PURPOSE: To prevent stress corrosion crack from occurring at the groove part of a core plate by a structure wherein the height of the outer side wall of the groove part of the core plate, which is engaged with the outward side wall surface of the fitting part of the edge of a tank, and the caulked height of a caulking plate are determined in a specified relationship.
CONSTITUTION: A core plate 16, whose outer periphery edge is formed in an inner and an outer side walls and the groove part 20 with a bottom wall, is fixed on the side wall of a tube 7 or on a tank main body 1 near its upper end along its periphery. The fitting part 10 of the edge of the tank 2 is fitted through an elastic sealing material 21 in the groove part 20. In this case, the height h from the bottom surface 19 of the inside of groove at the groove part 20 of the caulking plate 23 to the upper end of the outer side wall of the groove part 20 and the height H from said bottom surface 19 of the inside of groove at the groove part 20 to the outside application surface, onto which the caulking plate 23 is caulked, of the fitting part 10 of the edge of the tank 2 are set so as to satisfy the relationship of H-h≥0.5mm.
NAKAMURA KISHICHI
IWASAKI SATORU
IZAWA TOSHIHISA
| JP54024155B |