Chapter 5 Water Supply Flashcards Preview

Fire Officer's Handbook of Tactics 4th edition > Chapter 5 Water Supply > Flashcards

Flashcards in Chapter 5 Water Supply Deck (16)
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1
Q

Pressure good for?

A

Pressure is use for reach and penetration

2
Q

Water volume is good for?

A

Amount of water that is applied to the fire that puts it out not pressure

3
Q

Weight of one cubic foot of water

A

1 cu. ft of water weights 62.5 lbs and this equals 7.5 gallons

4
Q

Physical fact 2 of water

A

The pressure in a confined body of water at REST is the same at all points

5
Q

Head pressure ( column of water 1 ft high exerts a pressure of xxxxx psi at its base)

A

For every foot of height 0.434 psi. ( the weight of one cu. ft. Of water is 62.4 lbs, divided by the number of square inches in the base of 1 cu. ft, 144 equals 0.434

6
Q

Water Pressure increases Xxxx psi for every _________ ft of depth.

A

1 psi. 2.3 ft of depth

7
Q

How much pressure does it take to push a single drop,of water out of the top of an open valve of a standpipe riser located 230ft above the pump?

A

100 psi

8
Q

The most common resistance to flow in hoses is?

A

Friction loss, only a fraction of this loss is actually due to the friction between the water and the inside of the hose

9
Q

Turbulence

A

Turbulence increases as the volume of water increases

10
Q

Laminar flow

A

At low flows, there is almost no turbulence and all the water molecules move along quite smoothly

11
Q

Friction loss occurs along the length of hose

A

If the flows remain constant, the longer the the hose, the greater the friction loss

12
Q

Friction loss and diameter of hose

A

The larger the diameter of hose the less friction loss for the same flow

13
Q

Diameter of hose

A

By increasing the diameter of hose, more water can be delivered farther using the same pump

14
Q

Increasing water

A

Increasing the amount of water flowing through a hose will increase the amount of friction loss, regardless of the diameter of the hose.

15
Q

Water rule 4

A

The pressure in the water main is independent of the shape and volume of the container

16
Q

A pump impeller can do two things:

A

Give a little bit of water a strong push or it can give you a lot of water a little push