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Quantification and Detection of High Temperature Hydrogen Attack

Project Code: 0901-15


Generate a reliable method and procedure for the detection and quantification of HTHA.

Project Outline

There are two fundamental restrictions to the published techniques. First the quality and cleanliness of the original steel second the sensitivity of the technique. Due to the complexity and reported lack of reliability there has been little take up of the published technique. The published method utilises a normal UT flaw detector with a 0, 5MHz broadband with longitudinal and shear wave transducers.

It is believed that the use of Phased array transducers instead of conventional UT transducers along with the more powerful on board processing will enable a more sophisticated data anlysis method to be applied with enhanced scanning speed but more importantly quantifying and increasing its sensitivity and accuracy. The current systems rely on single point measurements. Using the phased array noise ratio and the volumetric data processing method developed for FSW it is believed that a more stable and reliable method can be developed.

Stage 1 of the project will generate the HTHA samples.

Stage 2 will copy the published technique and quantify its limitations

Stage 3 will apply phased array technology to the basic method and will apply volumetric data processing and analysis to try to stabilise the analysis and provide a reliable inspection method.

The project will require input from metallurgy department at TWI for assessment and generation of the HTHA samples.

Relevant Industry Sectors

Petrochemical industries

Technical and Economic Benefits

Increased safety by timely detection and quantification of attack.

Reduced need and associated cost of intrusive inspection.

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