Cutting Torch (Rosebud) Help Needed

I disagree with your engineers accessment of the problem. Why?

Backfire is 99% caused by to much fuel being supplied for a too small of a orifice size, ie; using the wrong sized rosebud or cutting tip for the amount of output heat required. This is the first indication that the mixing chamber pressures are NOT set correct and the pressures are set too high for the given orifice size.

All cutting/heating orifices have a designed pressure rating that's stated from the mfg as the orifice tip body is cooled by the gases flowing from the orifice while in use.

Exceeding the designed orifice pressure rating will cause the ignited acetylene gas to leave the face of the tip body, thus at the same time the flame will add excessive oxygen (oxygen that is obtained from the surrounding air) to the actylene gas that will cause the flame to momentary extinguish, then as the mixed gas cools it reigintes and causes a small explosion as it reignites thus you here the "bang" or poping noise and this condition is called backfire and can be very dangerous.

When the backfire is not corrected by lowering the fuels pressure or volume, acetylene being the fuel in this case, then another EXTREAMLY DANGEROUS condtion will occur called flashback.

Flashback is where the flame that contains oxygen and fuel, is sucked back inside the mixing chamber and will cause a EXPLOSION if not quickly corrected by shutting off the source of oxygen and then shutting of the fuel. Turn off the cylinders in that order as three conditons are generaly considered to cause a explosion, that being oxygen, fuel and a source of ignition.

I strongly urge you too research more information for your safety.

I added volume to my descriptions as well as pressure because there are some fuels that can explode under the same contions without any warnings as I described above.

Please read several of my posts on how to correctly clean and set pressures on cutting and brazing tips.

T_Bone

How do you know if you are drawing acetone out of the acetylene tank? This is something I always worry about, because my rosebud is right on the edge of being safe to use with my tank.

For the other users, please do not respond to Dave or my coments to each other as this concern is between us.

I disagree with your diagnose and cure of the problem for several reasons as stated in my reply to Tom's engineers info and Please read my thread titled "Cutting, Brazing and Rosebud Torch Misconceptions"

As you stated in past threads that you harbor bad feeling toward me. I personaly do NOT have any bad feelings toward you.

When I see what I think is a mistake, I will make a comment with the reason of why I made the disagreeing comment. I would hope you would do the same with me or others as to me that is having a conversastion, not criticism.

The reason I did not respond to you in the other forum, is that you stated #1 and I replied to #1 with my comments. You then replied to my comment that stated your same thoughts in #1. Rather than sound like a argument, I choose not to recomment as we both were not going to change our thoughts on the subject.

I've enjoyed your posts on this forum as well as other forums and hope this settles any ill feelings you have towards me.

T_Bone

I'll comment on your above post just as soon as I can search the archive to remember exactly what was said.

I don't remember that I ment that, intent when replying too you. I could have typed something that could have been taken wrong and why I want to reread it.

The ytmag website is only working part of the time for me, so it may be a day or two.

I did include my e-mail if you would like to respond.

T_Bone

I just heard back from the ytmag admin and due to some unforseen server problems that effected the archives, I will not be able to research the thread(s) in question.

I do not ever remember saying anything to you about any welding related question, in fact I believe this is the first post of yours, that I've ever replied too. ???

What I remember about the feedback comment, was you had posted something that could be considered againist the ytmag forum rules. Since you were fairly new to the fourms at that time, I did not want you to loose your posting privillages, of which I have nothing to do with as some people suspect. I'm a ytmag user just like anyone else.

I believe there are two ytmag website Admin's, Chris or Kim.

Kim, the website owner, had explained in a few pages back on the feedback forum, as that forum had just came on-line, the guide lines for the use of that feedback forum and the way that I had taken your post, "IMO" was very close to what Kim had said would not be tolerated thus I didn't want you to get into trouble. Maybe I miss-read your post intent. But my intent was to help you, not harm you, by refferring you to Kim's thread for you too read.

I will say that I have never posted any thread in 10yrs on ytmag that I intentionally bad mouth or called a user down as this is againist my teaching beliefs as well is againist the ytmag user forums rules.

If you ever have a thread that someone belittled you or out right called you down or you felt that way, then you can: as you open the post to read, on the left side column, click on "report post to moderator", and that will open your e-mail with a refference to that post that you can send to ytmag admin for removal if admin agrees. All users can do that.

As I have stated, I will enter into a dicussion when I see a post that is contrary to what I have been taught or had a personal experience in. I can prove everything I say when it comes to certified welding, AWS codes, refrigeration or HVAC, unless I had a brain$art :), as I'm very experienced in the fields I listed and I have extensive accredited refference texts available to me for research.

Yes I do make mistakes, some I catch, some I don't, and I'm not perfect. I surely hope I don't leave anyone with the feeling that I'm perfect when I post information as that's every teacher's nightmare, ie; when you loose the students attention for whatever reason.

In the future, if you ever feel that I made a post that could be taken derogatory too anyone, please bring it to my attention so I can rexplain myself or make corrections.

Reguards,

T_Bone

Or what I've done(if you can't hold it at an angle) is keep a bucket of water and dip the tip when it happens, then light back up and keep heating.

Your mixture was right or it would've done it right from the start. Just a hot tip is all.

Doug N