MARPOL Annex VI - NOx Tier II Limit
NOx emission limit for Tier II per MARPOL Annex VI Reg. 13 as a function of rated engine speed - the baseline cap for keel dates ≥ 2011-01-01.
NOx limit Tier II
14.40g/kWh
Formula, assumptions, and limits
$$NOx = \begin{cases} 14.4 & n < 130 \\ 44 n^{-0.23} & 130 \leq n < 2000 \\ 7.7 & n \geq 2000 \end{cases}$$
Tier I 17/45/9.8 respectively; Tier III (ECA only) 3.4/9·n^-0.2/2. Measured per E2, E3, D2, C1 cycle as appropriate. Test on IMO NOx Technical Code 2008.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $n$ | Rated engine speed | rpm | engine nameplate |
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