TMSA, short for Tanker Management and Self Assessment, is OCIMF's framework for measuring a tanker operator's shore-side management system against industry best practice. The operator scores itself across 13 elements, each staged from minimum expectation to leading practice, and publishes the result through OCIMF's SIRE programme for oil majors to read. No rule requires it; chartering to oil majors without it is close to impossible.
How it shows up in practice
The assessment happens at a desk, not on a ship. Shore management works element by element, from leadership and personnel through maintenance, navigation and emergency preparedness, and decides which stage the company genuinely operates at for each indicator. The honest word is "genuinely", because the claims get tested. A vetting reviewer reads the TMSA submission next to the fleet's SIRE 2.0 reports, and the comparison is unforgiving: an operator claiming a high stage in maintenance whose ships keep collecting process observations in inspections has told the reviewer something more damaging than a modest claim would have. How those observations reach the reviewer's desk is covered in negative observations and charterer screening.
The link runs the other way too. SIRE 2.0 records whether a shortfall traces to equipment, process or people, so a pattern of findings across a fleet reads as direct evidence about the office that manages it. TMSA and SIRE 2.0 have become two views of the same management system, one written by the operator, one recorded by an inspector.
What it means for operators
TMSA rewards operators who can prove what they claim. Every stage asserted needs records behind it: audits done, drills held, corrective actions closed with evidence, and vessel-level documentation that matches the office's story. The operators who struggle are rarely the ones with modest claims; they are the ones whose paper stages and shipboard reality have drifted apart, and whose gap shows up in charterer vetting as inconsistency. The full framework, its 13 elements and its four stages are worked through in the TMSA guide.