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Engineers Test Exam 11 > Book 29 Water utilities > Flashcards

Book 29 Water utilities Flashcards

1
Q

Gravity Systems

A

use a source of water such as a lake or reservoirs that is at a higher elevation than a municipality

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2
Q

A height of 100 feet will create a pressure of ___

A

43 psi

.433 psi per foot of elevation

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3
Q

Pump systems

A

when a source of water is below or at the same elevation as a municipality or cannot naturally provide sufficient pressure through adequate elevation.

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4
Q

Los Angeles uses a combination system to an average of _____

A

600 million gallons of water per day to 4 million people

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5
Q

Percentage of water from the Sierra Nevada?

A

75%

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6
Q

Percentage of water from wells within the San Fernando Valley?

A

15%

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7
Q

Percentage of water from the Metropolitan Water District which supplies water from the colorado river and state water project (Sacramento and Feather rivers)

A

10%

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8
Q

Trunk lines carry water from a ______.

A

primary source to mains within a distribution system

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9
Q

Trunk lines can vary from ____? and are constructed from?

A

36 inches to 10 feet in size and are constructed from iron or concrete.

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10
Q

Mains normal run beneath a street and parallel to a curb and can vary from ______ and are constructed from ____?

A

2 to 72 inches in size and are constructed from iron pipe.

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11
Q

Mains can be _____ to from loops that allow shutting down a specific main for repairs

A

cross connected.

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12
Q

Water is deliver to individual structures by a combination of ______ and _____ lines

A

service and customer

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13
Q

Service lines run between a _____ and a _____

A

a main and a water meter.

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14
Q

Service line can vary from _____ and are constructed from _____

A

1/2” to 12” inches and are constructed from iron, copper, galvanized or plastic pipe.

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15
Q

Water ultility companies are normally responsible for maintenance and repair of

A

water metering device and shut off valves on either side of a water metering device.

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16
Q

Building owners are normally responsible for

A

plumbing from the shut-off valve and into a structure.

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17
Q

Water service systems are comprised of 4 components:

A

shut off valves, water meters and detector check valves and a pressure reducing valves.

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18
Q

A meter box, vault or manhole often has a centerpiece or lid with a hole that can be utilized to remove the cover. The centerpiece identifies the type of utility with the words?

A

WATER/ DWP/ LA Water/ LA DWP WATER or CITY WATER METER

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19
Q

The centerpiece or lid is often marked with _____ paint

A

Blue

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20
Q

Non-indicating valves. These valves do not indicated __________ and are characterized by a ______.

A

an open or closed position and characterized by a ball or cone valves and gates.

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21
Q

A ball or cone valve has a ________. When the valve is closed, the valve nut is _____ to the valve.

A

rectangular valve nut attachment / perpendicular

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22
Q

Indicating type valve.

These valves indicate an open or closed position and are characterized by ___

A

outside stem and yoke (OS&Y) valves and Post indicator valves (PIV)

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23
Q

Water meters are used to

A

calculate water usage.

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24
Q

Check valves are utilized to allow the flow of water in ______

A

one direction only.

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25
Q

Water meters vary in sizes from

A

1/2” to 10” inches

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26
Q

Compound Meter is used to

A

calculate water usage for domestic water services that can use low and high water flows.

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27
Q

During low water flows, a compound meter operates as a

A

standard water meter

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28
Q

If high flows are necessary with compound meters, a check valve ______

A

opens are allows the passage of large flows that are metered separately

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29
Q

Compound meters are _____ and are normally found directly _____ to shut off valves

A

4 inches / adjacent

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30
Q

Detector Check Valve with By-pass meter is used

A

to supply water for a closed fire protection system.

31
Q

Detector Check Valve with By-pass meter. In the closed position, the check valve

A

prevents water from flowing back into a water distribution system.

32
Q

Detector check valves can vary in size from ____

A

2” to 10” inches

33
Q

In warm climates, water meters can be place just ____, and pressure reduction valves, shut off vales and detector check valves can be located ______.

A

below grade level / Above or below grade level.

34
Q

Domestic water services will normally consist of a ______

A

1/2 to 2” single water meter with shut-off valve on one or both sides of a meter.

35
Q

Water service for a domestic sprinkler system will normally by a ____ that is located in a ____

A

2” detector check valve / located in a separate vault.

36
Q

Hotels: domestic water and fire protection services are provided by a combination water service that provides domestic water with a ______and water for fire protection with a _____

A

4” to 6” inch water meter / 4” to 8” detector check valve.

37
Q

Hotels: The water meter and detector check valves can be in the _____

A

same vault, separate vaults or above ground.

38
Q

Apartments: Domestic water will normally consist of _______ and _______ with a shut off valve on one or both sides of the meter

A

1” to 3” inch customer lines and a single 1” to 3” water meter

39
Q

Apartments: Water service for fire protection will vary between ______

A

2” to 4” inches

40
Q

Apartments: Water services for domestic water and fire protection are in ______

A

separate below ground values or located above ground.

41
Q

Apartments: a common alternative to a single 1” to 3” water meter is a _____

A

3” equivalent water service

42
Q

Apartments: system consist of

A

two 2” inch water meters in adjacent vaults that are connected by a single 3” inch customer line.

