Entries shall be made in the Oil Record Book on a tank-by-tank basis with regard to all of the following except:

The Oil Record Book (ORB) is a crucial document required to be maintained on oil tankers, ensuring that all oil transfers and operations are accurately recorded to prevent pollution and uphold environmental regulations. When discussing entries required in the ORB, it is essential to recognize what constitutes oil operations that need to be logged on a tank-by-tank basis.

For the option regarding "discharge from segregated ballast tanks," this is the correct choice because segregated ballast tanks are designed specifically to hold seawater used for ballast rather than any cargo oil or oil residues. Hence, discharges from these tanks do not pertain to oil management and, therefore, do not need to be recorded in the Oil Record Book.

In contrast, entries regarding the transfer of oil residues, cargo loading operations, and ballasting operations involve handling of oil products or residues, which must be documented in detail. Each of these operations affects the oil management on board and has implications for environmental protection measures. Therefore, they are mandated to be entered on a tank-by-tank basis to ensure comprehensive and traceable documentation of all oil handling activities.