Chemical tanker · Liberia flag · built 2015
DONG-A TRITON: CO₂ emissions 2018–2025
IMO 9686986 EU ETS4 reporting years
- CO₂ reported 2025
- 5,733 t
- Fuel burned
- 1,822 t
- Distance
- 18,233 nm
- Time at sea
- 1,865 h
- Emitted at berth
- 9% of total
- Share of year under way
- 21%
- Gross tonnage
- 28,160
DONG-A TRITON against its type
Built in 2015, it is 5 years newer than the median chemical tanker on this register, which was built in 2010 (1,951 vessels with a known build year). At 28,160 gross tonnage it is larger than 66% of the other 1,899 chemical tankers with a recorded tonnage. It is one of 402 chemical tankers here under the Liberia flag, 17.2% of the 2,344 on the register. The same builder is recorded for 983 other vessels here, 330 of them chemical tankers. Its MRV returns name it DONG-A TRITON for 2018–2020 and OCIOS IOANNIS for 2025. The reported port of registry changed: Panama (2018–2020), then Monrovia (2025).
Its 5,733 t of CO₂ for 2025 is close to the median of 5,531 t among the 1,484 chemical tankers on this register that reported for 2025. Per nautical mile it emitted 314.4 kg CO₂, 26% above the type median of 250.2 kg. It logged 1,865 hours at sea against a median of 2,106 hours for its type that year. 8.5% of its 2025 emissions were at berth; the median for chemical tankers was 6.6%. Across 4 years with reported emissions, the highest was 2025 (5,733 t) and the lowest 2020 (2,322 t). Its efficiency percentile within the type went from 16 in 2019 to 30 in 2025 (lower is more efficient). Of the 7 sister ships listed below with a 2025 return, 7 reported a lower CO₂ per nautical mile than this vessel.
Emissions by year2018–2025
| Year | CO₂ (t) | Fuel (t) | Distance (nm) | At sea (h) | At berth (t) | kg CO₂/nm | EEOI | Percentile |
|---|---|---|---|---|---|---|---|---|
| 2025 | 5,733 | 1,822 | 18,233 | 1,865 | 489 | 314.4 | 11.0 | 30 |
| 2020 | 2,322 | 735 | 9,702 | 808 | 274 | 239.4 | 6.5 | 1 |
| 2019 | 3,635 | 1,154 | 11,463 | 995 | 470 | 317.1 | 10.3 | 16 |
| 2018 | 3,587 | 1,149 | — | 841 | 507 | 338.4 | 66.5 | not ranked |
Vessel particulars
- IMO number
- 9686986
- Previously reported as
- OCIOS IOANNIS
- Ship type
- Chemical tanker
- Gross tonnage
- 28,160
- Length overall
- 183.0 m
- Beam
- 32.0 m
- Year built
- 2015
- Flag state
- Liberia per EU MRV 2025
Sources disagree: Wikidata/AIS (undated) list Panama. The flag shown is from the newest official source, the EU MRV return for 2025. - Builder
- HD Hyundai Mipo
- Port of registry
- Monrovia MRV 2025
- Technical efficiency (design)
- EEDI (6.21 gCO₂/t·nm)
- Verifier
- AMERICAN BUREAU OF SHIPPING HELLENIC SINGLE MEMBER LIMITED LIABILITY COMPANY (ABS HELLENIC S.M. LTD), Greece
- Accreditation
- 1083-2
- Compliance document issued
- 2026-03-16
- Compliance document expires
- 2027-06-30
Efficiency against its own type2025
Position 404 of 1,348 qualifying chemical tankers by EEOI, at the 30th percentile. The dashed line is the type median, 14.4; this vessel reported 11.0.
EEOI divides emissions by transport work, which for this vessel and year was 521,651,501 tonne-miles over 18,233 nautical miles.
Reported CO₂ by year
Reported CO₂ in 2025 was 59.8% higher than in 2018, for EU/EEA voyages only. No return is recorded for 2021, 2022, 2023, 2024, so the series has gaps.
From 2020 to 2025, emissions rose 146.9% while distance sailed rose 87.9%and CO₂ per nautical mile rose 31.4%.That points mainly to how much the vessel sailed, rather than the other.
Where the 2025 emissions occurred
Methane, nitrous oxide and EU ETS2025
- Total CO₂ equivalent
- 5,822 t
- Methane (CH₄)
- 0.09 t
- Nitrous oxide (N₂O)
- 0.33 t
- Under EU ETS
- 3,743 t, 65% of total
Laden voyages2025
- CO₂ on laden voyages
- 4,810 t, 84% of total
- Fuel, laden
- 1,534 t
- CO₂ per nm, laden
- 281.1 kg
The rest of the 2025 total was emitted on ballast legs or at berth.
Sources and how to read this
- Emissions: EU MRV publication (THETIS-MRV), reporting years 2018–2025, published by the European Commission.
- Vessel particulars: Wikidata (CC0).
This page draws on 4 MRV reporting years, an efficiency ranking, 5 of 5 vessel particulars and a name history. Not found in the sources for this vessel: AIS movements in Norwegian waters, a licensed photograph, a sanctions listing and US port state inspections.
Empty means unreported, never zero. How EEOI, distance, percentiles and sister ships are handled is explained under reading a vessel page. Something wrong? See corrections.