Title:Research on Failure Pressure of API 5L X100 Pipeline with Single Defect
Volume: 17
Issue: 2
Author(s): Zhanhui Wang*, Wenlong Duan, Mengzhao Long, Aimin Wang and Xiaojun Li
Affiliation:
- Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization, Yulin University, Yulin, 719000, China
Keywords:
Single defect, stress cloud diagram, failure pressure, anti-corrosion layer, exactitude, corrosiveness.
Abstract:
Background: With the continuous application of API 5L X100 high-strength
grade steel pipeline and the development trend of increasing pipeline diameter and design
pressure in China's long natural gas and petroleum pipeline, API 5L X100 high-strength
grade steel pipeline steel is bound to become the aorta in long-distance pipeline construction
in the future. Studying the failure pressure of API 5L X100 high-strength grade steel
pipeline has high economic and social benefits.
Objective: Exploring the corrosion mechanism of the two single corroded pipeline models
with outer defect and inner defect.
Methods: Using ANSYS Workbench 15.0 software to explore the two single corroded
pipeline models with outer defect and inner defect and the influence of geometric parameters
such as defect depth, defect length, defect width, etc., on the maximum equivalent
stress and failure pressure investigated. Based on the finite element analysis database, the
failure pressures of two single corroded pipeline models were fitted using Matlab software
and the fitting formulas.
Results: In the corrosion defect area of the pipeline, stress concentration occurs; Far away
from the corrosion defect area, the stress distribution is uniform. For the pipeline model
with outer defect and inner defect, as the defect depth and length increases, failure pressure
shows a decreasing trend and is almost unaffected by defect width; As the ratio of diameter
to thickness increases, failure pressure shows a decreasing trend; By fitting failure pressure
formula of the pipeline models with outer defect and inner defect, a multivariate fitting
function formula of failure pressure is obtained, with high fitting exactitude.
Conclusion: The conclusion obtained have certain guiding values for the normal and stable
operation of natural gas and petroleum transportation pipelines.