be considered adj. 被认为怎么样,主动句是consider sb./sth. + adj.
One bilge suction may be considered sufficient (provided that)=if it is capable of completely draining the relevant compartment
One bilge suction may be considered sufficient provided, that if it is capable of completely draining the relevant compartment
舱底水吸口或许要充分考虑到,是否能够完全吸光相关的舱室。