Chapter 10 Operating Fire Pumps

Question 1

What are some feature a paper may have to keep the pump from getting too hot?

Answer 1

Circulator, bypass, or booster cooling valve

Question 2

What might opening the tank fill too fast or all the way do?

Answer 2

It could cause pump cavitation

Question 3

How much psi does the book consider dangerous for your residual pressure?

Answer 3

Below 20 psi

Question 4

Why might hydrants that are interconnected in a grid, that receive water from several directions be a more desirable choice?

Answer 4

They typically have less sedimentation and deterioration

Question 5

Which are the less desirable hydrants?

Answer 5

Those located on dead end mains

Question 6

When might you consider a reverse lay?

Answer 6

When the apparatus must remain close to the water source (drafting or when an increase in hydrant pressure is needed)

Question 7

What do check valves in the tank to pump line do I n some newer model pumpers?

Answer 7

Prevent water from entering the tank under pressure from the pump intake.

Question 8

Does the book day you should or should not close your tank to pump after transitioning to an external water supply?

Answer 8

You should close it

Question 9

What is the static pressure in a water supply system

Why is it important

Answer 9

It is the reading of the pressure on the master intake gauge after the pump is full of water and the pressure in the system has stabilized with no water flowing.

Because it can help estimate the remaining capacity of the hydrant as the water begins to move.

Question 10

What’s some ways the book says you could establish a minimum flow to keep the pump coolwhen the firefighters are shifting water intermittently

Answer 10

Pull the booster line or other small discharge out and shoot it somewhere or even shoot it into the tank to recirculate the water.

Open a discharge drain valve

Partially open the tank full or tank to pump line

Question 11

Static pressure vs. residual pressure

Answer 11

Static: The pressure shown on the intake gauge when a pumper is connected to a hydrant and is not discharging water

Residual: When the pumper is discharging water, the pressure on the intake shows the residual

Question 12

Name the percentage method formul for deterring how much water a hydrant can supply

Answer 12

Percent drop= (static-residual)(100) divided by static

Question 13

Name the additional water available for the different ranges of percentage decreases of the pumper intake pressure:

0-10 percent drop

11-15 percent drop

16-25 percent drop

25+ percent drop

Answer 13

3 times more

2 times more

Same amount

More might be available, but not as much as being delivered

Question 14

The amount of friction loss is proportionate to?

Answer 14

The amount of water moving through it

Question 15

A hose with smaller diameter has higher or lower friction loss than a bigger diameter hose?

Answer 15

Higher friction loss

Question 16

What is atmospheric pressure at sea level?

Answer 16

14.7 psi

Question 17

Most pumps are able to develop a vacuum capacity of approximately how many inches of mercury?

Answer 17

22

Question 18

Define cavitation

Answer 18

Water being discharged faster than it is coming into the pump

Question 19

What is one of the surest indications that a pump is cavitating?

Answer 19

If there is a lack of reaction on the pressure gauge to increase the throttle

Question 20

How many inches of water must you have above your strainer and is a good idea for every other direction as well for drafting

Answer 20

24 inches

Question 21

What can be used to help prevent whirlpools when drafting?

Answer 21

A floating object like a beach ball or capped plastic jug

Question 22

All fire pumps meeting nfpa and underwriters lab inc requirements are rated to pump their capacity at how many feet of lift?

Answer 22

10

Question 23

A pump are in good working order can lift a water a maximum of how many feet?

But to create an effective fire stream a Lyft of no greater than how many feet is recommended?

Answer 23

25’

20’

Question 24

For two-stage pumps which position must the transfer valve be in for drafting?

Answer 24

Parallel or volume position

Question 25

For drafting, how is the vacuum measured?

Answer 25

From the surface of the water to the eye of the pumps impeller

Question 26

When there is no specific information for an FDC to supply a sprinkler system how much psi should the driver operator pump into the FDC

Answer 26

150 psi

Question 27

Where are sprinkler control valve is located

Answer 27

In the fire pump room

Question 28

How much pressure loss loss can be expected for flows exceeding 350 GPM in a standpipe system?

Answer 28

25 psi

Question 29

What does the books say that mini manual standpipe systems are designed to be pumped at, at the FDC?

Answer 29

150 psi