High Temperature Hydrogen Attack Inspection

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By signal processing and imaging

Page last modified

April 11 2024

High Temperature Hydrogen Attack (HTHA) is one such form of degradation which is due to the formation of Methane (CH4) by reaction with carbon in steel. HTHA can occur either in the parent material or in the weld itself and manifests itself in several types of alloys.

HTHA can be detected in a number of ways, but the reliability of some of the techniques is questionable. SGS has developed a specific procedure and approach to identify and monitor HTHA adequately. The methodology developed by SGS Industrial combines advances signal processing and imaging of the results, utilizing advanced techniques like Time of Flight Diffraction (TOFD), Automated Backscatter and Velocity Ratio measurements.

Pros & Limitations

Lavender HTHA-certified operators with experience

The inspection has high reliability and reproducibility

It is possible to detect attack at an early stage

The progress of attack can be monitored in time

Clear presentation of results is possible

Examination is non-intrusive, resulting in cost and time savings

All geometries can be examined

All data are stored for easy and quick reference at any time in the future

It is not possible to predict how long the inspection will last. When indications are found, the research will be expanded

Only during shutdowns

Specification

Specification Title	Specification Description
Areas of Application	HTHA could be found in process equipment such as Heat Exchangers, Reactors or pipe-work connected to the equipment.
Capabilities	SGS-operators have more than 20 years of experience in these HTHA inspections, which results in consistent performance and has resulted in enormous costs savings in inspection of the assets.
Certifications / licences	Lavender HTHA ToFD Level III \| Phased Array level III \| Ultrasonic Testing level III
In-service inspection possible	All equipment should be out-of-service.
Preparation	Preparation for the inspection is mandatory (cleaning activities, operational out-of-service aspects).
Procedure	SGS has developed a specific procedure and approach to identify and monitor HTHA adequately.
Reporting	An extensive report of the inspection will be handed over to the client, where substantiated findings are explained. Furthermore, preliminary reports during the inspection will be given.
Techniques	Phased Array \| Time of Flight Diffraction \| Ultrasonic Testing \| Velocity Ratio \| Frequency Spectrum Analysis \| Backscatter