Which type of defects must pipe, tubing, and fittings be free from?

In the context of pipe, tubing, and fittings, it is crucial that these components are free from structural defects. Structural defects can significantly compromise the integrity and performance of the materials when under stress or in service conditions. Such defects may include issues like cracks, voids, misalignments, or weakness in the material that can lead to failure during operation.

While visual defects, manufacturing defects, and other forms of imperfections may be relevant in the assessment of quality, the most critical concern is ensuring that the structural integrity of the pipe, tubing, and fittings is intact. Structural defects can lead to leaks, bursts, or complete breakdown of the system, making them a priority to eliminate in any quality control process. Therefore, focusing on structural defects ensures the safety and reliability of piping systems in various applications.