An evaluation study based on reference data from a Suezmax crude oil tanker has demonstrated the benefits of using Thordon Bearings’ T-BOSS shaftline solution instead of a conventional oil lubricated sterntube system.The
An evaluation study based on reference data from a Suezmax crude oil tanker has demonstrated the benefits of using Thordon Bearings’ T-BOSS shaftline solution instead of a conventional oil lubricated sterntube system.
The study assessed the CAPEX for a sterntubeless T-BOSS (Thordon - Blue Ocean Stern Space) system installed on a 274m (899ft.)-long tanker, assuming a shaft diameter of 670mm (26”) as the baseline. The study established that the T-BOSS provides benefits for ship designers and shipbuilders, including improving shipyard design flexibility with a shorter shaft length, the ability to lower labour and installation costs, and facilitating a more attractive stern arrangement to sell to shipowners through “distinct design wise, operational and lifetime economic benefits."
The study compares all shipbuilding disciplines including sealing systems, piping, structural works, shafting, outfitting, painting, electrical systems, testing, and regulatory aspects. The comparisons demonstrate that labour and installation costs are lower with a T-BOSS system across the board.
The T-BOSS also delivers design flexibility by shortening the propeller shaft, creating up to 660m³ (23,308ft³) of additional cargo space in the Suezmax tanker study. This enables naval architects and shipbuilders to “enhance layout flexibility at the early newbuild design stage,” the study notes. As a result,
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