Nonlinear Ultrasonic Nondestructive Evaluation Method for Natural Aging Degree of Buried Medium Density Polyethylene Gas Pipeline During Long‐Term Service
Nonlinear ultrasonic testing measures aging performance in medium-density polyethylene gas pipelines, suggesting reliable methods for evaluating thermal degradation.
Key Points
Nonlinear ultrasonic testing effectively assesses the aging degree of gas pipelines, improving evaluation methods.
The average relative errors of 4.8% and 4.1% were found when comparing nonlinear coefficients with oxidation induction time and tensile strength.
This study conducted tests on seven types of PE80 pipelines, establishing a comprehensive model of aging performance across three distinct stages.
After 19 years in service, the oxidation induction time and tensile strength were significantly above national standard values, confirming improved longevity.