Classification society DNV GL has awarded Tenneco two Approval in Principle (AIP) certificates for selective catalytic reduction (SCR) systems.
The AIP certificates cover key components of the system including the dosing and control unit, injectors, load sensors, and the human machine interface (HMI), remote monitor, as well as catalyst and reactor hardware configurations for International Maritime Organization (IMO) Tier III applications.
The high horsepower SCR systems have been designed to meet Tier III nitrogen oxides (NOx) reduction requirements, which will enter into force from 1 January 2016 as well as US Environmental Protection Agency (EPA) Tier 4 requirements. The modular design enables integration into a range of engine sizes and works with both electrically or mechanically controlled engines. Airless urea injection, a Human Machine Interface (HMI) that can be accessed on the front of the fluid delivery box or remotely via a touchscreen tablet are featured, as well as real time feedback of NOx reduction performance and urea concentration. In addition, more than 100 parameters including urea leakage, sensor faults and backpressure are monitored.
Over the past year a series of validation tests have been carried out by the company to assess the system’s form, fit, function and performance. In partnership with the Texas A&M Maritime Academy, Tenneco conducted saltwater sea trials onboard the TS General Rudder in the Gulf of Mexico and installed an SCR system on a 33-year old 800 horsepower Tier 0 engine providing NOx reduction sufficient for US EPA Tier 4 marine emissions requirements.
Furthermore, the SCR has been awarded product design classification from ABS and has been designed to meet requirements from China Classification Society (CCS), Korean Register of Shipping (KR) and ClassNK.
