MARPOL Annex VI - NOx Tier II Limit

Contents

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.

Formula

$$ NOx = \begin{cases} 14.4 & n < 130 \ 44 n^{-0.23} & 130 \leq n < 2000 \ 7.7 & n \geq 2000 \end{cases} $$

Symbol	Meaning	Unit	Source
$n$	Rated engine speed	rpm	engine nameplate