STS Transfers Circular 24-11-2021
Transferring crude oil and petroleum products from one tanker to another at sea has been a common practice for many years. STS transfers involving tankers of 150 gross tons or above have since 1 January 2011 been regulated by MARPOL, Annex 1, Chapter 8 (Regulations 40 to 42). Such vessels are required to carry an STS operations plan which complies with these regulations and has been approved by the flag state of the vessel.