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Encyclopedia of Marine Technology

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Emission Factors

Emission Factors: can be found in the IMO MEPC 623/23 Annex 8

Annual Efficiency Ratio (AER)

Annual Efficiency Ratio: “AER”, a carbon intensity metric calculated in accordance with Poseidon Principles.

Decarbonisation Trajectory

A representation of how many grams of CO2 a single ship can emit to move one ton of goods one nautical mile over a time horizon.

Energy Efficiency Operating Indicator “EEOI"

Energy Efficiency Operating Indicator “EEOI”, developed by the IMO in order to allow shipowners to measure the fuel efficiency of a ship in operation. It is a carbon intensity indicator “CII” and represents the demand for transport work.


Signatory: Poseidon Principles ( or Sea Cargo Charter ) is a financial institution (charterer) or ECA that has declared to the Global Maritime Forum, and been accepted, as a member of the Poseidon Principles ( Sea Cargo Charter.)

Recognised Organisation

Recognised Organisation “RO”, an authorized organization that performs statutory requirements on behalf of a vessel’s flag state. While often a Classification Society, in the IMO DCS, independent verifiers are authorized by some flag states.

Sea Cargo Charter

Sea Cargo Charter: charterers promoting responsible environmental stewardship throughout the maritime logistics value chain. It is aligned with the Poseidon Principles

IMO Data Collection System “DCS”:

IMO Data Collection System “DCS” defines data that the IMO mandates shipowners collect and report each calendar year.

Poseidon Principles

A global baseline to support societal goals and environmental responsibility consistent with the International Maritime Organization “IMO” ambitions for Green House Gas “GHG” reductions.

Bulk carrier, bulker

A vessel designed to carry dry cargo, loaded into the vessel with no containment other than that of the ship, s boundaries, as distinguished from the liquid bulk carrier or tanker.


The melting of filler metal and base metal (substrate) together, or of base metal only, to produce a weld.


A device that protects an electrical circuit from overcurrent.


Interior of boiler where fuel is burnt.


A smokestack of a vessel.


Harmful gas produced by fires, chemicals, fuel, etc.

Full speed

Highest possible speed of a vessel.

Fuel-water emulsification (FEW)

Invisible smoke technology is based on fuel-water emulsification (FEW), whereby the heavy fuel or diesel oil is homogenised with fresh water before injection into the engine.

Fuel oil tank protection

Old vessels, but unfortunately also many new ones, have bunkers in double hull and any shell damage can result in oil spill. This common practice has been stopped by new revised MARPOL Annex I, Regulation 13A.

Fuel oil transfer system

This system receives and stores fuel and delivers it to settling tanks. Fuel oils are loaded through deck fill connections that have sample connections provided to permit the fuel to be sampled as it is taken aboard.

Fuel viscosity

A measure of resistance of the fuel to flow at a stated temperature. According to ISO, the kinematic viscosity of heavy fuels should be specified in centistokes (cSt = 10-6m2/s) at 100°C.

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