L51872 Effects of Pressure Fluctuations on SCC Propagation

The objective of the research summarized in this report was to define the relationship between the nature of pressure fluctuations on gas transmission pipelines and the crack growth behavior under conditions designed to simulate near-neutral pH SCC. The roles ofR ratio, frequency, waveform, (including realistic complicated waveforms) time, and pressure transients on crack-growth behavior were evaluated. The project was divided into three tasks: Task 1 - Test Matrix, Task 2 - Assessment of the Superposition Principle, and Task 3 - Effect of Pressure Transients.