Page 43: of Marine News Magazine (July 2016)

42 44

PROPULSION: TECHNOLOGY we harmonized all of that together to ? nd the best solution. We optimized the size of the unit to meet the emis- sions requirements of the client. This amounted to 82 pct reduction in

NOx,” said Mossey.

SCR targets NOx emissions. DOC targets CO emissions and can have a bene? t with PM reductions. All se- lective catalyst systems utilize either ammonia gas or urea. That some- times gives operators concern – un- warranted concern in most cases, as it turns out. Because the ferries aren’t running long cruise distances, the op- erating pattern of the vessel combined with relatively low urea consumption means that there’s not a lot of require- ment for storage on the vessel.

Mossey says, “The customer could replenish urea daily, if required. The vessel is con? gured for two 70 gallon tanks; one in each hull. At periods of low loads on the vessel – alongside as in the case of most ferries, you are producing low NOx emissions and typically not dosing at that point.

And, when handled by the crew, it’s a fairly passive product, unlike diesel or other fuels.”

Producing Results with Proven Partners

Credit: PPG

The ? rst of two vessels is expected to be delivered to WETA by Thanks- giving of 2016. With a host of well- known names involved – Hug, Vigor,

WETA, Nichols Brothers, MTU, and of course, PPG – the project is com- ing together as planned. That’s not 3030 E. Pershing St.

surprising, given the long history of

Appleton, WI 54911 USA collaboration between the client, the [email protected] service providers and speci? c OEM’s.

When it is all said and done, the air www.appletonmarine.com in San Francisco Bay will be a little

Phone: (920) 738-5432 cleaner, well ahead of schedule. Pro- active planning was the key and PPG

Fax: (920) 738-5435 helped to pull it all together.

43 www.marinelink.com MN

MN July16 Layout 32-49.indd 43 6/20/2016 4:14:31 PM