Navalyze · Oil tanker · Ship

DELTA STAR

IMO: 9458016
Type: Oil tanker
Average cargo carried: 54,061 t
Flag (estimated): Liberia
Port of registry: Monrovia
Technical efficiency: EIV 3.78 g CO₂/t·nm

ISM company (DoC holder) in 2025: DELTA TANKERS LTD

Report year

2021 at a glance

From the 2021 THETIS-MRV report. Carries about 49,402 t of cargo on average.

Fuel kg/nm

196

Oil tanker median 129 kg/nm (+52%)

CO₂ per transport work (cargo)

12.5

g CO₂/t·nm · Oil tanker median 8.86 (+41%)

Average speed

10.8 kn

Oil tanker median 10.7 kn (+1%)

Fuel per day at sea

51.0 t/day

Fuel consumed

6,788 t

CO₂ emitted

21,303 t

Distance sailed

34,636 nm

CO₂ ÷ CO₂ per mile

Time at sea

3,196 h

133 days, 36% 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 158 kg/nm · median 129 (+23%)

76.1Ranks 1,277 of 1,665, lowest first191

Average speedThis ship 10.4 kn · median 10.7 (−3%)

8.0Faster than 42% of oil tanker ships12.1

CO₂ per transport work (cargo)This ship 9.23 g CO₂/t·nm · median 7.95 (+16%)

4.51Ranks 996 of 1,665, lowest first27.7

Middle 80% of shipsMiddle 50%Oil tanker medianThis ship

Where the emissions happen, 2021

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 ports3%
From the EU42%
Into the EU44%
At berth in the EU11%

Fuel burned laden

–

Not reported

CO₂ at berth

2,348 t

11.0% 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

DELTA STAR
Oil tanker median

120.0140.0160.0180.0200.0

’182018’192019’202020’212021’222022’232023’242024’252025

Average speed, kn

DELTA STAR
Oil tanker median

8.09.010.011.012.0

’182018’192019’202020’212021’222022’232023’242024’252025

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

DELTA STAR
Oil tanker median

6.08.010.012.014.016.0

’182018’192019’202020’212021’222022’232023’242024’252025

Year on year

Year	Average speed	Fuel kg/nm	Fuel per day at sea	Distance	CO₂ per transport work	Reading
2024→2025	+2.1 kn	+3%	+30%	−25%	−12%	2.1 kn faster, fuel per mile up 3%; better than speed alone explains (hull, engine or trade).
2023→2024	−3.6 kn	−17%	−42%	+3%	−30%	3.6 kn slower, fuel per mile down 17%; worse than speed alone explains (fouling, weather, loading or trade).
2022→2023	+1.8 kn	−6%	+11%	+104%	+52%	1.8 kn faster, fuel per mile down 6%; better than speed alone explains (hull, engine or trade).
2021→2022	−0.7 kn	−0%	−7%	−60%	−20%	0.7 kn slower, fuel per mile flat; worse than speed alone explains (fouling, weather, loading or trade).
2020→2021	+1.5 kn	+16%	+35%	+25%	+22%	1.5 kn faster, fuel per mile up 16%; better than speed alone explains (hull, engine or trade).
2019→2020	−1.1 kn	+29%	+16%	+31%	+11%	1.1 kn slower, fuel per mile up 29%; worse than speed alone explains (fouling, weather, loading or trade).
2018→2019	+2.3 kn	−5%	+22%	−51%	−5%	2.3 kn faster, fuel per mile down 5%; better than speed alone explains (hull, engine or trade).

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	DELTA TANKERS LTD	3,441	10,882	21,809	2,087	10.4	158	9.23	–
2024	DELTA TANKERS LTD	4,483	14,027	29,269	3,539	8.3	153	10.5	–
2023	not published	5,226	16,468	28,453	2,384	11.9	184	15.1	–
2022	not published	2,730	8,569	13,953	1,386	10.1	196	9.94	–
2021	not published	6,788	21,303	34,636	3,196	10.8	196	12.5	–
2020	not published	4,653	14,605	27,624	2,960	9.3	168	10.2	–
2019	not published	2,760	8,667	21,100	2,032	10.4	131	9.19	–
2018	not published	5,911	18,495	42,939	5,298	8.1	138	9.65	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/t·nm	Oil tanker median	vs Oil tanker	Rank	Verifier	Methods
2025	DELTA TANKERS LTD	9.23	7.95	+16%	996 of 1,665	Lloyd's Register	A
2024	DELTA TANKERS LTD	10.5	8.06	+30%	1,217 of 1,787	Lloyd's Register	–
2023	not published	15.1	8.44	+79%	1,425 of 1,797	Lloyd's Register	–
2022	not published	9.94	8.51	+17%	1,186 of 1,961	Lloyd's Register	–
2021	not published	12.5	8.86	+41%	1,249 of 1,789	Lloyd's Register	A
2020	not published	10.2	9.03	+13%	1,085 of 1,870	Lloyd's Register	A
2019	not published	9.19	8.83	+4%	1,019 of 1,919	Lloyd's Register	A
2018	not published	9.65	8.86	+9%	998 of 1,779	EMICERT	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.