Navalyze · LNG carrier · Ship

COOL ROVER

IMO: 9333618
Type: LNG carrier
Flag (estimated): Malta
Port of registry: Valletta
Technical efficiency: EEXI 7.29 g CO₂/t·nm
Former names: BRITISH SAPPHIRE

ISM company (DoC holder) in 2025: Thenamaris LNG Inc · part of Thenamaris

Report year

2021 at a glance

From the 2021 THETIS-MRV report.

Fuel kg/nm

237

LNG carrier median 257 kg/nm (−8%)

CO₂ per transport work (volume)

6.97

g CO₂/m³·nm · LNG carrier median 10.5 (−33%)

Average speed

14.7 kn

LNG carrier median 14.6 kn (+1%)

Fuel per day at sea

83.7 t/day

Fuel consumed

7,625 t

CO₂ emitted

21,366 t

Distance sailed

32,141 nm

CO₂ ÷ CO₂ per mile

Time at sea

2,187 h

91 days, 25% of the year

Within the LNG carrier fleet, 2025

Set against all 386 LNG carrier 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 648 kg/nm · median 190 (+240%)

152Ranks 386 of 386, lowest first319

Average speedThis ship 12.2 kn · median 14.4 (−15%)

11.2Faster than 14% of LNG carrier ships15.9

CO₂ per transport work (volume)This ship 30.2 g CO₂/m³·nm · median 7.12 (+324%)

5.06Ranks 367 of 386, lowest first16.1

Middle 80% of shipsMiddle 50%LNG carrier 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 ports14%
From the EU30%
Into the EU48%
At berth in the EU8%

Fuel burned laden

4,850 t

64% of all fuel; 36% in ballast or unladen

CO₂ at berth

1,701 t

8.0% 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 LNG carrier median is the middle ship of all LNG carrier ships reporting that year; it moves with the fleet, so a ship can gain on it without changing itself.

Fuel kg/nm

COOL ROVER
LNG carrier median

0.0200.0400.0600.0800.0

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

Average speed, kn

COOL ROVER
LNG carrier median

10.012.014.016.018.0

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

CO₂ per transport work (volume), g CO₂/m³·nm

COOL ROVER
LNG carrier median

0.020.040.060.0

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

Year on year

Year	Average speed	Fuel kg/nm	Fuel per day at sea	Distance	CO₂ per transport work	Reading
2024→2025	−2.7 kn	+118%	+79%	−88%	+211%	2.7 kn slower, fuel per mile up 118%; worse than speed alone explains (fouling, weather, loading or trade).
2023→2024	+3.0 kn	+25%	+56%	+166%	+6%	3.0 kn faster, fuel per mile up 25%; better than speed alone explains (hull, engine or trade).
2021→2023	−2.8 kn	−0%	−19%	+19%	+32%	2.8 kn slower, fuel per mile flat; worse than speed alone explains (fouling, weather, loading or trade).
2020→2021	+1.5 kn	−6%	+5%	−35%	−34%	1.5 kn faster, fuel per mile down 6%; better than speed alone explains (hull, engine or trade).
2019→2020	+0.6 kn	−44%	−42%	+35%	−78%	0.6 kn faster, fuel per mile down 44%; better than speed alone explains (hull, engine or trade).
2018→2019	−4.8 kn	+54%	+12%	+354%	+325%	4.8 kn slower, fuel per mile up 54%; 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	Thenamaris LNG Inc	8,051	24,421	12,426	1,020	12.2	648	–	–
2024LNG	Thenamaris LNG Inc	30,170	81,379	101,618	6,840	14.9	297	–	–
2023LNG / alt.	not published	9,053	25,837	38,240	3,210	11.9	237	–	–
2021LNG / alt.	not published	7,625	21,366	32,141	2,187	14.7	237	–	64%
2020LNG / alt.	not published	12,413	34,280	49,306	3,725	13.2	252	–	–
2019LNG / alt.	not published	16,546	45,781	36,541	2,891	12.6	453	–	–
2018LNG / alt.	not published	2,366	6,516	8,052	462	17.4	294	–	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/m³·nm	LNG carrier median	vs LNG carrier	Rank	Verifier	Methods
2025	Thenamaris LNG Inc	30.2	7.12	+324%	367 of 386	RINA	B+C
2024LNG	Thenamaris LNG Inc	9.71	7.39	+31%	214 of 312	RINA	B+C
2023LNG / alt.	not published	9.19	9.10	+1%	180 of 355	RINA	B+C
2021LNG / alt.	not published	6.97	10.5	−33%	63 of 289	ABS	–
2020LNG / alt.	not published	10.6	10.7	−1%	130 of 267	ABS	–
2019LNG / alt.	not published	47.2	10.9	+334%	241 of 248	ABS	–
2018LNG / alt.	not published	11.1	10.9	+2%	102 of 197	ABS	A+C

Fuel per mile and CO₂ per tonne-mile are the ship's own reported KPIs. LNG carrier ships are benchmarked on CO₂ per transport work (volume) (TW), in g CO₂/m³·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 LNG carrier 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.