Division 2 Application of the formula

Since the energy values of the different marine fuels involved in the formula are largely similar, it is justified to use standard values for E_F0,1 % , E_F and E_BOG in order to simplify the application of the formula in practice. More particularly, the following standard energy values may be presumed to apply:

E_F0,1 %

43,0 MJ/kg (source: DNV Petroleum Services)

E_F

40,8 MJ/kg (source: DNV Petroleum Services)

E_BOG

50,0 MJ/kg (ISO energy figure for methane)

The formula would accordingly be simplified as follows:

R_G/F ≥ 8,6 · S_F (%) – 0,816

On this basis, the only value that needs to be introduced to the formula to arrive at the required ratio between the mass of boil-off gas and marine fuel consumed (R_G/F or M_BOG/M_F ) is the sulphur content of the marine fuel used while at berth. By means of examples, the table below indicates the minimum ratio required to meet the equivalence criteria for marine fuels with different sulphur contents.