Chapter 10

Question 1

Some apparatus have what feature if the parking brake has not been set, in regards to pumping?

Answer 1

A feature that prevents the pump from throttling up, or shifting into pump gear if the parking brake has not been set

Question 2

What are the two basic pressurized water supply sources?

Answer 2

Hydrant and supply hose from another pumper

Question 3

The least desirable type of hydrants, served by smaller mains from only one direction. And usually have a higher amount of sediment and deterioration.

Answer 3

Dead end mains

Question 4

Pressure decreases .5psi for every how many feet of altitude gain?

Answer 4

Every 1000ft

Question 5

The driver/ operator should realize when the pump nears this number of inches of mercury the pump is nearing its limits of its ability to supply water?

Answer 5

Most pumps are able to develop a vacuum capacity of approximately 22 inches of mercury. Any reading close to this point indicates the pump is nearing the limits of its ability to supply water

Question 6

Cavitation can be described as?

Answer 6

Water being discharged faster than it can it is coming into the pump

Question 7

What are some indicators of pump cavitation?

Answer 7

The pressure gauge will fluctuate, and hose streams may pulsate creating a distinctive popping or sputtering sound as water leaves the nozzle. In severe cases the pump itself may sound like gravel is passing through the pump. Surest indication is lack of reaction on the pressure gauge to increases in the throttle.

Question 8

In order for a pumper to approach its rated capacity using a traditional strainer, there must be how many inches of water over the strainer?

Answer 8

24 inches, it is helpful to have 24 inches all around in order to avoid drawing foreign objects such as sand and gravel into the pump

Question 9

In order for a floating strainer to work properly, it must?

Answer 9

Be able to float freely, unconstrained by the rigidity of the intake hose

Question 10

What must the driver operator think of in regards to using a floating strainer in regards to discharge capacity?

Answer 10

The pumper may not receive enough water to achieve its rated discharge capacity

Question 11

Water below this temp and above this temp will adversely impact the ability of the pump to reach capacity?

Answer 11

Below 35 F and above 90 F

Question 12

True or false pumping no potable water can be harmful to the pump?

Answer 12

True

Question 13

Each time nonpotable water is pumped through the apparatus, what should be done?

Answer 13

The pump and piping should be throughly flushed with fresh water soon afterwards

Question 14

A pumper in good working order can lift water a max of how many feet?

Answer 14

25 ft

Question 15

To create an effective water stream, a lift of no greater than how many feet is recommended?

Answer 15

No greater than 20 ft, working with this lift, the pump operates at about 60% of its rated capacity

Question 16

What are important considerations during draft site selection?

Answer 16

Stability of the ground surface, the conscience of connecting hose lines, and the safety of the driver operator.

Question 17

For two stage pumps, the transfer valve must be in what position?

Answer 17

In parallel (volume) position. A pump in series (pressure) position may trap air that will need to be removed

Question 18

Most priming pumps are intended to work most efficiently when the engine is set at a rate between?

Answer 18

1000 and 1200 rpm

Question 19

If the apparatus features a vacuum type primer, the engine rpm should be set to?

Answer 19

As low as possible without causing the engine to stall

Question 20

As the primer operates, the vacuum reading should?

Answer 20

Increase as atmospheric pressure forces water into the intake hose

Question 21

The entire priming action typically requires how much time?

Answer 21

10 to 15 seconds from start to finish, when up to 20 ft of intake hose lifting a max of 10 ft it may take as long as 30 seconds (45 seconds) in pumps larger than 1250 gpm

Question 22

What is the most common cause of air leaks?

Answer 22

Open drain or valve

Question 23

What should be done after successfully priming the pump?

Answer 23

Throttle setting should slowly be increased before attempting to open any discharges. This is required to increase the pressure between 50-100 psi.

Question 24

True or false without moving water, even a small air leak may result in a loss of vacuum?

Answer 24

True

Question 25

While the pump is operating, a gradual increase in the vacuum may be noted with no change in flow rate, this is an indication of?

Answer 25

A blockage is developing

Question 26

Where is the most common place for a blockage to occur?

Answer 26

In the strainer

Question 27

How should you shut down a drafting operation?

Answer 27

Slowly decrease the engine speed to idle, take the pump out of gear, and allow the pump to drain. After the pump is drained and connections removed, operate the positive displacement primer for several seconds until the primer oil or fluid comes out of the discharge from the priming pump. Flush pump unless using a very clean static water supply