We have 4 18V50 SG engines and we have had several problems that lead us to believe the engines were not tuned correctly. Dave Mordecai and Pat Faircloth have already posted about the MFI trips we have been having.
We’ve also had many failures of the HUG SCR measurement system and the HUG rep noticed there was a lot of ‘soot’ in the sample lines. After this, we also noticed that the raw NOx from the engines is not stable. On one engine it varies from 150 ppm to 130 ppm when there is no change in load, fuel gas pressure, charge air pressure or any other combustion parameter we can think of.
Are other users seeing the same variation in NOx from the engine? Anyone else have soot in the HUG systems?
I have a trend of our NOx if anyone is interested, send me an e-mail.