FAILURE ANALYSIS AND PARAMETRIC STUDY OF CRACK ON A PIPELINE API 5L X52
Pipeline failures which dominated by cracks and pipe leaks have occurred in the gas pipeline from Teras to West Prabumulih in South Sumatra Province. In 2019, there were four leaks total due to cracks on the pipeline which required initial repairs by using pipe clamps or apply pipe insertion. Theref...
Saved in:
| Main Author: | |
|---|---|
| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/49664 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Pipeline failures which dominated by cracks and pipe leaks have occurred in the gas pipeline from Teras to West Prabumulih in South Sumatra Province. In 2019, there were four leaks total due to cracks on the pipeline which required initial repairs by using pipe clamps or apply pipe insertion. Therefore, failure analysis is carried out to determine the root cause of failure using the fault tree analysis (FTA) method.
In this case study, several analyzes will be carried out to see the allowable depth and length of the crack. Parametric study was carried out by analyzing the maximum depth and length of crack with crack depth varying from 1 mm to 5 mm. The parametric study method uses fitness-for-service (FFS) assessment based on the level 3 assessment procedure of API 579-1 Part 7 and 9 standards by modeling the crack as a semi-ellipticcal on the outer surface of the pipe.
The results of the failure analysis concluded that the cause of failure was hydrogen induced cracking (HIC) that was triggered by potential difference of cathodic protection exceede the standard threshold and the suspected soil settlement around the pipeline. The results of the parametric study found that the maximum allowable crack depth with crack length of 200 mm is 3.4 mm. In addition, the allowable crack length at various depths have been determined by parameterizing the numerical simulation using the ANSYS software.
|
|---|