Hundreds of pressure tests are performed daily in the industry with positive results. But the question that always arises is whether the application of pressure and the corresponding stresses have caused any damage to the tested components.

And it's a question that will always remain unanswered.

By using the acoustic emission method in conjunction with pressure tests, it is possible to detect, locate and investigate internal diacontinuities with structurally significant characteristics. Based on ASME section V article 12 and ASTM E1419 we can develope a procedure to do this examination.

The objective of this article is to present to the NDT community, the acoustic emission tool, as a strong complement to pressure testing

In the physical test, various pressure tests were performed on a pressure vessel, with the purpose of monitoring the behavior during design pressure, test pressure, yield pressure and finally burst pressure in order to present correlation graphs and statistics that will be helpful to future users of the method.

In the case of coastal bridges or irrigation water storage tanks using PC structures, if cracks occur due to overload, the PC steel wire may be corroded or structural members may be damaged by the surrounding environment, which may affect the safety of the entire structure Therefore, in this study, the self-repairing system used for RC structures was applied to PC structures to realize a sustainable structure. The recovery of bending strength by self-repairing was confirmed by nondestructive testing, indicating that the self-repairing system is also effective for PC concrete beams.

In recent years, the deterioration of steel structures and reinforced concrete structures such as poles and signposts has been progressing and then it leads to collapse structures without warning due to corrosion of steel and rebar in embedded region. Reinforced concrete (RC) poles have been deteriorating due to factors such as water stagnation at the base and salt damage over long-term use which leads to corrode the rebars in RC structures, which poses a risk of causing the third-party damage. As the corrosion of rebars occurring within these structures is covered by soil and concrete, it makes difficult to detect corrosion product during the standard five-year inspection cycle.
In this study, authors developed the evaluation system for the characteristics of corrosion on rebars for reinforced concrete structures due to the electromagnetic induction with non-destructive and non-contact. In the proposed system, the temperature on the concrete surface varing due to the heat diffusion from the rebars was measured by using the infrared thermography and then the characteristics of corrosion of the rebars was estimated due to the degree of the varing temperature on the concrete surface. Namely, as the corrosion product plays a role as the adiabatic material, the temperature on the concrete surface in the state of the existence of the corrosion product is lower than that in the state of the non existence of the corrosion pruduct.
Secondary, applying the proposed system to a simplified reinforced concrete column, the applicability of the proposed system to the embedded region of the column was discussed. An experimental procedure was used to investigate the presence or absence of corrosion degradation on the rebars within the underground region.

Hydrogen electric vehicles (FCEVs) are rapidly expanding as a key solution for clean mobility, increasing the need for safe and reliable high-pressure hydrogen storage systems. Type IV composite tanks, commonly used in commercial FCEVs, operate at pressures up to 700 bar, where micro-cracks, delamination, or impact-induced damage can lead to serious safety concerns. Ensuring their structural integrity requires advanced nondestructive testing (NDT) capable of detecting defects across multilayer composite structures.
This study presents a novel NDT technique that enables simultaneous inspection of the inner and outer surfaces of Type IV hydrogen storage vessels. The method overcomes limitations of existing inspections by providing comprehensive, non-intrusive evaluation without disassembly. To validate its practical applicability, the technology was applied to in-service hydrogen storage tanks, and its performance was confirmed through real testing. The results demonstrate strong feasibility for technical commercialization and indicate that this dual-sided inspection approach can significantly strengthen safety assurance for hydrogen storage systems. This work contributes to advancing inspection technologies essential for the wider adoption and public acceptance of hydrogen mobility.