Trim optimization LPG tanker business case

By: Jeroen Berger, July 15, 2017

An optimal trim under all conditions provides considerable savings in fuel costs. Exmar, a Belgium shipping company specialized in the transportation of LNG, LPG, anhydrous ammonia and petrochemical gas, has selected our partner VICUSdt as the supplier to carry out a trim optimization for three LPG tankers with a capacity of 38,000 m3.


What was the approach?


Extensive studies have shown that the trim has a great influence on the ship resistance and the required propulsion power. Because the optimal trim differs according to draught and speed, VICUSdt has carry out a trim optimization study for Exmar to gain insight on this.


To calculate the optimal trim, VICUSdt has looked at different factors. For example, the rate of engine load, the sailing profile and the specific characteristics of the three vessels.


To do the calculations, VICUSdt has used advanced Computational Fluid Dynamics (CFD) software. With this method they have been able to analyze all operational scenario’s and sailing profiles of the three LPG tankers. The matrix, which was used for this purpose, contained 150 computations in total.


What was the result?


The trim optimization has resulted in reduced hull resistance of the three LPG tankers and a demonstrable saving on fuel costs. Exmar was impressed by VICUSdt’s practical approach and was happy with the achieved result.



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