43
Q

Apartments: If a structure has Dorothy Mae Sprinklers…

A

a separate 2” inch fire service vault is used.

44
Q

Commercials: Water services are not primarily based on the size of a structure but will depend of the ____

A

water requirements of a structure.

45
Q

Commercials: a commerical occupancy with multiple occupancies can be serviced with water for a domestic water service by a ______ for an entire building or by mulitiple, ______ which can supply each individual occupancy

A

by a single water meter / 1” to 2” inch water meters in separate vaults.

46
Q

Commercials: _____ water meter for domestic water service and ____ detector check valves for protection in separate vaults.

A

1” to 2” inch water meter for domestic and 2” to 4” inch detector check valves

47
Q

Commercials: Combination water service with a _____ water meter for domestic water and _____ detector check valves for fire protection in the same vault. This is used for large water volumes

A

4” to 8” / 4” to 10”

48
Q

High Rise: Domestic water and fire protection service is provided by a combination water service that consist of a _______ for domestic and a _____ detector check vales for fire protection in the same vault.

A

4” to 10” inch water meter and a 4” to 12” inch detector check valves.

49
Q

Automatic dry pipe system. The pipes are filled with ____

A

compressed air.

50
Q

Sprinkler systems are supplied by a (4)

A

gravity tank, pressure tank, automatic fire pump or a water service system.

51
Q

4 Sprinkler systems

A

Automatic Wet, Automatic Dry, Non-Automatic system, Deluge System

52
Q

Non-automatic system: the pipe are ____. To charge this system with water, it is necessary for FD to _____

A

maintained dry / FD apparatus to pump into the FDC to supply water to activated heads.

53
Q

Deluge system: Sprinklers may be ____ and supplied with water by _____

A

open or closed / a heat actuated valve.

54
Q

Wet standpipes: designed for occupant use and consists of ____

A

100’ of 1 1/2” unlined singled jacketed hose with 1/2” straight tip with no shut off.

55
Q

When closing a ball, cone, or gate valves that are____, it may be necessary to exercise a valve to completely eliminate the flow of water as valves can be come encrusted with _____

A

3 inches or larger /

rust and scale.

56
Q

When a stubborn cove valve is encountered, slightly loosen the nut on the bottom of the valve (if accessible) and strike the threaded shaft with a _. This will drive the shaft into the valve and free the valve.

A

hammer

57
Q

Ball and cone valves can identified by the lack or presences of a ____ on the bottom of the valve.

A

Nut / Cone valves do.

58
Q

Shutting off water to 3/4” to 1” service:

A

turning valves 90 degrees will eliminate the flow of water.

59
Q

Shutting off water to 1” to 3” inch equilvant service:

A

A shut off valve is normally located on both sides of a water meter.

60
Q

Shutting off water to 4” inch and larger:

A

Gate valves are located on both sides of a water meter. May be necessary to exercise a valve to completely eliminate the flow off water.

61
Q

Shutting off water to 4” inch and larger:

A

Large above ground or underground installations may consist of back flow valves that are inline with the water meter and multiple OS&Y or age vales. Normally DWP should be requested to handle these.

62
Q

Toilets: in residential can be shut off at the _____ at the wall near the toilet.

A

Angle valve.

63
Q

Toilets in commercials: remove a _____ over the relief valve and using a _____ to turn the relief valve screw outward.

A

cap / a slot head screwdriver

64
Q

Urinals?

A

same as toilets

65
Q

Hot water leaks can normally by eliminated by shutting off the appropriate valve at the water heat or boiler. However remember to ____ to the heater to prevent a possible rupture due to the expanding water in the heater

A

shut off the gas or electricity to the heater.

66
Q

Fire protection services:
Sectional shut off or zone valves. Sprinklers can be controlled by using _____. Look for sectional shut off or zone valves instead of shutting off the whole system. This is cause less disruption of the system and speed up the drinking process.

A

appropriate sprinkler shut-off tool.

67
Q

Fire protection services: 2” service. A shut off valve is normally located adjacent to a detector check valve. Turning this valve ____ will eliminate the flow of water past this service.

A

90 degrees.

68
Q

Fire protection services: 4” or larger service: turn valve in ____ to close valve. The valve will visually indicate the position of the valve by an arrow or display which states _____

A

Clockwise direction / “OPEN” or “SHUT”

69
Q

Fire protection services: OS&Y valves are turned _______ so the stem is _____ to stop the flow of water.

A

clockwise so the stem is not visible.

70
Q

Sheared Hydrant: a fire hydrant gate valve is normally found in ______ with the fire hydrant and perpendicular to the curb.

A

direct line

71
Q

Sheared hydrant:

A ____ cap usually painted ____ covers access to the gate valve.

A

six inch diameter usually painted blue

72
Q

Sheared hydrant: Some gate valve locations are indicated by ____ etched on the _____ curb.

A

Arrow / adjacent

73
Q

Fire hydrant gate valve may require _____ to complete a shut down

A

18-26 full turns

74
Q

_____ % of all fire hydrant gate valves close in a clockwise direction

A

98%

Engineers Test Exam 11 (11 decks)

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