Which test would you conduct to check for pipe deflection and joint offset?

The correct choice is to conduct a mandrill test to check for pipe deflection and joint offset. A mandrill is a specialized device used to ensure that the alignment of the pipes is correct and to measure any deflection or offset of the joints. This test is particularly effective because it can highlight any changes in the shape or line of the pipe, which can indicate problems such as sagging or misalignment. The mandrill’s ability to provide precise measurements helps in verifying that the installation meets the engineering requirements and operational standards.

In contrast, smoke testing is generally used for detecting leaks in sewer systems by introducing smoke into the system and observing where it emerges, which is not specifically focused on the structural integrity of the piping itself. Air testing involves pressurizing pipes to check for leaks but does not provide information about joint offset or deflection. Water testing is used to verify the watertightness of sewer systems but is also not designed to assess the physical deformation of the pipes. Thus, the mandrill test is the most appropriate choice for the intended purpose of assessing pipe condition for deflection and offset.