In reference to your black pipe burner, yes! I have had some experience with building them. I drilled holes, which is not the easiest route to use, that would get plugged and require re-drilling every 3-6 months, because they would get plugged with ......gooo..! Look on youtube.com, they have a few like mine on there, that I am in the process of redoing this winter. I get the heat and good flame, but once they start plugging up, its not as efficieny and here is the chance of getting a lot of soot.
With the new ones I am building, instead of having 300, 3/32" drilled holes, every 1/8" apart, I am going to use a sawzall and cut slits in the top 1/3 of the pipe, 1" apart. The venturi and orifice design I used to use, I am modifying that slightly also. I am using a .030" mig welder wire feed orifice, as my propane orifice. That will go between a brass fitting that your propane hose connects to and the venturi where you cut and/or drills holes for oxygen. There again, I am going off of a video I had seen on youtube and applying it to what I have already found out on my own over the last 4 years.
You can look at my website, jimmyraysbarbq.com,, it shows my grill and foodtruck setup. If you go to my facebook page, jimmy ray's bar-b-que, you will see a few of our past events we have catered to. My facebook page, if interested is jim parker. It has a pic of the side of my truck. There are a few on there. Thats how I tell people to recognize as my page.
If you have any further questions, I would be glad to help out if possible
Good luck
Jim