A mandrel is employed to verify a pipe's ability to resist deformation under standard conditions.

A mandrel is employed to verify a pipe's ability to resist deformation under standard conditions.

• A. Deflection test
• B. Hydrostatic test
• C. Sewer taps
• D. Manhole test

Answer: (A)

A deflection test uses a mandrel to check how well a pipe maintains its round shape under normal loads. The mandrel, a rigid gauge passed through the installed pipe, should move freely without snagging and without the pipe deforming beyond allowable limits. If the mandrel cannot pass or the pipe shows excessive deformation, it indicates the pipe may not resist service loads as intended. This makes the deflection test the right choice for confirming resistance to deformation. Hydrostatic tests focus on leaks, not shape; sewer taps and manhole tests relate to connections and access structures, not the pipe’s deformation resistance.

A deflection test uses a mandrel to check how well a pipe maintains its round shape under normal loads. The mandrel, a rigid gauge passed through the installed pipe, should move freely without snagging and without the pipe deforming beyond allowable limits. If the mandrel cannot pass or the pipe shows excessive deformation, it indicates the pipe may not resist service loads as intended. This makes the deflection test the right choice for confirming resistance to deformation. Hydrostatic tests focus on leaks, not shape; sewer taps and manhole tests relate to connections and access structures, not the pipe’s deformation resistance.