Home Made Forge Made From Gas Tank





Introduction: Home Made Forge Made From Gas Tank

As mentioned in my last instructable Fire extinguishers are amazing and mostly free. What we will be building today is a home made forge capable of melting stainless and we tried glass but it just went mushy.

Shopping list:
Gas tank empty (free)
Gas tank full (have)
Fire extinguishers (free)
Welder (have)

Step 1: Empty Gas Tank Clean Clean Clean

We attached our gas tank to a BBQ and burned off the last few minutes of gas tank.
Then put a regulator on hung it upside down and turned it on.
Drill small hole in top BE CAREFULL
Drill another hole in bottom

The tank will be quite full with gunk that smells really bad.
To clean it out we then made these holes much bigger then put lots of boiling soapy water washing out threw the gas tank.

Step 2: Building Forge

We marked out a line along the top of the bbq and using saw we put off the top this is going to be our lid that we welded on using a hinge.
This is now our main holder for the forge.

Step 3: Setting Up the Holder

We packed the sides with engineer bricks we are using bottom of fire extinguisher for our melting pot.

Step 4: Flare

What we did here for the flare was put a small 10mil pipe threw to another larger pipe sealing off one end. You will need a 1.5 to 2 hole going wards the front of the top of gas pipe.

The theory is that when you pump gas throw the small pipe and then down into much smaller hole you are injecting quite a large amount of gas to small hole. The hole is back of tube pulls air in mixing with gas.

Step 5: Meliting Stuff

Took around 25 minutes to melt first block of aluminium and then took another 5 minutes per extra bock we added. we have break down of build under images below.

Step 6: Casting



    • Science of Cooking

      Science of Cooking
    • Pocket-Sized Contest

      Pocket-Sized Contest
    • Paper Contest 2018

      Paper Contest 2018

    We have a be nice policy.
    Please be positive and constructive.




    Where can I find an old fire extinguisher? I want to make this project. I have everything else except the extinguisher.

    Scrap yard. Great place for all these things.

    You may want to re-title your instructable so that people will be able to find it. What you built is a "foundry furnace", a forge is a little different, it is for heating metal for hot working (i.e. forging). They work a little differently, forges typically aren't any good for foundry work and foundry furnaces are no good for forge work.

    I read this and totally agree with you. You are giving great advice and it is really helpful. Thanks a lot for sharing your thought with us. Keep posting nice information.


    I didn't clean mine before cutting, is that a problem? I mean beyond it really stinking.. I think i've burnt the smell out of it now anyway.

    Thanks for the suggestion. Its really helpful.


    Thanks for the suggestions. Its really helpful for tank clean.

    [url=http://pumpcoseptic.com/]Septic tank pumping and cleaning[/url]

    I think it takes about 4 days to anneal that piece at 973 farenheit. body centered cubic. The next layer sits in the space. One time i melted too much. i tried to pour an aluminum lathe.i have several from ebay. I went to oakland forge. they were making cast iron valves. I went into a building with no sign of melters. I could hear something switch every few minutes. Another building had an arc furnace. One building had an induction furnace. One had a large pot with a heavy lid and gas. I made a heat exchanger which works somewhat. i could not quite melt brass. charcoal will melt small blobs of iron. I will try the next step. Can you guess what it is?

    you mean aluminium... not stainless - right?