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Thanks to all here, I've managed to get a copy. Well done to the Forum members again, keep it up!!

Keep saying it CSA, they will get the message eventually.

Good comments Venkatesh but we don't have an answer to the A.A. question and the original poster has never answered the question. (To Astrid RamA­rez: How about some more info. on the use of A.A.for the group.) Like you, I am suspicious of a back fire during DLN staging.

Please check here for pictures : glenmorangie69.imgur.com/all/ Can someone please verify if you can see the images. <b>Moderator's Note:</b> Yes, link works. I clicked on the first photo and the page showed all the photos.

Well, you have read all the discussions, what do you think?

Hi CSA, I'm glad you joined in. I know it doesn't sound possible, but if the system went into transfer with purge valves still open, then there is a low pressure path for combustion gases to back flow. Also the fact of using A.A. instead of purge air is suspicious if no changes have been...

Hi, I don't think we are looking at a gas leak. We are looking at a combustion blow back into a gas pigtail/manifold, possibly caused by a purge valve problem of some kind. Maybe allowing combustion backflow when the purge valves should have been closed.

Give me a few weeks and I should be visiting some 9FA series III brand new machines.

Thank you for the Photos. It surely looks like that you had combustion back into the gas pigtails. I've never seen this happen on a DLN machine but I have seen this happen on a standard dual fuel machine running on gas when the A.A. compressor failed and combustion gases developed back in the...

Another question for you to answer. How long have you been using A.A. for purge? Is this the first Lean-Lean to Premix transfer you have made using A.A. or have you done it successfully before?

Here you are [email protected]

> Are you sure that using the A.A. Compressor as Purge Air is OK? It > kind of sounds like you got combustion flow back into the Secondary > flexible/manifold. Who said that you could use A.A. instead of > Purge Air?. Do have any data from Trip History etc.? Some further thoughts after...

MKV panels have typically always produced a high frequency sound. Some people can hear it, others cannot. I guess that is age as your high frequency drops off. I wouldn't be too worried about it as you say "no alarms,no diagnostics." I don't know about the blinking LED, any ideas anyone?

Are you sure that using the A.A. Compressor as Purge Air is OK? It kind of sounds like you got combustion flow back into the Secondary flexible/manifold. Who said that you could use A.A. instead of Purge Air?. Do have any data from Trip History etc.? To allow further analysis please post more...

Can you clarify please, did you say that L.O. circulation was off for a couple of hours?

To answer your question the first thing we need to know is how are you controlling your compressor load (suction pressure, discharge pressure, or what?). Normally, if you are controlling on Discharge pressure, and the scenario that you explained happened, then the system would see the...

Thanks for that. I wasn't being critical just curious to see if you found a solution. Good Luck in your search, keep posting.

Can we get a little more detail on exactly where the problem was? It would be useful for us all.

Great stuff CSA. When I run training courses, I tell trainees exactly the same. It is amazing the number of people who think that they know their system but you then find that they haven't even looked at their P&IDs. Your reply should be a sticky for anyone who is learning trouble-shooting!!