High-temperature hydrogen attack occurs in steels that operate above a certain pressure and temperature in a hydrogen environment.
High temperature hydrogen attack (HTHA) is a phenomenon which occurs within some industrial processes when the presence of hydrogen, subjected to high temperature and pressure, makes plants and systems prone to damage. This reaction can cause an industrial plant to suffer serious failure, which may lead to both expensive repairs and loss of production.
HTHA can be detected in a number of ways, but it is considered that with the complexity of HTHA a more structured approach is necessary. A series of procedures have been developed containing the latest advances in ultrasonic imaging and data processing techniques in order to achieve a greater level of confidence in both HTHA inspection results and inspection repeat-ability.
At AMCO Integrity Pty Ltd with a full understanding of both the phenomena and the methods to assess it, we feel our HTHA service will help minimise your risk. Our experienced team and consultants are able to efficiently evaluate the presence of hydrogen damage to prevent failure of critical plant equipment. The information recorded can be later on analysed allowing fitness for service calculations or condition assessment.
The Nelson curves are the set of graphs that have been widely used to delineate the safe operating conditions. Recent reports have found several incidents where HTHA occurred in the ‘safe’ region of the Nelson curves. In light of these findings, many companies are reexamining their approach to HTHA detection and analysis.
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From a metallurgical point-of-view, high-temperature hydrogen attack (HTHA) is a incredible example of the mobility and power of tiny hydrogen particles in steel structures. HTHA can have serious consequences and has recently been cited in a number of dangerous failures, including several fatalities. The difficulty of HTHA is that it hides from most traditional inspection techniques until significant damage has occurred.
Our team includes hydrogen experts with skill at finding and evaluating the effects of HTHA.