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A provision crane is installed on the stern deck of the ship to load or unload ship supplies. In this study, a ventilation hole capable of circulating internal flow was installed to reduce dew condensation by reducing the temperature difference between the inside and outside of the cylindrical column supporting the provision crane installed at the stern of the training ship. In order to reduce the temperature difference between the inside and the outside, an anti-sweat covering work was carried out by adding insulation material. By reducing dew condensation, we aim to improve the insulation of the electric motor installed inside the cylindrical column and improve the usability of the provision crane