Harbour / Escort Tug Fuel & CO₂

Harbour tugs and escort tugs - short, high-power bursts at berthing, long idle periods on station. Outside CII scope; per-job or per-operating-hour intensity.

Ship typeWork boatTug

Operational year

Jobs / year–Busy port tug 800-1500 jobs; specialised escort tug 200-400 jobs.Operating daysd

Fuel

FuelMasst

Annual CO₂: 1,122.1t

Daily fuel: 1.06t/day

CO₂ per job: 1,246.778kg / job

Changing the inputs requires JavaScript. The calculator above shows its default inputs and result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

\text{CO}_2^\text{year} = \sum_j F_j \cdot C_{f,j}

Symbol	Meaning	Unit
$F_j$	Mass of fuel $j$	t
$C_{f,j}$	CO₂ factor	t CO₂ / t fuel
$Bench (Jobs / year)$	operational benchmark
$d_\text{op}$	Operating days	d

Source: ITS - International Tug & Salvage sustainability; IMO MEPC.364(79) - Cf conversion factors

In short

Harbour tugs and escort tugs - short, high-power bursts at berthing, long idle periods on station.

Learn the theory Specialised Ship Types: Ro-ro, Reefer, Heavy-Lift