After approximately two years of operation, scale accumulated in the gap between the plates and gaskets, causing corrosion to progress. Eventually, through-wall cracking occurred, resulting in external leakage.
This issue can be prevented by changing materials, improving water quality, and performing regular cleaning.

In this case, external leakage occurred due to minute deformation of plates that had been used over a long period, even though the gaskets were regularly replaced.
Saltwater leakage also caused corrosion and wall thinning of the frame.
To prevent such issues, it is effective to periodically inspect and replace not only the gaskets but also the plates.

In this case, fine silica sand contained in the circulating water caused erosion of the plates, leading to through-wall cracking in a short period of time.
Wear caused by foreign matter is difficult to detect, making countermeasures such as installing strainers essential.

In this case, after 11 months of operation, the gaskets were thermally degraded by high-temperature steam condensate, becoming hardened and thinned. As a result, sealing performance deteriorated, leading to external leakage.
Since thermal degradation of gaskets inevitably progresses, regular replacement is essential.

This is a case of so-called 'cold leakage,' in which no leakage occurs during operation but leakage appears only after shutdown. The cause is that gaskets, which expand at high temperatures, shrinkage during cooling, loosening the seal.As thermal degradation also progresses, regular replacement of the gaskets is necessary.