The stern tube will not only support the weight of the shafting and propeller but prevent the sea water outside the hull from comingn as well. For the fore end of stern tube is connected either with the shaft tunnel or the engine room, while the rear end is in contact with sea water. Therefore, both

For stern tube sealing a choice can be made between stuffing box and oil-resistant rubber sealing ring.

The installation of the shafting really needs a pain-taking work, which is usually carried out by the machinery workshop of a yard. One of the key processes is the alignment of the shaft system, and the nofollowing requirements for the alignment must first be met with.

(1)All the fabrication, welding and hot work for the calibration below the upper deck to be completed. In addition, the fabrication, welding and hot work for the seats of main engines, gearboxes, bearings and the like above the inner bottom are to come to an end fundamentally.

(2)The tightness test to be fulfilled for M. E. and aux. engine rooms as well as for all the compartments after M. E. and aux. engine rooms, apart from the test in way of the shafting arrangement.

(3)The hull should rest on a berth or a slipway in a nonrestrictive state, with any grounded support at stern removed.

(4)Fore and aft base points situated at the shafting centreline are to be established and approved.

(5)No permission is to be given to the ship deviation or to the lifting of large equipment during the whole period of time from the alignment until the completion of the stern tube installation.

(6)The shafting alignment process is not to be carried out in uncertain weather or under a direct exposure to a blazing sun. Besides, the above alignment will be accomplished either by a steel wire or by an optical projector.

 

 

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