C-FER has developed a limit states design (LSD) approach to assess corrosion and crack features in onshore transmission pipelines. The LSD approach is a simplified form of the reliability-based approach that reduces the latter to a set of deterministic checks. It achieves the same benefits on an approximate basis and is easy to apply.
The paper—Demonstration of a Limit States Design Method for Assessment of Corrosion and Crack Features—describes the application of the LSD approach to two low vapour pressure liquid pipelines (one with corrosion and one with crack features) and provides a comparison of the LSD approach to another simplified reliability-based approach developed by an operator, the Pipeline Integrity Reliability Analysis (PIRA) Level 1. The differences of the outputs of the two approaches were investigated using a sensitivity analysis on the following input parameters:
- Reliability target,
- Wall thickness distribution,
- Feature depth and length distributions,
- Pipeline sectioning procedure, and
- Usage of model error.
Riski Adianto is presenting the results of this project at the upcoming virtual International Pipeline Conference. The presentation will be available on-demand during the event. You will learn about the application of the LSD approach and how it compares to the PIRA model when assessing corrosion and crack features.
The entire paper—IPC2020-9517 Demonstration of a Limit States Design Method for Assessment of Corrosion and Crack Features—is available through the 2020 International Pipeline Conference.
Riski Adianto is a Research Engineer in C-FER’s Pipeline Integrity and Operations department. His focus is on quantitative risk and reliability analysis of pipelines.