Water Utilities Flashcards
Trunk water lines vary from what sizes?
3’-10’
Water mains vary from what sizes?
2”-72”
Service and customer water lines can vary from what sizes?
.5”-12”
Pressure reducing valves for domestic services regulate pressure between what psi?
40-80
What is the sizes of water lines for single family dwellings?
Hotels?
Apartments?
.5”-2”
Hotels- 4-6”
Apartments- 1-3”
If you encounter a shut off valve with a sign saying “life support machine in area” or “shut gate system divide” what do you do?
DO NOT shut off the valve
What percent of hydrant shut off valves turn off in the clockwise direction?
98%
Where does Los Angeles get there water?
75% from sierra nevadas
15% wells in San Fernando valley
10% metropolitan water district
What are the two types of water shut offs?
Indicating valves
Non-indicating valves
What size can water meters be?
1/2” to 10” on inlet side
What is a compound water meter used for?
Metering high flows. Meters are 4” or larger
What size are detector check valves?
2”-10”
Fire hydrant gate valves require how many turns to be shut down?
18-26 turns
Valves over what size may need to be exercised to completely eliminate the flow of water?
3” and larger
