Book 29 Water Utilities Flashcards
Book 29 Water Utilities
Supply systems are gravity or pump or a combination of both.
Gravity systems use a source of water (such as lakes and reservoirs) that is at a higher elevation than a municipality.
pumps are used to supply water at the proper pressure into a distribution system.
The City of Los Angeles uses a combination system to supply an average of 600 million gallons of water per day to 4 million people.
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Book 29 Water Utilities
TRUNK LINES
Trunk lines carry water from a primary source (reservoirs, pumps, etc.) to mains within a distribution system.
Trunk lines can vary from ___ inches to ___ feet in size,
Constructed from iron or concrete.
36
10
Book 29 Water Utilities
MAINS
Mains normally run beneath a street and parallel to a curb, can vary from ___ to ___ inches in size,
Constructed from iron pipe.
2 to 72
Book 29 Water Utilities
SERVICE AND CUSTOMER LINES
Service lines run between a main and a water meter, can vary from ___ inch to ___ inches, and are constructed from iron, copper, or galvanized pipe.
Customer lines run between a water meter and a structure, can vary from ___ inch to ___ inches, and are constructed from iron, copper, galvanized, or plastic pipe.
1⁄2 to 12”
1⁄2 to 12”
Book 29 Water Utilities
Meter Box
The centerpiece or lid normally identifies the type of utility with the word(s) “WATER,” “DWP,” “L.A. Water,” “LA DWP WATER,” or “CITY WATER METER,” and are often marked with blue paint.
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Book 29 Water Utilities
Non-Indicating Valves
These valves do not indicate an open or closed position and are characterized by ball or cone valves and gate valves.
A ball or cone valve has a rectangular valve-nut attachment on the top of the valve. When the valve is closed, the valve-nut is perpendicular to the valve.
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Book 29 Water Utilities
Water meters are normally directly adjacent to shut-off valves and vary in size from ___ to ___ inches
1⁄2 to 10
Book 29 Water Utilities
Compound meters (Low and High flow) are 4 inches or larger and are normally found directly adjacent to shut-off valves.
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Book 29 Water Utilities
Pressure Reducing Valves are normally used in domestic services to reduce high water pressures to an acceptable level inside a structure (i.e., dwellings commonly use ___ to ___ psi).
40 to 80
Book 29 Water Utilities
Most detector check valves will use a small water meter in parallel with the check valve(s) to detect leaks and the unauthorized use of water.
Detector check valves can vary in size from 2 to 10-inches.
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Book 29 Water Utilities
In warm climates, water meters can be placed just below grade level, and pressure reducing valves, shut-off valves, and detector check valves can be located above or below grade level
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Book 29 Water Utilities
SINGLE FAMILY DWELLINGS
1⁄2 to 2 inch single water meter
Water service for a domestic sprinkler system will normally be a 2 inch detector check valve that is located in a separate vault.
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Book 29 Water Utilities
HOTELS
Domestic water and fire protection services are provided by a combination water service that provides domestic water with a 4 to 6 inch water meter and water for fire protection with a 4 to 8 inch detector check valve.
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Book 29 Water Utilities
APARTMENTS
1 to 3 inch customer lines and a single 1 to 3 inch water meter with a shut-off valve on one or both sides of a meter.
Water service for fire protection will vary between 2 to 4 inches.
If a structure has Dorothy Mae Sprinklers, a separate 2 inch fire service vault is used.
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Book 29 Water Utilities
COMMERCIALS
A commercial occupancy with multiple occupancies (such as mini-malls), can be serviced with water for a domestic water service by a single water meter for an entire building or, by multiple, 1 to 2 inch water meters in separate vaults, which can supply each individual occupancy (referred to as a battery).
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