Navalyze · Oil tanker · Ship

SIENNA

IMO: 9336971
Type: Oil tanker
Average cargo carried: 60,766 t
Flag (estimated): Liberia
Port of registry: Monrovia
Technical efficiency: EEXI 2.91 g CO₂/t·nm
Former names: GENER8 GEORGE T

ISM company (DoC holder) in 2024: CMB.TECH NV

Report year

2019 at a glance

From the 2019 THETIS-MRV report. Carries about 90,265 t of cargo on average.

Fuel kg/nm

171

Oil tanker median 138 kg/nm (+24%)

CO₂ per transport work (cargo)

5.96

g CO₂/t·nm · Oil tanker median 8.83 (−33%)

Average speed

9.7 kn

Oil tanker median 9.7 kn (+0%)

Fuel per day at sea

39.9 t/day

Fuel consumed

1,899 t

CO₂ emitted

5,989 t

Distance sailed

11,132 nm

CO₂ ÷ CO₂ per mile

Time at sea

1,143 h

48 days, 13% of the year

Within the oil tanker fleet, 2024

Set against all 1,787 oil tanker ships with a full-year 2024 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%)

79.5Ranks 1,246 of 1,787, lowest first194

Average speedThis ship 12.5 kn · median 10.9 (+15%)

8.1Faster than 93% of oil tanker ships12.3

CO₂ per transport work (cargo)This ship 7.69 g CO₂/t·nm · median 8.06 (−5%)

4.44Ranks 817 of 1,787, lowest first25.7

Middle 80% of shipsMiddle 50%Oil tanker medianThis ship

Where the emissions happen, 2019

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 ports0%
From the EU17%
Into the EU65%
At berth in the EU18%

Fuel burned laden

–

Not reported

CO₂ at berth

1,082 t

18.1% 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

SIENNA
Oil tanker median

100.0150.0200.0250.0300.0

’182018’192019’202020’222022’232023’242024

Average speed, kn

SIENNA
Oil tanker median

4.06.08.010.012.014.0

’182018’192019’202020’222022’232023’242024

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

SIENNA
Oil tanker median

5.010.015.020.0

’182018’192019’202020’222022’232023’242024

Year on year

Year	Average speed	Fuel kg/nm	Fuel per day at sea	Distance	CO₂ per transport work	Reading
2023→2024	+0.9 kn	+24%	+32%	−38%	+24%	0.9 kn faster, fuel per mile up 24%; worse than speed alone explains (fouling, weather, loading or trade).
2022→2023	+1.3 kn	+3%	+17%	+169%	+17%	1.3 kn faster, fuel per mile up 3%; better than speed alone explains (hull, engine or trade).
2020→2022	+4.5 kn	−46%	−4%	−36%	+1%	4.5 kn faster, fuel per mile down 46%; better than speed alone explains (hull, engine or trade).
2019→2020	−3.9 kn	+27%	−24%	−2%	−13%	3.9 kn slower, fuel per mile up 27%; worse than speed alone explains (fouling, weather, loading or trade).
2018→2019	−2.9 kn	−42%	−55%	+1,144%	−61%	2.9 kn slower, fuel per mile down 42%; in line with the speed change.

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
2024	CMB.TECH NV	1,729	5,411	11,580	930	12.5	149	7.69	–
2023	not published	2,252	7,067	18,644	1,604	11.6	121	6.18	–
2022	not published	814	2,545	6,935	675	10.3	117	5.27	–
2020	not published	2,348	7,362	10,870	1,868	5.8	216	5.20	–
2019	not published	1,899	5,989	11,132	1,143	9.7	171	5.96	–
2018	not published	263	827	895	71	12.6	294	15.4	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/t·nm	Oil tanker median	vs Oil tanker	Rank	Verifier	Methods
2024	CMB.TECH NV	7.69	8.06	−5%	817 of 1,787	EMICERT	A
2023	not published	6.18	8.44	−27%	473 of 1,797	EMICERT	A
2022	not published	5.27	8.51	−38%	296 of 1,961	EMICERT	A
2020	not published	5.20	9.03	−42%	236 of 1,870	EMICERT	A
2019	not published	5.96	8.83	−33%	418 of 1,919	EMICERT	A
2018	not published	15.4	8.86	+73%	1,411 of 1,779	Lloyd's Register	B

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.