Navalyze · Chemical tanker · Ship

MONA SWAN

IMO: 9371804
Type: Chemical tanker
Average cargo carried: 4,367 t
Flag (estimated): Denmark
Port of registry: Middelfart
Technical efficiency: EIV 15.77 g CO₂/t·nm
Ice class: IC

ISM company (DoC holder) in 2025: Uni-Tankers A/S

Report year

2025 at a glance

From the 2025 THETIS-MRV report. Carries about 4,367 t of cargo on average.

Fuel kg/nm

61.4

Chemical tanker median 79.7 kg/nm (−23%)

CO₂ per transport work (cargo)

45.1

g CO₂/t·nm · Chemical tanker median 15.0 (+200%)

Average speed

10.5 kn

Chemical tanker median 11.1 kn (−5%)

Fuel per day at sea

15.4 t/day

Fuel consumed

1,192 t

CO₂ emitted

3,822 t

3,881 t CO₂eq incl. CH₄ and N₂O

Distance sailed

19,407 nm

CO₂ ÷ CO₂ per mile

Time at sea

1,856 h

77 days, 21% of the year

Within the chemical tanker fleet, 2025

Set against all 1,460 chemical 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 61.4 kg/nm · median 79.7 (−23%)

52.8Ranks 285 of 1,460, lowest first111

Average speedThis ship 10.5 kn · median 11.1 (−5%)

8.8Faster than 32% of chemical tanker ships12.4

CO₂ per transport work (cargo)This ship 45.1 g CO₂/t·nm · median 15.0 (+200%)

7.93Ranks 1,353 of 1,460, lowest first40.2

Middle 80% of shipsMiddle 50%Chemical tanker medianThis ship

Where the emissions happen, 2025

THETIS splits each ship's emissions 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 ports19%
From the EU36%
Into the EU31%
At berth in the EU14%

66% of this ship's CO₂ falls under the EU ETS (2,537 t).

Fuel burned laden

550 t

46% of all fuel; 54% in ballast or unladen

CO₂ at berth

525 t

13.7% of the ship's CO₂, alongside in EU ports

Methane (CH₄)

0.1 t

Mainly from LNG; small for oil, biofuel and methanol

CO₂eq uplift

+59 t

+1.5% CO₂eq on top of CO₂ alone, from CH₄ and N₂O; counted in full from 2026

Over the years

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

Fuel kg/nm

MONA SWAN
Chemical tanker median

40.060.080.0100.0120.0

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

Average speed, kn

MONA SWAN
Chemical tanker median

2.55.07.510.012.5

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

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

MONA SWAN
Chemical tanker median

0.020.040.060.080.0

’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	+0.4 kn	−9%	−6%	+8%	−13%	0.4 kn faster, fuel per mile down 9%; better than speed alone explains (hull, engine or trade).
2023→2024	−0.8 kn	−32%	−36%	+33%	−31%	0.8 kn slower, fuel per mile down 32%; better than speed alone explains (hull, engine or trade).
2022→2023	+2.8 kn	−9%	+22%	+30%	+39%	2.8 kn faster, fuel per mile down 9%; better than speed alone explains (hull, engine or trade).
2021→2022	−3.1 kn	+35%	−3%	−16%	−25%	3.1 kn slower, fuel per mile up 35%; worse than speed alone explains (fouling, weather, loading or trade).
2020→2021	−0.1 kn	−9%	−10%	−1%	−6%	Same speed, fuel per mile down 9%; better than speed alone explains (hull, engine or trade).
2019→2020	+8.3 kn	+18%	+346%	−29%	+29%	8.3 kn faster, fuel per mile up 18%; better than speed alone explains (hull, engine or trade).
2018→2019	−1.2 kn	+37%	−4%	−39%	+60%	1.2 kn slower, fuel per mile up 37%; worse than speed alone explains (fouling, weather, loading 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	Uni-Tankers A/S	1,192	3,822	19,407	1,856	10.5	61.4	45.1	46%
2024Bio blend	Uni-Tankers A/S	1,205	3,657	17,890	1,767	10.1	67.4	51.6	37%
2023	not published	1,333	4,273	13,488	1,241	10.9	98.8	74.8	–
2022	not published	1,130	3,621	10,377	1,283	8.1	109	54.0	–
2021	not published	995	3,190	12,308	1,097	11.2	80.8	71.5	–
2020	not published	1,106	3,545	12,433	1,101	11.3	88.9	76.2	–
2019	not published	1,324	4,245	17,520	5,887	3.0	75.6	59.2	–
2018	not published	1,582	5,072	28,612	6,789	4.2	55.3	37.0	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/t·nm	Chemical tanker median	vs Chemical tanker	Rank	Verifier	Methods
2025	Uni-Tankers A/S	45.1	15.0	+200%	1,353 of 1,460	ABS	B
2024Bio blend	Uni-Tankers A/S	51.6	16.7	+208%	1,200 of 1,274	ABS	B
2023	not published	74.8	16.2	+361%	1,294 of 1,314	ABS	B
2022	not published	54.0	16.1	+236%	1,354 of 1,409	Bureau Veritas	B
2021	not published	71.5	16.7	+329%	1,327 of 1,343	Bureau Veritas	B
2020	not published	76.2	16.2	+372%	1,299 of 1,312	Bureau Veritas	B
2019	not published	59.2	17.3	+242%	1,277 of 1,321	Bureau Veritas	B
2018	not published	37.0	17.1	+116%	1,099 of 1,294	Bureau Veritas	B

Fuel per mile and CO₂ per tonne-mile are the ship's own reported KPIs. Chemical 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 chemical 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.