AWWA Pipeline Integrity and Testing 4

Question 1

What does AWWA's Pipeline Assessment Certification Program (PACP-equivalent for water) focus on when rating pipe condition?

Accepted Answer

Structural and operational defects observed during internal inspection

Answer

Condition assessment programs rate observed defects—such as cracks, corrosion, joint failures, and infiltration—to score pipeline structural and operational integrity.

Question 2

Which type of pipe joint is most prone to leakage in older cast iron mains and is commonly identified during pressure testing?

Accepted Answer

Lead-caulked bell-and-spigot joints

Answer

Old lead-caulked bell-and-spigot joints in cast iron mains deteriorate over time and are a common source of leakage revealed during pressure testing.

Question 3

A utility is evaluating a 60-year-old asbestos cement (AC) main for replacement. Which risk factor is most unique to AC pipe compared to other pipe materials?

Accepted Answer

Release of asbestos fibers into the water if the pipe degrades

Answer

Aging or mechanically disturbed AC pipe can release asbestos fibers into the water supply, creating a distinct public health risk not associated with ductile iron or PVC pipe.

Question 4

What is the term for a pressure wave that travels through a pipeline when flow is rapidly stopped or started?

Accepted Answer

Surge or water hammer

Answer

Water hammer (surge) is the rapid pressure wave generated by sudden velocity changes, which can stress joints and pipe walls and cause failures if uncontrolled.

Question 5

During a pressure test, a contractor purges air from the line before pressurizing. Why is complete air removal critical?

Accepted Answer

Trapped air is compressible and can mask true leakage or cause sudden pressure spikes

Answer

Compressed air in the test section stores energy that can produce misleading pressure readings and pose a safety hazard if a joint fails explosively.

(AWWA) American Water Works Association Practice Test

(AWWA) American Water Works Association Practice Test

AWWA Pipeline Integrity and Testing 4