[QUOTE=fran.cesc17;180296]Thank you for the answers.
I am going to explain you the background.
I need to carry out a design of a wind assisted system (basically wing sails) on board an oil tanker. I am just trying to choose where to place these devices. I thought that if I chose a tanker with pipes not exactly in the middle line plane, I would have the chance to place my devices in the symmetrical plane in order not to have stability problems. So I was thinking that maybe if there is a reason why those pipes are not in middle maybe there is a reason why I should not place my devices in the symmetrical plane.
What do you think about it?[/QUOTE]
Just make sure you keep in mind the class rules on structure and visibility.
ABS Steel Vessel Rules 2016, Part 3, Chapter 6 (Navigation), Section 1 (Visibility)
“1.1.1(b) No blind sector caused by cargo, cargo gear or other obstructions outside of the wheelhouse forward of the beam which obstructs the view of the sea surface as seen from the conning position is to exceed 10°. The total arc of blind sectors is not to exceed 20°. The clear sectors between blind sectors are to be at least 5°. However, in the view described in 3-6-1/1.1.1(a), each individual blind sector is not to exceed 5°.”