DNV GL updates NOx TIER III compliance guide for ships


Norway-based classification society DNV GL has unveiled a new brochure featuring updated guidelines for designing ships in compliance with the International Maritime Organisation's (IMO) Nitrogen Oxides (NOx) Tier III requirements. 

The new brochure also provides guidance on various considerations that need to be taken into account during the newbuild planning stage of the ship's construction.

Additionally, the DNV GL brochure offers shipowners an insight into the implications of using different technological solutions for reducing NOx emissions, as well as ways to fulfil the NOx Tier III requirements.

DNV GL noted that its new brochure will enable ship operators to select the optimal solution to ensure compliance with the NOx Tier III emission limits.

The optimal compliance option will depend upon various factors such as a vessel’s individual trading pattern, engine size and speed.

"DNV GL noted that its new brochure will enable ship operators to select the optimal solution to ensure compliance with the NOx Tier III emission limits."

In addition, the new brochure contains information relating to selective catalytic reduction (SCR), exhaust gas recirculation (EGR), the use of alternative fuels, internal engine modifications, direct water injection (DWI), fuel-water emulsion (FWE) and intake air humidification.

It further discusses the various operational and financial benefits of installing NOx Tier III-compliant technology on-board ships.

IMO’s NOx Tier III regulation came into effect in the North American and US Caribbean Emission Control Areas (ECAs) on 1 January last year.

The new regulation aims to enforce stricter limits on the acceptable amount of NOx emissions from a ship's engine, reducing the permissible amount by roughly 75% compared to the previous NOx Tier II limit.