*Bk 29 Water Utilities Flashcards
What sizes can a trunk line be?
What are they normally constructed of?
- 36” to 10ft in size (3 to 10ft)
2. Iron or concrete
______ lines normally run beneath a street and parallel to a curb
main
Main lines can be what sizes?
What are they constructed of?
- 2” to 72” (2” to 6ft)
2. Iron pipe
Water is delivered to individual structures by a combination of ______ and ______ lines.
Service and customer
_____ lines run between a main and a water meter
Service
What sizes are service lines?
1/2” to 12”
Service lines can be constructed of what?
Iron, copper or galvanized pipe
_____ lines run between a water meter and a structure
Customer
What sizes can a customer line be?
1/2” to 12”
Customer lines can be constructed of what?
Iron, copper, galvanized or plastic pipe
Who is in charge of maintenance for the water metering device and the shut-off valves on either side of a water metering device?
Water utility companies (dwp)
Who is in charge of maintenance for the plumbing starting from the water meter shutoff valve to the structure?
Building owner
Meter boxes and vaults often have a lid which is painted which color?
Blue
What are the two types of water utility shut off valves?
Non indicating and indicating valves
What are the two types of indicating valves?
- Outside stem and yolk (OS&Y)
2. Post indicating valve (PIV)
What kind of meter is used to calculate water usage for domestic water services that can use low and high water flows?
Compound
_________ are normally used in domestic services to reduce high water pressures to an acceptable level inside a structure
Pressure reducing valves
What water pressures (psi) are commonly found inside a dwelling?
40-80psi
Multiple water meters used to supply individual occupancies in a commercial building is often referred to as a _______.
Battery
A wet standpipe system is designed to be used by who?
The occupants
Ball and cone valves can be identified by the lack or presence of a nut on the bottom of a valve. Which valve has the nut on the bottom?
Cone valve (ball valve does not)
Leaks from commercial toilets can be eliminated by removing a cap over the relief valve and using a slot-head screwdriver to turn the relief valve screw inward or outward?
Outward
For a hot water leak inside a structure, where should you look to shut off the appropriate valve?
Water heater or boiler
What else must be shut off if you shut down a hot water line from a water heater?
Turn off gas/electricity.
Instead of shutting down an entire sprinkler system, what is the name of the valve that can be used to shut down the needed area/floor?
Sectional shutoff or zone valve
When an OS&Y valve is shutoff, is the stem visible or not visible?
Not visible
What size is the hydrant gate valve cap? (Used for shutting down a hydrant)
6 inch diameter cap
Fire hydrant gate valves may require how many full turns to complete a shutdown?
18-26
Approx ____ % of all fire hydrant gate valves close in a clockwise direction.
98%
Per Vol 2:
___% of hydrants will have the street shut off valve located within ___ feet of the hydrant.
80%
15 ft
Per vol 2:
Some hydrant gate valve locations are indicated by ____ on the adjacent curb
Etched arrows
Water utilities, non indicating shut off valves:
A gate valve is a non-rising stem valve that has a _____ valve-nut attachment at the top of the valve stem.
A ball or cone valve has a _____ valve-nut attachment on the top of the valve.
Square
Rectangular
Water meters are normally directly adjacent to shut-off valves and vary in size from ____ to ____ inches (inlet-outlet size)
1/2 to 10”
For a single family dwelling:
Domestic water services will normally consist of a ____ to ____ inch single water meter with shut-off valve on one or both sides of a meter
1/2 to 2”
Apartments:
- Domestic water service will normally consist of ___ to ___ inch customer lines and a single ____ to ____ inch water meter with a shut-off valve on one or both sides of a meter.
- Water service for fire protection willvary between ___ to ___ inches.
- 1 to 3” and 1 to 3”
* 2 to 4”
High rise:
Domestic water and fire protection service is provided by a combination water service that consists of a ___ to ___ inch water meter for domestic water and ____ to ____ inch detector check valves for fire protection in the same vault.
4 to 10”
4 to 12”
Automatic Dry Pipe sprinkler System:
The pipes are filled with _______.
Compressed air
What should you do if a shut-off valve has a sign that reads:
“LIFE SUPPORT MACHINE IN AREA” or “SHUT GATE SYSTEM DIVIDE.”
DO NOT turn these valves off unless appropriate approval is obtained.
________ lines carry water from a primary source (reservoirs, pumps, etc.) to mains within a distribution system
Trunk
