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Fire Service Hydraulics and Water Supply 2nd Edition > Chapter 5: Water Flow Analysis > Flashcards

Chapter 5: Water Flow Analysis Flashcards

1
Q

The only truly reliable method for determining the amount of available flow at any chosen point in the system is to:
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

Perform water flow analysis testing at that point

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2
Q

Flow tests should be done at least every __ years, as well as after any extensive water main improvements or extensions have been made?
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

5 years

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3
Q

Whose responsibility is it to test private hydrants?

[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

The owner’s responsibility

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4
Q

Who often specifies the frequency and extent of the tests to be done to private hydrant?
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

Insurance providers

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5
Q

Static pressure gauges used for water system testing should be capable of measuring at least ___ psi?
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

200 psi

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6
Q

A pitot tube and gauge (or just pitot gauge) measures the:

[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

Stream’s velocity pressure

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7
Q

Pitot gauges used for water systems testing should be capable of measuring at least ___ psi?
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

200 psi

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8
Q

When using a pitot gauge, the small opening or point should be ______ in the stream?
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

Centered

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9
Q

When using a pitot gauge, the small opening or point should be held away from the butt or nozzle at a distance of approximately:
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

1/2 the diameter of the opening

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10
Q

When using a pitot gauge, keeping the air chamber in this position will help avoid needle fluctuations?
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

Above the horizontal plane

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11
Q

When using a pitot gauge, if the needle is fluctuating, what value should be recorded?
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

The value halfway between the high and low extremes

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12
Q

What device can be placed on a hydrant during testing to avoid damages to landscaping?
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

A water stream diffuser

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13
Q

Water flow tests are also commonly referred to as:

[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

Fire flow tests

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14
Q

Before a fire department conducts a flow test, it should notify:
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

The responsible water department official

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15
Q

To avoid liability associated with testing private water systems, who should accompany the fire department when conducting the test?
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

The owner or representative of the water system

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16
Q

What is the required distance from the bottom of the butt of a hydrant to the grade?
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

At least 15 inches

17
Q

Before beginning a flow test, personnel should:

[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

Inspect the condition of the hydrants they are using for the test

18
Q

The least amount of fire hydrants needed to perform a proper water supply test and their given names are:
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

At least 2, The test hydrant, and the flow hydrant(s)

19
Q

No water is discharged from this hydrant during a water supply test?
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

The test hydrant

20
Q

The test hydrant must be located between the:

[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

Flow hydrant and the water source

21
Q

What sized outlets should be used to perform a flow test?

[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

The 2 1/2” discharges

22
Q

Use a ruler with a scale that measures to at least _________ of an inch to determine the actual diameter of the outlet or nozzle opening.
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

Sixteenth of an inch

23
Q

When testing flow, residual pressure should never drop below ___ psi?
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

20 psi

24
Q

Why shouldn’t we use the large discharge when flow testing a hydrant?
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

Because it contains voids. The stream is not solid

25
Q

How do you determine how many flow hydrants should be opened during a flow test?
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

Open enough hydrants to drop the static pressure of the test hydrant by at least 10 percent

26
Q

To get more accurate results for flow testing, the static pressure drop at the test hydrant should be as close to ___ percent?
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

25 percent

27
Q

What can you do if while doing a flow test, the pressure of the hydrant is so low that no flow registers on the pitot gauge?
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

Place a straight-stream nozzle with orifices smaller than 2 1/2” on the hydrant outlet to increase the flow flow velocity

28
Q

Flow test conducted next to elevated storage tanks should be tested:
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

With the storage tank shut off

29
Q

When computing flow test results, there are 2 calculations that must be performed. They are:
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A
  1. Involves determining the flow volume from the flow hydrant
  2. Involves plotting all the given info on a chart to determine the available flow at the test hydrant
30
Q

The internal diameter of a hydrants discharges can vary by a couple of _________ of an inch one way or the other from the stated size?
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

Sixteenth of an inch

31
Q

Many state health departments require water supply systems to maintain ___ psi minimum to prevent the possibility of external water being drawn into the system at main connections?
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

20 psi

32
Q

Most fire department pumper operating manuals recommend that intake pressures on the pump during hydrant operations not be allowed to drop below ___ psi?
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

20 psi

33
Q

The method of manual calculation most commonly used to determine available water flow is the:
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

Graphical method

34
Q

Mathematical calculation used to determine available water flow uses a variation of the:
[Fire Service Hydraulics and Water Supply: Chapter 5: Water Flow Analysis]

A

Hazen-Williams formula

Fire Service Hydraulics and Water Supply 2nd Edition (10 decks)

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