Water Systems

Question 1

Means of moving water in municipal water systems

Answer 1

Gravity
Direct Pumping
Combination

Question 2

Hydrant supply mains in residential areas recommended size

Answer 2

6 in diameter closely gridded by 8 in cross connecting mains no more than 600’ apart

Question 3

Hydrant supply mains in business and industrial areas minimum recommended size

Answer 3

8 in every 600’

Question 4

Major cities may have water mains as large as

Answer 4

48”

Question 5

Circulating feed hydrants (looped line)

Answer 5

A fire hydrant that receives water from two or more directions

Question 6

Dead end hydrants

Answer 6

A fire hydrant that receives water from only one direction
prominent in north Tustin 4” dead end mains only capable of 200 gpm flow

Question 7

Rotations required on a wet barrel hydrant valve stem

Answer 7

10-15

Question 8

Required rotations to fully open a dry barrel hydrant valve stem

Answer 8

25 rotations

Question 9

GPM expected when sitting on the plug with pony line

Answer 9

2 1/2” supply +/- 450 GPM
4” supply +/- 1500