Chemical tanker · Marshall Islands flag · built 2007
OCTADEN: CO₂ emissions 2018–2025
IMO 9340477 EU ETS8 reporting years
- CO₂ reported 2025
- 1,073 t
- Fuel burned
- 344 t
- Distance
- 4,391 nm
- Time at sea
- 489 h
- Share of year under way
- 6%
- Gross tonnage
- 11,570
OCTADEN against its type
Built in 2007, it is 3 years older than the median chemical tanker on this register, which was built in 2010 (1,951 vessels with a known build year). At 11,570 gross tonnage it is smaller than 77% of the other 1,899 chemical tankers with a recorded tonnage. It is one of 474 chemical tankers here under the Marshall Islands flag, 20.2% of the 2,344 on the register. Its MRV returns name it OCTADEN for 2018–2020 and OCTONAUT for 2021–2025. The reported port of registry changed: Manila (2018–2020), then Majuro (2021–2025).
Its 1,073 t of CO₂ for 2025 is 81% below the median of 5,531 t among the 1,484 chemical tankers on this register that reported for 2025. Per nautical mile it emitted 244.5 kg CO₂, close to the type median of 250.2 kg. It logged 489 hours at sea against a median of 2,106 hours for its type that year. 0.0% of its 2025 emissions were at berth; the median for chemical tankers was 6.6%. Across 8 years with reported emissions, the highest was 2021 (9,892 t) and the lowest 2025 (1,073 t). Its efficiency percentile within the type went from 85 in 2018 to 42 in 2025 (lower is more efficient). Of the 5 comparable vessels listed below with a 2025 return, 5 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 | 1,073 | 344 | 4,391 | 489 | 0 | 244.5 | 13.1 | 42 |
| 2024 | 8,479 | 2,700 | — | 3,745 | 0 | 208.3 | — | — |
| 2023 | 4,653 | 1,473 | 27,328 | 2,432 | 156 | 170.3 | 12.6 | 32 |
| 2022 | 3,567 | 1,129 | 17,640 | 1,458 | 157 | 202.2 | 20.6 | 68 |
| 2021 | 9,892 | 3,125 | 41,151 | 3,657 | 721 | 240.4 | 20.8 | 69 |
| 2020 | 2,011 | 640 | 9,222 | 771 | 81 | 218.1 | 15.2 | 46 |
| 2019 | 3,082 | 983 | 10,861 | 922 | 392 | 283.8 | 28.3 | 81 |
| 2018 | 6,841 | 2,167 | 19,156 | 2,509 | 1,927 | 357.1 | 31.7 | 85 |
Vessel particulars
- IMO number
- 9340477
- Previously reported as
- OCTONAUT
- Ship type
- Chemical tanker
- Gross tonnage
- 11,570
- Length overall
- 145.5 m
- Beam
- 23.7 m
- Year built
- 2007
- Flag state
- Marshall Islands per EU MRV 2025
Sources disagree: Wikidata/AIS (undated) list Philippines. The flag shown is from the newest official source, the EU MRV return for 2025. - Port of registry
- Majuro MRV 2025
- Home port
- Majuro
- Technical efficiency (design)
- EEXI (7.77 gCO₂/t·nm)
- Verifier
- Nippon Kaiji Kyokai, Japan
- Accreditation
- VS-21325-01
- Compliance document issued
- 2026-02-03
- Compliance document expires
- 2027-06-30
Efficiency against its own type2025
Position 574 of 1,348 qualifying chemical tankers by EEOI, at the 42nd percentile. The dashed line is the type median, 14.4; this vessel reported 13.1.
EEOI divides emissions by transport work, which for this vessel and year was 81,818,598 tonne-miles over 4,391 nautical miles.
Reported CO₂ by year
Reported CO₂ in 2025 was 84.3% lower than in 2018, for EU/EEA voyages only.
From 2024 to 2025, emissions fell 87.3% and CO₂ per nautical mile rose 17.3%.Distance is missing for at least one of the two years, so activity and efficiency cannot be separated here.
Where the 2025 emissions occurred
Methane, nitrous oxide and EU ETS2025
- Total CO₂ equivalent
- 1,090 t
- Methane (CH₄)
- 0.02 t
- Nitrous oxide (N₂O)
- 0.06 t
- Under EU ETS
- 537 t, 50% of total
Verifier history
| From reporting year | Verifier | Accredited in |
|---|---|---|
| 2018 | Bureau Veritas Certification France | France |
| 2021 | Nippon Kaiji Kyokai | Japan |
A change of verifier is not in itself a sign of anything being wrong.
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 8 MRV reporting years, an efficiency ranking, 4 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.