The provisions of this section apply for calculating evaporative emission credits. This applies only for fuel tank permeation. You may generate credits only if you are a certifying vessel manufacturer. This may include outboard engine manufacturers if they install under-cowl fuel tanks.
Emission credits (kg) = (STD-FEL) * (Total Area) * (UL) * (AF) * (365) * (10-3)
Where:
STD = the emission standard, in g/m2/day.
FEL = the family emission limit for the family, in g/m2/day, as described in paragraph (b) of this section.
Total Area = The combined internal surface area of all fuel tanks in the family, in m2.
UL = 5 years, which represents the useful life for the given family.
AF = adjustment factor. Use 1.0 for fuel tank testing performed at 28 °C and 0.60 for testing performed at 40 °C.
40 C.F.R. §1045.706