AWWA Technical Standards and Specifications 2

Question 1

According to AWWA C651, what is the required chlorine residual for disinfection of a new water main after the holding period?

Accepted Answer

At least 10 mg/L free chlorine

Answer

AWWA C651 requires a minimum free chlorine residual of 10 mg/L after the specified holding period to confirm adequate disinfection.

Question 2

AWWA Standard C900 covers which type of pipe material for water distribution systems?

Accepted Answer

PVC pressure pipe

Answer

AWWA C900 specifically covers PVC (polyvinyl chloride) pressure pipe for water distribution, typically in sizes 4 through 12 inches.

Question 3

What does the AWWA C110/A21.10 standard govern?

Accepted Answer

Ductile-iron and gray-iron fittings for water service

Answer

AWWA C110/A21.10 establishes dimensions, pressure ratings, and material requirements for ductile-iron and gray-iron fittings used in water service.

Question 4

Under AWWA M11, what is the typical minimum cover depth for steel water transmission mains to protect against damage?

Accepted Answer

36 inches

Answer

AWWA M11 (Steel Pipe Manual) generally recommends a minimum cover of 36 inches for steel transmission mains to provide adequate protection.

Question 5

AWWA C207 provides specifications for which component commonly used in steel pipeline systems?

Accepted Answer

Steel pipe flanges

Answer

AWWA C207 covers the dimensions, materials, and pressure ratings of steel pipe flanges used to connect sections of steel water pipelines.

(AWWA) American Water Works Association Practice Test