Navalyze · Oil tanker · Ship

ASPEN

IMO: 9818058
Type: Oil tanker
Average cargo carried: 54,752 t
Flag (estimated): Liberia
Port of registry: Monrovia
Technical efficiency: EEDI 3.27 g CO₂/t·nm
Ice class: IA
Former names: EIKEVIKEN

ISM company (DoC holder) in 2025: QUARTZ MARITIME LIMITED

Report year

2022 at a glance

From the 2022 THETIS-MRV report. Carries about 63,840 t of cargo on average.

Fuel kg/nm

141

Oil tanker median 131 kg/nm (+7%)

CO₂ per transport work (cargo)

6.88

g CO₂/t·nm · Oil tanker median 8.51 (−19%)

Average speed

11.4 kn

Oil tanker median 10.9 kn (+5%)

Fuel per day at sea

38.4 t/day

Fuel consumed

6,962 t

CO₂ emitted

21,753 t

Distance sailed

49,527 nm

CO₂ ÷ CO₂ per mile

Time at sea

4,350 h

181 days, 50% of the year

Within the oil tanker fleet, 2025

Set against all 1,665 oil tanker ships with a full-year 2025 report. Bigger ships burn more per mile but less per tonne of cargo, so read fuel per mile with the ship's size in mind.

Fuel kg/nmThis ship 149 kg/nm · median 129 (+16%)

76.1Ranks 1,169 of 1,665, lowest first191

Average speedThis ship 10.1 kn · median 10.7 (−6%)

8.0Faster than 34% of oil tanker ships12.1

CO₂ per transport work (cargo)This ship 8.52 g CO₂/t·nm · median 7.95 (+7%)

4.51Ranks 922 of 1,665, lowest first27.7

Middle 80% of shipsMiddle 50%Oil tanker medianThis ship

Where the emissions happen, 2022

THETIS splits each ship's CO₂ by voyage type. The split sets how much falls under the EU ETS: all of it within the EU and at berth, half of it on voyages into or out of the EU.

Between EU ports1%
From the EU34%
Into the EU51%
At berth in the EU13%

Fuel burned laden

–

Not reported

CO₂ at berth

2,917 t

13.4% of the ship's CO₂, alongside in EU ports

Methane (CH₄)

–

Mainly from LNG; small for oil, biofuel and methanol

CO₂eq uplift

–

CO₂eq on top of CO₂ alone, from CH₄ and N₂O

Over the years

Full-year reports only. The Oil tanker median is the middle ship of all oil tanker ships reporting that year; it moves with the fleet, so a ship can gain on it without changing itself.

Fuel kg/nm

ASPEN
Oil tanker median

120.0130.0140.0150.0160.0

’192019’202020’212021’222022’232023’242024’252025

Average speed, kn

ASPEN
Oil tanker median

9.510.010.511.011.5

’192019’202020’212021’222022’232023’242024’252025

CO₂ per transport work (cargo), g CO₂/t·nm

ASPEN
Oil tanker median

6.08.010.012.0

’192019’202020’212021’222022’232023’242024’252025

Year on year

Year	Average speed	Fuel kg/nm	Fuel per day at sea	Distance	CO₂ per transport work	Reading
2024→2025	−0.7 kn	+3%	−3%	−0%	−14%	0.7 kn slower, fuel per mile up 3%; worse than speed alone explains (fouling, weather, loading or trade).
2023→2024	−0.6 kn	−9%	−14%	+27%	+19%	0.6 kn slower, fuel per mile down 9%; in line with the speed change.
2022→2023	+0.0 kn	+13%	+13%	−1%	+22%	Same speed, fuel per mile up 13%; worse than speed alone explains (fouling, weather, loading or trade).
2021→2022	+1.4 kn	−4%	+9%	−7%	−5%	1.4 kn faster, fuel per mile down 4%; better than speed alone explains (hull, engine or trade).
2020→2021	+0.2 kn	−6%	−3%	+33%	−32%	Same speed, fuel per mile down 6%; better than speed alone explains (hull, engine or trade).
2019→2020	−0.8 kn	+17%	+8%	+11%	+62%	0.8 kn slower, fuel per mile up 17%; worse than speed alone explains (fouling, weather, loading or trade).

Part-year reports are left out of these comparisons. Fuel per mile rises roughly with the square of speed for a given ship, so a change in speed explains much of a change in fuel per mile.

Every reporting year

One row per THETIS-MRV report. A ship that changed operator during a year has a part-year report for each.

Operation

Year	ISM company	Fuel t	CO₂ t	Distance nm	Hours at seah	Average speedknots at sea	Fuel kg/nmthis ship	CO₂ per transport work (cargo)g/t·nm, this ship	Laden fuel
2025	QUARTZ MARITIME LIMITED	9,224	28,828	61,798	6,091	10.1	149	8.52	–
2024part-year	VIKEN CRUDE AS	3,309	10,365	22,453	2,320	9.7	147	14.1	36%
2024	QUARTZ MARITIME LIMITED	8,995	28,192	62,068	5,747	10.8	145	9.93	46%
2023	not published	7,805	24,393	49,012	4,307	11.4	159	8.37	64%
2022	not published	6,962	21,753	49,527	4,350	11.4	141	6.88	–
2021	not published	7,811	24,439	53,521	5,338	10.0	146	7.24	–
2020	not published	6,219	19,602	40,204	4,108	9.8	155	10.7	–
2019	not published	4,785	15,172	36,210	3,404	10.6	132	6.62	100%

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/t·nm	Oil tanker median	vs Oil tanker	Rank	Verifier	Methods
2025	QUARTZ MARITIME LIMITED	8.52	7.95	+7%	922 of 1,665	ABS	A
2024part-year	VIKEN CRUDE AS	–	–	–	–	ABS	–
2024	QUARTZ MARITIME LIMITED	9.93	8.06	+23%	1,160 of 1,787	ABS	A
2023	not published	8.37	8.44	−1%	891 of 1,797	ABS	–
2022	not published	6.88	8.51	−19%	655 of 1,961	Verifavia	A
2021	not published	7.24	8.86	−18%	635 of 1,789	Verifavia	A
2020	not published	10.7	9.03	+18%	1,143 of 1,870	Verifavia	A
2019	not published	6.62	8.83	−25%	539 of 1,919	ABS	A

Fuel per mile and CO₂ per tonne-mile are the ship's own reported KPIs. Oil tanker ships are benchmarked on CO₂ per transport work (cargo) (TW), in g CO₂/t·nm. CO₂eq adds methane and nitrous oxide and is in the public files from 2024. Rank counts from the lowest figure among that year's oil tanker ships. Methods: A delivery notes, B tank monitoring, C flow meters, D direct measurement. FuelEU GHG intensity is not shown: it needs fuel types, which the public file does not carry. Operators are named only from 2024, the first year the public files carry them; earlier years belong to the ship, not to any company.