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Wartsila’s User Group Forums 50 SG Engine HUG Catalyst Life Expectacy? Reply To: HUG Catalyst Life Expectacy?


For Humboldt Bay our first ammonia slip catalyst went bad 5 years after commissioning and approximately 21650 on the engine.  We find that the number of starts affects the failure time quite a bit.  And of course, operating temperature.  Even though we operated below the high temperature we found the catalyst degrades rapidly at the higher temperatures.

The sequence of events is as follows – ammonia slip fails first.  Followed shortly by the CO catalyst – however, a row of CO catalyst can be added to bring emissions back into control.

The SCR catalyst fails next and a row is added to regain emissions.

I’d be happy to discuss via phone if you’d like – 707 441 2667.