Water Utilities (ch.5) Flashcards
The pressure of water to elevation;
____ psi per foot of elevation
.433psi
The city of LA uses a combination system to supply an average of ______gallons of water per day to ___
million people
600 million gal.
4 million people
Tr u n k l i n e s c a r r y w a t e r f r o m a p r i m a r y s o u r c e ( r e s e r v o i r s , p u m p s , e t c . ) t o m a i n s w i t h i n a
distribution system. Trunk lines can vary from ___ inches to ____feet in size, and are
constructed from iron or concrete
36”to 10’
MAINS
Mains normally run beneath a street and parallel to a curb, can vary from ___to ___inches
in size, and are constructed from iron pipe.
2 to 72in
Service lines run between____
Customer lines run between ____
Service line = between main and water meter
Customer line = between water meter and structure
Building owners are normally responsible for maintenance and repair of: x2
- Plumbing from shut off valve
- All plumbing inside of structure
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 _____paint.
Blue
Indicating Type Valve These valves indicate an open or closed position and are characterized by ______ and ______
outside stem and yoke (OS&Y) valves and post indicator valves (PIV).
Water Meter is used to calculate water usage for a domestic water service. Water
meters are normally directly adjacent to shut-off valves and vary in size from____to _____
inches (inlet-outlet size).
1/2 to 10 in
Used to calculate water usage for domestic water services that can use low and high water flows
Compound meter
Compound meters are ____ inches or larger
4inches
Pressure reducing valves
Dwellings commonly use ___ to ___ psi
40 to 80
SFD
Domestic water services consists of a ___ to __ in single water meter
Apt.’s
Domestic water service consists of _ to _ inch customer line’s
Hotels= ___ to ___ inch water meter
High rise
___ to ___ water meter
*if a structure has dorthy may what size vault?
1/2 to 2 in
1 to 3in
4 to 6inch
4 to 10
*dorthy Mae sprinklers have a separate 2inch fire service vault
Types of sprinkler systems; x 4
Automatic wet pipe system-pipes filled with water,
Automatic dry pipe system-pipes filled w/ air
Non automatic system-dry pipes/fdc required
Deluge system- can be open or closed
Standpipe systems; x2
Dry standpipe -Siamese connection, 2 1/2 in outlets each floor
Wet standpipe- 100’ of 1 1/2” unlined single jacket hose with a 1/2”straight tip with no shut off
When closing a ball, cone, or gate valves that are _____inches or larger, it may be necessary to exercise a valve to completely eliminate the flow of water as valves can become encrusted with rust and scale. When a stubborn cone valve is encountered, slightly loosen the nut on the bottom of the valve (if accessible) and strike the threaded shaft with a hammer. This will drive the shaft into the valve and free the valve. The valve may now be shut off
3inches
Ball valves do not or do have nut on the bottom valve
Do not
What size service line should dip be requested to handle shut off
4” or larger
Depending upon the buildings system a partial system shut down or full system shut down will control the water. Use Sectional shut off or ___ valves
Zone valves
The fire hydrant gate valve is normally found in direct line with the fire hydrant and perpendicular to the curb. A _____ inch diameter cap (usually painted _____) covers access to the gate valve. Some gate valve locations are indicated by arrows etched on the adjacent curb.
6 in
Fire hydrant gate valves may require ___ to ___ full turns
Approximately ___% of all fire hydrant gate valves close in a clockwise direction
18 to 26 turns
98 percent clockwise
When notifying OCDS of a sheared off fire hydrant, include the following:
X3
Hydrant location
If shut off
Number of valves operated
*ocd will notify dwp operating trouble board
Service lines = ____ to ____”
1/2” to 12”
