More Gas Burner Experimenting
by John
First I tried the Sievert 2943. I tried different gas settings, and different positions of the burner in the fire box. I quickly discovered that an opening had to be present next to the supporting flange. Despite that, steam was produced in 10 minutes, and 20psi was achieved in 15 minutes. My aim is to obtain 40psi, and maintain 40psi during engine operation.
Unfortunately this burner does not work if there is any significant back pressure in the system. Stuart has advised me to try the Sievert 2954 which he says will cope better with back pressure. The Sievert 2954 has a similar appearance to the 2943, so I have not photographed it.
I have borrowed a Sievert 2954, but it needs some setting up, so I thought that meanwhile I would try a burner style which had been mentioned earlier. It is a tube with multiple transverse slots. Despite being constructed rather roughly and quickly, it produced a good hot flame. Perhaps a bit small, but promising.
If the next Sievert is not satisfactory I will come back to this style, and experiment with different slot numbers and sizes.
If you are becoming a bit bored with all of these gas burner experiments, I understand. When the burner is finally sorted I will be delighted and relieved.
I have machined some wood to be used for lagging. It is West Australian Jarrah. A dark coloured wood which is often used for exterior flooring. I will apply it to the boiler soon.
johnsmachines 
Hi John,
Ilike the look of the flame in that image of the slotted burner it may be what i will want to make fot a burner in that boiler that I picked u a couple of months ago.
if you get back to playing with that design i would love to know what diameter of tubing you settls on, the size slits, spacing & etc…
i lookforward to your next installment of “Burner Madness”
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“Burner madness”. I like it! Expect to see it as a heading soon. And yes, I will publish the final specs. John
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G’day John
I found some old model eng mags and found some designs on line. I was tying either a slotted tube or blow lamp burner to go in a marine boiler flue- I was also experimenting to find what dia the flue should be. I tended to get a flame that would look ok, but noted some further flame at the exhaust, so some of the gas was unburnt. I shelved the project after a few iterations.
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Too much gas? Maybe smaller jet?
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I tried a few iterations, but there are so many variables that I’ve gone back to the drawing board. I fiddled with jet size, jet location with respect to the primary air entry holes, size of those holes, secondary air.
I had designs that looked great on the bench, looked great in the flue, but if you turn the lights off, there was still some burning outside the mocked up boiler. Attempts to get more air in produced a burner that was hard to light.
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Understand. Doing all of that at present.
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