venturi/blower conversion

J. Neilson

J. Neilson

Joined
Feb 6, 2001
Messages
3,621
I've been talking to George about forges and possibly converting my two-burner venturi to a blower forge. The idea I have should work (I have George's backing) but, I wondered if anyone has tried this.
venturi-blower.JPG

Sorry 'bout the bad picture. I'm obviously no artist. Anyway, the "bulbus" connecter that the burner passes through has an opening for the venturi effect. This opening is threaded. I figured on connecting a pipe in each burner with a couple elbows and a t-connecter to join the two and putting a blower in. The air will enter behind the burner tip, just before. Any opinions?

I still want one like George's though. No one was waiting around long for billets to heat.
 
It looks like it should work. I have tried something like that and it worked fine .......after I made a flare for the front of the burner. Don't ask me why it needed it but it did.
 
J. next week I will take a junkyard run, to see if they have pipe the size as my small forge. Then we can my plans to come on down. It will take 3 to 4 hours to build.;) ;)
 
I think I can grab some scrap pieces of 8" pipe from work, if I do, I'll bring them to the show on Saturday.:D
 
Here is a listing. Larry that will be cool. Don't forget we will only be there in the AM.
Forge Parts

Blower Part # 16-1032 $18.99
Vendor Surplus Center
Phone Number 800-488-3407

Black Pipe

1.5 inch
Nipples
6” & 4”
90 deg. Elbow
Coupling
¼ nipple 6”
¼ cap
2 sets of ¼ inch quick disconnects with o-rings
8’ of hose

MSC (800) 645-7270

Page # Item # Description $$$$

3341 8557803 Nuline Regulator $20.89

4030 00075929 Needle Valve Female $20.32
(1/4 NPT )
 
Gentlemen,

I'm no expert, but I've done a lot of reading on this subject as I am in the same boat. I've got a venturi burner that I will some day change to a forced-air unit. My understanding is that you need to have some way to get the fuel and air components mixed properly and you need to get the "flame-front" stabilized. One way to do this is to use a flare. Another way to do this is to use a 90 degree elbow and another short piece of pipe that goes into the opening of the forge. Take a look at Don Fogg's setup. Lonnie Hansen uses this same type of burner and it get's his forge welding hot in just a few minutes.

Another way I've seen is to add two reducers and a piece of pipe that is larger than the rest to add a "bulge" in the burner tube. This reduces the velocity of the air-fuel mix and produces a "mixing chamber". Does that make sense? Here is the picture.

Finally one more way I've heard mention of is to add a piece of flat metal that has been twisted to the inside of the burner so that the fuel and air spin inside the burner tube and mix better. I've never tried this and I cannot vouch for it's effectiveness.

I hope this helps! Have fun and be safe. :)

- Mike
 
IG,

Got 3 pieces of 8" sch40 pipe, pc. are 14", 11 1/2" and 9", can you use them?
I'll be at the show probably before 9AM.
See you there
 
I'll take what ever you are not going to use. See you in the AM. Will be there between 9 & 9:30.:cool: :cool: :cool: J: can have his pick.
 
As far as mixing the air and gas, just add 6 to 7" of an ole wood bit, down the center of the burner. Works for me.

Ken Beatty
 
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