Removing the O-Ring from a Delavan Siphon-Nozzle Oil Burner

Discussion in 'Burners and their construction' started by PatJ, Sep 17, 2018.

  1. PatJ

    PatJ Silver

    I like the way my siphon-nozzle burner without the o-ring is functioning, and but I would like to be able to leave the burner outdoors for several days in a row without worrying too much about corrosion, so I am going to replace the mild steel muffler pipe with 304 stainless tube.

    I bought a couple of pieces of stainless tubing, and the dimensions are:

    2.5" OD
    2.26" ID
    0.12" thick wall
    304 stainless tubing annealed

    I bought it from Speedy Metals.
    https://www.speedymetals.com/pc-4498-8276-2-12-od-x-120-wall-tube-304-stainless-steel-annealed.aspx

    They offer a 0.065" thick wall tubing, but I thought the 0.12" wall would be much easier to weld with a nickle rod.
    I also think the heavier wall will help maintain a more accurately round shape, which will help getting a good seal at the tuyere.
    And a heavier wall will allow things to be clamped to the tube without risking deformation of the metal.

    I think the interior burner parts that I have will slide into this tube, since the old burner also used a 2.5" diameter tube.


    rImg_2013.jpg


    rImg_2015.jpg
     
    Last edited: Nov 30, 2018
  2. PatJ

    PatJ Silver

  3. PatJ

    PatJ Silver

    I used the pipe fitting program to make templates for the pipe joint.

    I used a 30 degree angle, and selected "Perpendicular Cut" for both the header and branch pipe cut types.

    I will print the branch template, cut the branch pipe first, then fit it to the header pipe exactly probably using some light sanding, and then use a sharpie to draw the outline for the cut in the header pipe.
    If I can get the fit accurate enough, I may silver solder the two pipes together, or I may not since that may prevent me from welding on either pipe in the future.


    SS-BURNER-TUBE-04.jpg


    SS-BURNER-TUBE-01.jpg


    SS-BURNER-TUBE-02.jpg


    SS-BURNER-TUBE-03.jpg


    SS-BURNER-TUBE-05.jpg


    SS-BURNER-TUBE-06.jpg

    .
     
  4. PatJ

    PatJ Silver

    There was a neat spin vane on the other forum that was laid out flat on sheet metal, I think water-jet cut, and then the vanes bent into shape so that it fit inside the tube.
    Anybody remember where that was exactly?
     
  5. joe yard

    joe yard Silver

    I have been playing with a air brush type compressor. With a 2 MM Chinese suction nozzle it picks up around .75 gallons an hour and develops a very fine mist. I have not tried to pressurize the fuel to the air brush compressor. I will be trying a pressurized fuel system soon just to see if such a small compressor can get 3 G.P.M. to mist.
    Although I have not tried the pressurized fuel yet. I am hopefully that I can get a spray rather than a stream. With just the vacuum from the nozzle the mist was very fine and would have easily lit. If all works out I would light the furnace with the .75 G.P.M. with a fine mist, them bring up the fuel pressure to the required G.P.M. and a coarser spray.

    Joe compressor.jpg
     
  6. PatJ

    PatJ Silver

    The iron melt I did the other day ended up with a 2.75 gal/hr fuel flow, and I really think I could have easily done the same thing with 2.0 gal/hr, or possibly even less, perhaps as low as 1.5 gal/hr.

    I am finding out that getting full combustion of a lower flow rate is far more important that getting partial combustion of a higher flow rate.

    The very first siphon nozzle burner that I made was actually a $20.00 paint sprayer, and it would produce a big flame.
    The only reason I did not use it was because I could not figure out how to fit the nozzle parts into a burner tube.
     
    Last edited: Nov 30, 2018
  7. DavidF

    DavidF Administrator Staff Member Banner Member

    I dont know, It looked like you had it really dialed in.... I would be curious to see what happens if you do cut it though.
     

Share This Page