Deflection testing has which of the following characteristics?

• A. Deflection tests must be performed only for diameters over 36 inches
• B. Deflection tests are optional
• C. Deflection tests must be performed on all pipe
• D. Deflection testing is prohibited

Answer: (C)

Deflection testing checks how much a pipe has moved or bent at its joints after installation to ensure it stays within the allowable limits. The important idea is that this verification is done for every pipe section, regardless of diameter, so the entire system meets the needed joint integrity and performance. It isn’t optional and it isn’t prohibited, which is why all pipe installations are expected to undergo this test to catch any problems early and prevent leaks or failures down the line.