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I thought stoich 17.4:1 is valid for gasoline fuel (??) I just posted the engine spec.http://files.engineering.com/getfile.aspx?folder=e1e68a30-b321-4d30-832d-dacf269631cd&file=7013_0710.pdf

So I just got informed, the AFR is 4.5 (natural gas engine). What does it mean? Is it stochiometric, rich or lean? Where can I reference it to? thanks EP

we still discuss the possible causes, today or tomorrow we will visit the engine for more investigation. I'll try to get it as soon as possible, whether it's rich, stoich, or lean burn. thanks

Yes, I meant natural gas engine. Sorry if I made some confusions.

Okay, I got it, I was wrong from the beginning "Because I think: lower fuel pressure --> leaner Burn --> lower temperature higher fuel pressure --> richer burn --> higher temperature" ---> this is WRONG It should be the opposite! Lean Mixture --> hotter combustion gas temperature "Lean...

sorry, but i don't really understand. how can lean mixture cause the sequence and cracking? really appreciate your responses. Thanks EP

No?? Because I think: lower fuel pressure --> leaner Burn --> lower temperature higher fuel pressure --> richer burn --> higher temperature Any suggestion(?) Thanks EP

So.. I went to read the reading sheet of the engine, and I found that the exhaust temperatures were around 1200-1300F. It is 100-200F higher than the design temperature (1120F). does the fuel pressure play a big roll? The design fuel pressure states 25-50PSI, and our engine ran with the max...

The question is, are these causes, symptoms, or both? --> I got the indications from the alarm list, so i would say, it was symptoms. Did your coolant levels drop because of overheating, or did the low levels make it impossible to cool the engine properly? --> I think it was the first one. The...

I'm having trouble with our gas engine (recip). It was shutdown because of the following indications: 1st. Engine overspeed 2nd. Turbocharger temp high high 3rd. Exhaust manifold temp high high 4th. Jacket Water surge tank level low 5th. aux water surge tank low and we found that there are...

i think i need some times to read that. thanks to you pmover.

thanks for all the helps. I'll go get the new map! mfg, EP

Hi, I want to ask another question that will boost my understanding up about this whole performance map. (hopefully) I now understand that gas with different MW or SG (if it out of tolerance off-course), should have different performance map. my question: if the situation I explained above has...

Thanks David and -pmover it's very helpful. gruss, EP

Please give your opinion about my explanation below. Is it correct? The situation is: on the actual operating performance: The compressor needs to run on 13485 rpm in order to achieve the expected flow of 9328CFM with the Hisen of 64678 ft-lbf/lbm. ideally (according to the mfg performance...

Hi everyone, this is my first post. I hope we can help each other out. I have problem on plotting the actual compressor performance on manufacturer' performance chart. Can someone guide me? Please see the attached file for detailed information. Thanks, EP