Chemical tanker · Portugal flag · built 2004

ARKOS: CO₂ emissions 2018–2025

IMO 9286827 EU ETS8 reporting years

CO₂ reported 2025: 5,347 t
Fuel burned: 1,668 t
Distance: 32,858 nm
Time at sea: 3,498 h
Emitted at berth: 5% of total
Share of year under way: 40%
Gross tonnage: 8,829

ARKOS against its type

Built in 2004, it is 6 years older than the median chemical tanker on this register, which was built in 2010 (1,951 vessels with a known build year). At 8,829 gross tonnage it is smaller than 83% of the other 1,899 chemical tankers with a recorded tonnage. It is one of 71 chemical tankers here under the Portugal flag, 3.0% of the 2,344 on the register. The same builder is recorded for 98 other vessels here, 3 of them chemical tankers. Its MRV returns name it EKEN for 2018–2023 and ARKOS for 2024–2025. The reported port of registry changed: Arendal (2018–2023), then Madeira (2024–2025).

Its 5,347 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 162.7 kg CO₂, 35% below the type median of 250.2 kg. It logged 3,498 hours at sea against a median of 2,106 hours for its type that year. 4.8% of its 2025 emissions were at berth; the median for chemical tankers was 6.6%. Across 8 years with reported emissions, the highest was 2018 (8,666 t) and the lowest 2024 (4,449 t). Its efficiency percentile within the type went from 98 in 2018 to 84 in 2025 (lower is more efficient). Of the 4 comparable vessels listed below with a 2025 return, 1 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	5,347	1,668	32,858	3,498	258	162.7	29.5	84
2024	4,449	1,388	24,747	2,473	360	179.8	41.0	92
2023	5,971	1,863	28,898	2,783	629	206.6	37.1	88
2022	6,303	1,966	34,827	3,569	721	181.0	34.1	99
2021	7,319	2,283	44,186	4,169	758	165.6	28.0	96
2020	7,517	2,345	42,753	4,128	845	175.8	28.3	95
2019	7,057	2,201	40,663	6,043	823	173.5	27.5	96
2018	8,666	2,703	42,064	6,294	1,078	206.0	34.2	98

Vessel particulars

IMO number: 9286827
Previously reported as: EKEN
Ship type: Chemical tanker
Gross tonnage: 8,829
Length overall: 134.7 m
Year built: 2004
Flag state: Portugal per EU MRV 2025
Sources disagree: Wikidata/AIS (undated) list Norway. The flag shown is from the newest official source, the EU MRV return for 2025.
Builder: Jiangnan Shipyard
Port of registry: Madeira MRV 2025
Ice class: IA
Technical efficiency (design): EEXI (9.14 gCO₂/t·nm)
Verifier: ICS Verification Services Single Member P.C., Greece
Accreditation: 1101-3
Compliance document issued: 2026-03-04
Compliance document expires: 2027-06-30

Efficiency against its own type2025

Position 1,129 of 1,348 qualifying chemical tankers by EEOI, at the 84th percentile. The dashed line is the type median, 14.4; this vessel reported 29.5.

EEOI divides emissions by transport work, which for this vessel and year was 181,240,339 tonne-miles over 32,858 nautical miles.

Reported CO₂ by year

Reported CO₂ in 2025 was 38.3% lower than in 2018, for EU/EEA voyages only.

From 2024 to 2025, emissions rose 20.2% while distance sailed rose 32.8%and CO₂ per nautical mile fell 9.5%.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: 5,428 t
Methane (CH₄): 0.08 t
Nitrous oxide (N₂O): 0.30 t
Under EU ETS: 3,287 t, 61% of total

Laden voyages2025

CO₂ on laden voyages: 3,715 t, 69% of total
Fuel, laden: 1,159 t
CO₂ per nm, laden: 156.8 kg

The rest of the 2025 total was emitted on ballast legs or at berth.

Verifier history

From reporting year	Verifier	Accredited in
2018	DNV	Germany
2024	ICS Verification Services Single Member P.C.	Greece

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) and Wikimedia Commons.

This page draws on 8 MRV reporting years, an efficiency ranking, 5 of 5 vessel particulars, a name history and a licensed photograph. Not found in the sources for this vessel: AIS movements in Norwegian waters, 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.