Immersion type

Front 78

In situations where a dramatic failure of a radiator hose or other cooling system element occurs while the pumper is supplying hoselines for crews in dangerous positions, what can be done to keep the operation up for a short time?

Back 78

A hoseline can be directed onto the engine to maintain some form of cooling.