Navalyze · Oil tanker · Ship

SILVER HEBA

IMO: 9718870
Type: Oil tanker
Average cargo carried: 33,227 t
Flag (estimated): Hong Kong (China)
Port of registry: Hong Kong
Technical efficiency: EEDI 4.35 g CO₂/t·nm

ISM company (DoC holder) in 2025: Roc Shipping One Designated Activity Company

Report year

2025 at a glance

From the 2025 THETIS-MRV report. Carries about 33,227 t of cargo on average.

Fuel kg/nm

92.5

Oil tanker median 129 kg/nm (−28%)

CO₂ per transport work (cargo)

8.77

g CO₂/t·nm · Oil tanker median 7.95 (+10%)

Average speed

9.7 kn

Oil tanker median 10.7 kn (−9%)

Fuel per day at sea

21.5 t/day

Fuel consumed

2,076 t

CO₂ emitted

6,539 t

6,641 t CO₂eq incl. CH₄ and N₂O

Distance sailed

22,440 nm

CO₂ ÷ CO₂ per mile

Time at sea

2,316 h

97 days, 26% 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 92.5 kg/nm · median 129 (−28%)

76.1Ranks 345 of 1,665, lowest first191

Average speedThis ship 9.7 kn · median 10.7 (−9%)

8.0Faster than 25% of oil tanker ships12.1

CO₂ per transport work (cargo)This ship 8.77 g CO₂/t·nm · median 7.95 (+10%)

4.51Ranks 947 of 1,665, lowest first27.7

Middle 80% of shipsMiddle 50%Oil 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 ports31%
From the EU43%
Into the EU17%
At berth in the EU10%

70% of this ship's CO₂ falls under the EU ETS (4,598 t).

Fuel burned laden

1,877 t

90% of all fuel; 10% in ballast or unladen

CO₂ at berth

642 t

9.8% 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

+102 t

+1.6% CO₂eq on top of CO₂ alone, from CH₄ and N₂O; counted in full from 2026

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

SILVER HEBA
Oil tanker median

60.080.0100.0120.0140.0

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

Average speed, kn

SILVER HEBA
Oil tanker median

4.06.08.010.012.014.0

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

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

SILVER HEBA
Oil tanker median

5.010.015.020.025.0

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

Year on year

Year	Average speed	Fuel kg/nm	Fuel per day at sea	Distance	CO₂ per transport work	Reading
2024→2025	+5.1 kn	−30%	+48%	+1,187%	−61%	5.1 kn faster, fuel per mile down 30%; better than speed alone explains (hull, engine or trade).
2023→2024	−7.2 kn	+99%	−23%	−87%	+173%	7.2 kn slower, fuel per mile up 99%; worse than speed alone explains (fouling, weather, loading or trade).
2022→2023	−0.4 kn	−5%	−8%	−63%	−8%	0.4 kn slower, fuel per mile down 5%; in line with the speed change.
2021→2022	+3.9 kn	−7%	+37%	+193%	−23%	3.9 kn faster, fuel per mile down 7%; better than speed alone explains (hull, engine or trade).
2019→2021	−3.0 kn	−8%	−33%	+36%	+52%	3.0 kn slower, fuel per mile down 8%; worse than speed alone explains (fouling, weather, loading or trade).
2018→2019	+0.1 kn	+11%	+12%	−64%	+11%	Same speed, fuel per mile up 11%; 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	Roc Shipping One Designated Activity Company	2,076	6,539	22,440	2,316	9.7	92.5	8.77	90%
2024	Roc Shipping One Designated Activity Company	230	733	1,744	381	4.6	132	22.6	75%
2023	not published	909	2,890	13,734	1,160	11.8	66.2	8.30	–
2022	not published	2,562	8,063	36,799	3,014	12.2	69.6	9.05	–
2021	not published	938	2,932	12,557	1,514	8.3	74.7	11.7	–
2019	not published	753	2,374	9,233	816	11.3	81.6	7.71	–
2018	not published	1,912	5,992	26,007	2,318	11.2	73.5	6.93	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/t·nm	Oil tanker median	vs Oil tanker	Rank	Verifier	Methods
2025	Roc Shipping One Designated Activity Company	8.77	7.95	+10%	947 of 1,665	Lloyd's Register	A+C
2024	Roc Shipping One Designated Activity Company	22.6	8.06	+181%	1,564 of 1,787	Lloyd's Register	A+C
2023	not published	8.30	8.44	−2%	879 of 1,797	ClassNK	B+C
2022	not published	9.05	8.51	+6%	1,069 of 1,961	ABS	B+C
2021	not published	11.7	8.86	+32%	1,206 of 1,789	ABS	C
2019	not published	7.71	8.83	−13%	758 of 1,919	ABS	C
2018	not published	6.93	8.86	−22%	569 of 1,779	ABS	B+C

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.