Nett’s Tier 4 marine retrofit system
By Mike Brezonick15 July 2021
Nett Technologies Inc., the Canadian manufacturer of engine emissions control systems, announced the completion and installation of a Tier 4-compliant retrofit aftertreatment system on a 2000 hp tug operating in San Diego.
The BlueMax Nova 320 system is engineered specifically for marine applications and incorporates a selective catalytic reduction (SCR) system, an active diesel particulate filter (ADPF) and a diesel oxidation catalyst (DOC) system into a single module. The system provides 95% NOx and 95 to 99% PM reduction and reduces carbon monoxide and hydrocarbon emissions by more than 98% and 82% respectively, the company said.
Nett said the BlueMax 320 Nova system was adapted from a verified CARB-approved system that demonstrated its effectiveness in hundreds of stationary diesel engine installations. The system has been custom-tailored to fit tight marine applications without hindering the performance or stability of the vessel and provides vessel owners faced with more stringent emissions regulation an alternative to engine repowers, the company said.
“Our compact SCR system was designed with the confined engine room in mind,” said Misagh Tabrizi, product manager at Nett Technologies, Mississauga, Ontario, Canada. “As a result, the BlueMax Nova 320 emission control solution will provide our customers with the lowest operating cost and, more importantly, lower additional net weight.”
Through the Technology Advancement Program (TAP) sponsored by the Ports of Long Beach and Los Angeles, the system was tested on the San Diego tug. Development and testing was done in collaboration with the Pacific Marine Group,