JHCC Posted November 5, 2018 Share Posted November 5, 2018 I'm in the process of building my first gas forge, which will be a basic helium tank (lined with ceramic wool and hard refractory) and one of Frosty's Naturally Aspirated Ribbon Burners (described HERE). So far, I have completed all the metalwork and am awaiting shipment on the refractory. I have filed the MIG tip so that it projects just under halfway into the run of the T, and it will certainly light and sustain a flame. My question is this: while Frosty's T Burner Illustrated Directions give very good information on how to tune a T-burner for use on its own and the NARB instructions have good info on the number and size of the holes in the multi-port outlet block, it's not entirely clear to me how and when a T-burner for use in a NARB should be tuned. Should I tune the T-burner as described in the standard directions before attaching it to the rest of the NARB? Since I've already welded the thread protector to the plenum, can I do this with just the nipple, or should I get something to temporarily increase the length of the mixing tube? Or should I do the tuning once the multi-port block is cast and cured? If so, what should I be looking for? Quote Link to comment Share on other sites More sharing options...
Latticino Posted November 5, 2018 Share Posted November 5, 2018 I'm sure Frosty will elaborate, but the ribbon burner outlet will certainly provide more backpressure/friction than an open ended full size port (even with a diffuser plate). I would expect to have to tune it again after the burner is complete. Quote Link to comment Share on other sites More sharing options...
Buzzkill Posted November 5, 2018 Share Posted November 5, 2018 I used the same T, mig tip, and mixing tube that I had used for my "standard" T burner. Although I experimented with different lengths of pipe nipples and different sizes of mig tips, I ended up back at my original configuration. My impression is that the ribbon burner runs slightly richer than the original T burner, but it still hits welding heat, has a wonderful range and a very stable flame. The number and size of the outlet holes creates a balance so there's not a huge amount of extra back pressure, but there's no doubt there has to be a little bit more. With all that in mind I'd recommend starting where it was tuned well as a single outlet burner and then you may or may not have to tweak it a bit with the ribbon head in place in the forge. Quote Link to comment Share on other sites More sharing options...
Jasent Posted November 5, 2018 Share Posted November 5, 2018 I would agree with buzzkill but I have not messed with my T burner fed narb for a while. Prob get back at it this winter so I’m tagging along to learn from your mistakes lol Quote Link to comment Share on other sites More sharing options...
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