At berth Total hours alongside h Average aux load kW Aux SFOC g/kWh
Boiler Boiler fired hours h Boiler fuel rate kg/h Tanker cargo heating ~200–600 kg/h depending on cargo, ambient, tank size.
Cargo operation Cargo-pump hours h Cargo-pump + aux extra load kW 0 if shore power drives the pumps.
Fuels Aux / pump fuel Heavy Fuel Oil (HFO / RMC..RMK) Very Low Sulphur Fuel Oil (VLSFO, ≤0.50% S) Ultra Low Sulphur Fuel Oil (ULSFO, ≤0.10% S) Light Fuel Oil (LFO / RMA, RMB) Marine Gas Oil (MGO / DMA, DMZ) Marine Diesel Oil (MDO / DMB) LNG - Otto cycle, medium-speed (4-stroke dual-fuel) LNG - Otto cycle, slow-speed (2-stroke low-pressure) LNG - Diesel cycle, slow-speed (2-stroke high-pressure) LPG - Propane LPG - Butane Methanol - grey (natural-gas feedstock) Bio-methanol e-Methanol (RFNBO from renewable H2 + captured CO2) Ammonia - grey (steam-methane reforming) Ammonia - blue (SMR + CCS) Ammonia - green (electrolytic, renewable) Hydrogen - grey (SMR) Hydrogen - green (renewable electrolysis) Bio-LNG (liquefied biomethane, waste feedstock) FAME biodiesel (B100, waste feedstock) HVO / Renewable Diesel (waste feedstock) Boiler fuel Heavy Fuel Oil (HFO / RMC..RMK) Very Low Sulphur Fuel Oil (VLSFO, ≤0.50% S) Ultra Low Sulphur Fuel Oil (ULSFO, ≤0.10% S) Light Fuel Oil (LFO / RMA, RMB) Marine Gas Oil (MGO / DMA, DMZ) Marine Diesel Oil (MDO / DMB) LNG - Otto cycle, medium-speed (4-stroke dual-fuel) LNG - Otto cycle, slow-speed (2-stroke low-pressure) LNG - Diesel cycle, slow-speed (2-stroke high-pressure) LPG - Propane LPG - Butane Methanol - grey (natural-gas feedstock) Bio-methanol e-Methanol (RFNBO from renewable H2 + captured CO2) Ammonia - grey (steam-methane reforming) Ammonia - blue (SMR + CCS) Ammonia - green (electrolytic, renewable) Hydrogen - grey (SMR) Hydrogen - green (renewable electrolysis) Bio-LNG (liquefied biomethane, waste feedstock) FAME biodiesel (B100, waste feedstock) HVO / Renewable Diesel (waste feedstock) Formula, assumptions, and limits
At berth the main engine is stopped. Aux load = hotel + any electric cargo-pump duty. Boiler burns oil at a flat kg/h rate for the fraction of the stay it is fired. CO₂ is per-fuel Cf.