Structural health monitoring using acoustic emission on metallic components in industrial plants

Lackner, Gerald; TÜV AUSTRIA SERVICES GMBH; Austria

Lackner, G.; TÜV AUSTRIA; Austria
Marihart, H.; TÜV AUSTRIA; Austria
Posch, M.; TÜV AUSTRIA; Austria
Schauritsch, G.; TÜV AUSTRIA; Austria
Schwald, C.; TÜV AUSTRIA; Austria

ID: ECNDT-0179-2018
Session: Structural Health Monitoring 1
Room: H1
Date: 2018-06-12
Time: 14:10 - 14:30

Structural health monitoring (SHM) is a method to safeguard the integrity of metallic components or component assemblies during service. This process involves a continuous or periodic measurement, the extraction or selection of degradation-relevant data and the statistical analysis to determine the actual state of the system condition. Acoustic emission (AE) monitoring detects and locates potential defects in plant components like piping and pressure vessels. An essential advantage of acoustic emission is that it allows assessing the components regarding evolving defects, leaks or even active corrosion during operation. Therefore, acoustic emission qualifies excellently as a tool for structural health monitoring.
The sensors of the monitoring system have to be mounted at preselected positions of the metallic structure and a tailored data analysis programme evaluates the incoming signals to provide a reliable statement regarding the structural health. Individually designed alarm and warning criteria enable corrective actions to prevent that the observed degradation evolves to failure.
In order to meet the requirements of customers from the oil and gas industry or the energy generation industry, TÜV AUSTRIA developed a monitoring technique for hot and cold surfaces including a methodology for collecting, transferring, storing and evaluating the measuring data.
This paper contains case studies where structural health monitoring with acoustic emission is used to provide an alternative to the regular requalification procedure of the monitored metallic pressure equipment.