Author Topic: A beginner makes a burner  (Read 1166 times)

Offline Joco

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A beginner makes a burner
« on: March 29, 2018, 08:29:37 AM »
A little show and tell on an LPG (propane to some) burner I built in preparation for a home forge based off a 9kg (5 gallon) LPG bottle.

First some various bits and pieces to be made use of ...
Pressure controllable valve


One of two fittings for the 5mm ID gas hose.  Notice the "fun" ball end that creates a gas seal.


MIG tip for 0.6mm wire.  M6 threaded into some M8 2mm wall copper tube.


black pipe nipple.  Some work has been done on this, one thread removed, the other will eventually be removed as well. Hit with a wire wheel, inside has been "reamed" with a 15mm drill to nock the worst of the weld seam off.


Now starting to make some of the brass fittings for th gas feed into the accelerator. This fitting is designed to mate with the ball ended hose bard from BOC.  This barb is for the 5m of gas grade hose I got.  The ID is 5mm which is just odd enough to not be able to take the standard 6mm barbs typically for sale in these parts. Starting brass is around 19mm from memory. The thread is 5/8-18 and the inserted area is a 60 deg taper (30 deg off center line).




The other side of this fitting is tapped BSP 1/4-19 and a standard BSPT 1/4 nipple is installed.


A gas grade ball valve is added along with another BSPT 1/4 nipple and another custom fitting that supports the copper pipe which will be threaded M8 into this custom adaptor.


Accelerator tube installed


The next step is the creation of a busing style coupling that the accelerator is inserted into with a close slip fit and which will be inserted into the burner tube.  The intent is to allow this same accelerator to be used in this 1/2" burner and also into a yet to be built 3/4" burner.


So ... time to start on the burner tube.  The 1/2" black pipe is mated with a 20mm ID galv section of pipe which will be the air control sleeve.


The ait slots have been made in the burner body, the control sleeve has been bored to size and the accelerator adaptor bushing sized to fit pipe.


The flare is created using some SS pipe kindly donated by Bruce E.




Some more work and the burner tubing all done.


And now on to th test firing.  This has been done at night so you can actually see the flame. In normal sunlight its basically invisible.


James
Wellington - NZ