NOx Tier Compliance Check
Determine the applicable NOx Tier (I, II or III) under MARPOL Annex VI Regulation 13 from the engine's installation date and current operating area, compute the rated-speed-dependent limit, and compare against the EIAPP-certified NOx emission rate.
Formula, assumptions, and limits
| Symbol | Meaning | Unit |
|---|---|---|
| Maximum permitted cycle-weighted NOx | g / kWh | |
| Engine rated rotational speed | rpm | |
| , | Constant limits at low / high rated speed | g / kWh |
| , | Tier-specific coefficient and exponent for medium rated speed |
Source: IMO MARPOL Annex VI Regulation 13; IMO Resolution MEPC.176(58) - Amendments to MARPOL Annex VI (revised Annex VI with the 3-tier NOx framework). 10 October 2008; IMO Resolution MEPC.177(58) - NOx Technical Code 2008. 10 October 2008; IMO Resolution MEPC.272(69) - 2016 Amendments to the NOx Technical Code 2008. 22 April 2016; IMO Resolution MEPC.286(71) - Baltic and North Sea NECA designation. 7 July 2017; IMO MEPC.1/Circ.795 - Unified interpretations to MARPOL Annex VI. 22 May 2015
In short
Determine the applicable NOx Tier (I/II/III) under MARPOL Annex VI Reg 13 from engine installation date and operating area, compute the rated-speed-dependent limit, and compare against the EIAPP-certified value.