Question 13 TK02 - Tank Vessel Assistant - Liquefied Gas

The Correct Answer is C ### Explanation for Option C (Correct) **C) shift bunkers forward:** Trim is the difference between the draft forward and the draft aft. Having "too much trim by the stern" means the vessel is deeper aft than desired. To reduce trim by the stern, weight (mass) must be moved forward (or removed from the stern). Bunkers (fuel oil) represent significant movable weight on a vessel. Shifting bunkers from stern tanks to forward tanks (or consuming fuel from stern tanks and replacing it with ballast forward, effectively a shift of mass) acts as a moment applied forward of the center of flotation (LCF), lifting the stern and lowering the bow, thereby reducing the excessive trim by the stern. ### Explanation for Incorrect Options **A) add ballast forward:** Adding weight anywhere on a vessel that is already "loaded down to her marks" (meaning she is at her maximum legal draft/load line) will submerge the vessel further, violating load line regulations and creating an unsafe condition (negative freeboard). While adding weight forward *would* reduce trim by the stern, it is not a permissible action when already at the marks. **B) load more cargo forward:** Similar to Option A, loading more cargo when already at the marks is illegal and dangerous as it exceeds the permissible load line. The focus must be on shifting existing weight or removing weight, not adding weight. **D) discharge cargo from the after tanks:** Discharging cargo reduces the overall displacement (makes the ship lighter). While removing weight from the stern *would* reduce trim by the stern, it would also increase the freeboard overall, making the vessel lighter than necessary. Since the vessel is loaded down *to* her marks, the goal is typically to maintain displacement while correcting the trim. Shifting internal weight (like bunkers) is the preferred method for correcting trim without altering overall displacement or draft.