Navalyze · Container · Ship

TONSBERG

IMO: 9216999
Type: Container ship
Average cargo carried: 43,257 t
Port of registry: Monrovia
Technical efficiency: EIV 20.35 g CO₂/t·nm
Former names: RIO BARROW

Report year

2021 at a glance

From the 2021 THETIS-MRV report. Carries about 43,257 t of cargo on average.

Fuel per mile

250.2 kg/nm

Container median 185.8 kg/nm (+35%)

CO₂ per transport work (cargo)

18.24

g CO₂/t·nm · Container median 17.90 (+2%)

Average speed

16.0 kn

Container median 14.1 kn (+13%)

Fuel per day at sea

95.8 t/day

Fuel consumed

2,467 t

CO₂ emitted

7,781 t

Distance sailed

9,862 nm

CO₂ ÷ CO₂ per mile

Time at sea

618 h

26 days, 7% of the year

Within the container fleet, 2021

Set against all 1,781 container ships with a full-year 2021 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 per mileThis ship 250.2 kg/nm · median 185.8 (+35%)

80.1Ranks 1,215 of 1,781, lowest first324.7

Average speedThis ship 16.0 kn · median 14.1 (+13%)

10.7Faster than 79% of container ships16.9

CO₂ per transport work (cargo)This ship 18.24 g CO₂/t·nm · median 17.90 (+2%)

7.81Ranks 905 of 1,781, lowest first49.96

Middle 80% of shipsMiddle 50%Container 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 ports9%
From the EU23%
Into the EU65%
At berth in the EU3%

Fuel burned laden

–

Not reported

CO₂ at berth

2.8%

Alongside in EU ports

Methane (CH₄)

–

Mainly from LNG; small for oil

CO₂eq ÷ CO₂

–

Uplift from CH₄ and N₂O, counted in full from 2026

Over the years

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

Fuel per mile, kg/nm

TONSBERG
Container median

160.0180.0200.0220.0240.0260.0

’202020’212021

Average speed, kn

TONSBERG
Container median

14.014.515.015.516.0

’202020’212021

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

TONSBERG
Container median

15.016.017.018.019.0

’202020’212021

Year on year

Year	Speed	Fuel per mile	Fuel per day	Distance	CO₂ per TW	Reading
2020→2021	+1.3 kn	+6%	+14%	+57%	+18%	1.3 kn faster, fuel per mile up 6%; 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	At sea h	Speed kn	Fuel kg/nm	CO₂ g/t·nm	Laden fuel
2021	not published	2,467	7,781	9,862	618	16.0	250.2	18.24	–
2020	not published	1,484	4,636	6,270	426	14.7	236.8	15.45	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/t·nm	Container median	vs Container	Rank	Verifier	Methods
2021	not published	18.24	17.90	+2%	905 of 1,781	RINA	A
2020	not published	15.45	17.58	−12%	762 of 1,797	RINA	A

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