液压舱盖泵
hydraulic efficiency hatch pump
hydraulicefficiency hatch pump
hydraulic hatch pump
顶盖、底盖、盖板
top cover， bottom cover， and cover board
top cover
bottom cover
and cover board
舱底泵抽布置
bilge pumping arrangements
舱底泵抽与排出
Bilge pumping and drainage
舱底泵出水管
bilge pump discharge pipe