To provide a drainage structure of a ballast tank in which the drainage time of residual ballast water is not significantly lengthened even if the number of communication holes and their opening areas are reduced.SOLUTION: The total opening area of multiple vertical frame members 17, multiple girder members 11, and multiple communication holes 25 provided in each part of multiple floor members 13 facing each small partition chamber 19 included in 3 or 4 rows of small partition chambers 20Wa-20Wd in the ship width direction, decreases away from the small partition chamber provided with a suction port 21 centered thereon in multiple small partition chambers in a prescribed region centered on the small partition chamber provided with the suction port. The communication hole 25L is not provided in each part of the girder members and the vertical frame members facing a part or all of the small partition chambers among the multiple small partition chambers in the small partition chamber rows in the ship width direction, which are a part or all of the small partition chamber rows 20Wf-20Wh in the ship width direction except for the small partition chamber rows 20Wa-20Wd in the ship width direction.SELECTED DRAWING: Figure 2
【課題】通水孔の数及び開口面積を減らしても、残留バラスト水の排水時間が著しく長くならないバラストタンクの排水構造を提供する。【解決手段】3列または4列の船幅方向小区画室列20Wa~20Wd中に含まれる複数の小区画室19にそれぞれ面する複数の縦フレーム材17及び複数のガーダ材11並びに複数のフロア材13の各部分に設けられる複数の通水孔25の合計開口面積は、吸込口21が設けられた小区画室を中心にして所定の領域内の複数の小区画室においては、吸込口が設けられた小区画室を中心にしてこの小区画室から離れるに従って小さくなり、船幅方向小区画室列20Wa~20Wd以外の船幅方向小区画室列20Wf~20Whの一部または全部の船幅方向小区画室列の複数の小区画室の一部または全部の小区画室に面するガーダ材及び縦フレーム材の各部分には、通水孔25Lが設けられていない。【選択図】図2
DRAINAGE STRUCTURE OF BALLAST TANK
バラストタンクの排水構造
2023-05-26
Patent
Electronic Resource
Japanese
IPC: | B63B Schiffe oder sonstige Wasserfahrzeuge , SHIPS OR OTHER WATERBORNE VESSELS |