The data used to calculate a vessel’s GHG Emissions Rating can be viewed:Read More
RightShip recognises that the reliability of its calculations directly correlates to the accuracy of source data. RightShip continues to work closely with ship owners, managers, yards and classification societies to validate the data used for the calculations.
The data utilised for the GHG Rating calculation is, as far as practicable, in line with the IMO guidelines (MEPC.245(66)) for EEDI calculation. RightShip obtains data for the GHG Rating from various industry sources as outlined below.
The source data for the GHG Rating is based on the hierarchy found in the table below.
As outlined in the DNV GL review, due to the pre-defined set of data assumptions applied to ‘non-verified’ vessels, there is an incentive for shipowners to update relevant data within Qi as it is likely to result in an improved GHG Rating.
|PREFERENCE / VERIFICATION LEVEL||DATA TYPE||DATA SOURCE / EXAMPLE|
|Most preferred / highest level of verification||Energy Efficiency Design Index||Classification Societies e.g. EEDI Technical Files
EEDI certificate (including supplement)
|Ship specific specifications||Ship-sourced data, e.g. sea trial and shop test supplied by the vessel owner / manager|
|Industry / third party data sources||Engine manufacturer's specifications
Data sourced from ship yards
|Least preferred / benefit from verification||IHS Maritime database|
IHS Maritime Database
The following documentation is requested to ensure the ship particulars are up to date:Read More
If the EEDI Technical File is not available, please provide the documentation outlined in the table below.
Upon receipt of the documentation, RightShip’s sustainability team will review and update the vessel particulars and provide the updated GHG Rating.
|DOCUMENTATION TYPE||RELATING FACTOR||RELEVANT DETAILS|
|Sea Trial||Vref Speed (Knots)||Trial Speed at Summer/ Scantling Load Draught at 75% Maximum Continuous Rating (MCR). In the form of a sea trial curve (calculated and/or model curves are acceptable)|
|Shop Test - Main and Auxiliary Engines||Number of Engines |
Power of engines (MCR)
Specific Fuel Consumption (SFC)
Fuel Type (test conditions)
|SFC for the Main Engine is read at 75% MCR
SFC for the Auxiliary Engines is read at 50% MCR
|Class Certificate and/or Ship Capacity Plan||Capacity||Deadweight (DWT)
TEU (if applicable)
CBM (if applicable)
|Ship classification notations||Common Structural Rules (include LBP and LWT)
Cubic-capacity correction factor
General cargo equipped with cranes
|Other documentation as appropriate||Innovative energy efficient technologies||Examples include waste heat recovery and shaft motor generator|
As stated above, SFC figures are sourced from vessel-specific shop tests or EEDI technical files.Read More
If the data is not provided by the ship owner, the values used in the calculation are based on the same assumptions used in the IMO GHG Study and / or detailed in IMO Circulars on the calculation of the energy efficiency measure as listed below.
|ENGINE AGE||MCRME (kW)||SFCME (g/kWh)|
|Pre 1983||> 15,000||205|
|5,000 to 15,000||215|
|5,000 to 15,000||195|
|5,000 to 15,000||185|
|5,000 to 15,000||185|
|MCRAE (kW)||SFCAE (g/kWh)|
|> 800 kW||220|
|< 800 kW||230|