Prior to 2015 no reliable non-destructive test method existed for measuring the collapse pressure of deepwater pipeline joints, which are typically around 12 m (39.3 ft) long. Historically, the industry has favored testing a few specimen joints to destruction, then combining the results with the best available structural design techniques and a substantial safety factor to determine a conservatively safe pipe wall thickness. This approach on several projects led in turn to creation of the best-known design
Source: NDT