Anastasopoulos, Nassos; Mistras Group Hellas ABEE; Greece
Anastasopoulos, A.; Mistras Group Hellas; Greece
Bollas, K.; Mistras Group Hellas; Greece
Bouchagier, L.; Mistras Group Hellas; Greece
Fousianis, P.; Mistras Group Hellas; Greece
Kastanis, P.; Mistras Group Hellas; Greece
Kourousis, D.; Mistras Group Hellas; Greece
Ladis, I.; Mistras Group Hellas; Greece
Papasalouros, D.; Mistras Group Hellas; Greece
Session: Acoustic Emission 1
Time: 16:40 - 17:00
Advanced NDT techniques have been developed for detection and characterization of critical damage mechanisms in metallic structures in the oil & gas industry, such as chemical/mechanical corrosion, fatigue cracks and hydrogen induced cracking. This paper presents the actual performance of such techniques, for on-stream inspection of pressure vessels in wet H2S service suffering from Hydrogen Induced Cracking (HIC) or Stress Oriented Hydrogen Induced Crack (SOHIC). The different requirements for the inspection of each mechanism HIC/SOHIC, assessment guidelines, relevant codes and monitoring techniques are discussed.
Case studies for the application of TOFD and Phased Array Ultrasonic testing techniques, as well as Acoustic Emission (AE) testing are presented, where rapid inspection, long-term or continuous monitoring is performed on vessels of the oil and gas industry.
The advantages and limitations of each technique for real-life industrial applications are discussed. Specifically, the effect of variation of essential parameters in UT measurements accuracy is presented with examples. Advanced filtering and alarm setup in Acoustic Emission monitoring using the UT data is also presented.
The combined usage and data fusion from Ultrasonic and Acoustic Emission testing for continuous, long-term monitoring is discussed together with the needs and requirements for Fitness for Service for HIC damage.