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Zebras > Properties Of Water & Backflow > Flashcards

Properties Of Water & Backflow Flashcards

1
Q

Fire needs how much oxygen to burn

A

15%

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2
Q

Water to steam expands how much

A

1700 times out of

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3
Q

How does a standard sprinkler suppress the fire

A

Soaks/removes fuel

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4
Q

Heat is measured in

A

BTU’s (British thermal units)

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5
Q

Water is composed of 2 gases which are

A

Hydrogen and Oxygen

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6
Q

H2O broken down means

A

2 parts hydrogen, 1 part oxygen

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7
Q

Liquid nitrogen in sprinklers is used too

A

Create ice plugs

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8
Q

Potable means

A

Fit for human consumption

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9
Q

What prevents contamination to supply

A

Backflow

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10
Q

Hardness in water is due too

A

Magnesium or calcium

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11
Q

Hardness in water is measured in

A

PPM or GPG
(parts per million)
(Grains per gallon)

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12
Q

Hydrogen sulphide causes

A

Odours

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13
Q

Iron or magnesium causes

A

Rust or stains

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14
Q

Turbidity causes

A

Cloudiness

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15
Q

Bacteria in water causes

A

Contamination

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16
Q

Specific gravity of water is

A

1

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17
Q

Specific gravity less then 1 means

A

It will float

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18
Q

Specific gravity of more then 1 means

A

It will sink

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19
Q

Atmospheric pressure is

A

14.7 psia

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20
Q

Liquid to a gas temp

A

100C or 212F

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21
Q

Freezing point of water

A

0C or 32F

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22
Q

Water is most dense at

A

4C or 39F

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23
Q

When pressure increases, what happens to the boiling point

A

Also increases

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24
Q

Latent heat of fusion is

A

Water Turing into ice

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25
Q

Latent heat of vaporization is

A

Liquid to a gas

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26
Q

1Ft cubed of water weighs

A

62.4lbs

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27
Q

1 imperial gallon weighs

A

10lbs

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28
Q

How many imperial gallons are in 1Ft cubed of water

A

6.24 gal

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29
Q

1 imperial gallon to ounces is

A

160 ounces

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30
Q

1 US gal to ounces is

A

128 ounces

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31
Q

1 cubic inch of water weighs

A

0.036lbs

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32
Q

US gal to Imp gal conversion

A

x 0.833333

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33
Q

Imp gal to US gal conversion

A

x1.2

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34
Q

Back pressure with backflows is when

A

Reverse in normal direction of flow, caused by system pressure being greater then that in supply line

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35
Q

Back siphonage with back flows is

A

Reversal in normal direction of flow in the pipe line due to negative pressure (vacuum) in the supply line

36
Q

Strainers on back flows should be placed

A

At inlet for back flows

37
Q

Strainers in back flows for fire protection should be eliminated because

A

They cause restriction/could plug up with debris

38
Q

Control valves on back flows are generally

A

OS&Y or butterfly (must be indicating)

39
Q

Relief valve on back flow will operate within

A

2-6 psi increase in intermediate zone
(All are 2 psi minimum)

40
Q

2 kinds of anti freeze that can be used in sprinkler systems are

A

Glycerine or Propylene Glycol

41
Q

Backflows cannot be altered without

A

Contacting manufacturer

42
Q

Intermediate zone is also referred to as

A

Reduced pressure zone

43
Q

Intermediate zone is equipped with

A

Atmospheric vent

44
Q

Water in the intermediate zone during normal flow is how much lower then supply

A

5-11psi

45
Q

What is the pressure inside the Intermediate zone during a static situation

A

5-8 psi lower then supply

46
Q

The relief valve on an RPZ is held closed by

A

Supply pressure

47
Q

Relief valve causes what kind of “trouble signal”

A

Visual

48
Q

What installation feature must you check with the manufacturer about before install

A

Installing vertical

49
Q

The backflow should be installed

A

In an accessible location for testing and servicing

50
Q

The discharge line should never be

A

Hard piped to any drain

51
Q

Relief valve discharge line should be

A

1 foot above the floor

52
Q

Bypass line on Backflow is made up of

A

Water metre, control valve, check valve

53
Q

Backflows require internal inspection every

A

5 years

54
Q

back flow testing (flow test/performance test) how often

A

Annually

55
Q

RPZ should have a visual inspection done how often to see if relief is discharging

A

Weekly

56
Q

Fire department connection height

A

Not less then 18 inches, no more then 4 feet above the level of grade

57
Q

Buildings that do not require an FDC

A

-Remote areas
-Large capacity deluge systems exceeding pumping capacity of FD
- single story buildings not exceeding 2000sqft

58
Q

The check valves are spring loaded to hold

A

Minimum of 1 psi in the direction of flow

59
Q

If the back flow has a meter, what must be done

A

Main check springs must be increased so that they’re greater then the metered bypass to ensure low volume flows will be recorded

60
Q

What must the meter connection have on the backflow

A

Double check valve assembly

61
Q

How many test cocks are there for testing a backflow

A

4

62
Q

What backflow is preferred in he sprinkler industry

A

Double checck

63
Q

Pressure loss in system from using a double check

A

4-6psi

64
Q

RPZ backflow pressure loss to system

A

10-20psi

65
Q

Backflow preventers should be installed about

A

Waist high

66
Q

Fire pumps must be how far from back flows with OS&Y valves

A

10x pipe diameter

67
Q

Fire pumps must be how far from back flows with butterfly valves

A

50 feet

68
Q

Test to measure hardness of water

A

Mix soap in water, more bubbles more hard water is

69
Q

When water freezes how much does it expand

A

10%

70
Q

Water vapour is heavier then

A

Air and oxygen

71
Q

Hazard classes for backflows are

A

Low
Moderate
High
Lethal

72
Q

Which hazard is sprinkler water considered

A

Low hazard

73
Q

What hazard is Antifreeze or foam considered to be

A

High

74
Q

Example of lethal substance that backflow need to protect against

A

Radioactive or raw sewage

75
Q

Backflow kind for low hazard class

A

Double check valve assembly

76
Q

Backflow for moderate to high

A

Reduced pressure zone assembly

77
Q

Lethal hazard class uses what kind of backflow

A

Air gap

78
Q

Air gap must be a minimum of

A

1”, and 2x the diameter of the outlet

79
Q

Spring tension on relief valve has contributes how much pressure

A

3psi

80
Q

DCVA #1 check must hold a minimum of

A

1psi in the direction of flow

81
Q

When a backflow is installed, how often shall a main drain flow test be done

A

Quarterly

82
Q

Typically, how many GPM can each 2-1/2” outlet produce

A

250 gal

83
Q

When water is confined to a vacuum, how low can it boil

A

16C or 60F

84
Q

How many BTU’s to create steam

A

970.3

85
Q

BTU loss to create ice

A

134.4

86
Q

Water supply test for design purposes is good for

A

12 months

87
Q

Why is a 2-1/2” outlet preferred for hydrant flow testing over 4” outlet

A

2-1/2” provides more accurate reading

Zebras (7 decks)

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