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Cutting torch---propane

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wvbill

04-30-2003 15:36:58




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At an estate sell,i saw a cutting torch with the large oxeygen bottle and a propane bottle instead of acetalene. An old man there said it worked as good as acetalene and was away cheaper..if so why couldn't you just use natural gas,,how much presure does the torch have to have to work?? Thanks for your ideas on this one.bill




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John A.

05-01-2003 21:14:40




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 Re: cutting torch---propane in reply to wvbill, 04-30-2003 15:36:58  
wvbill, What you are talking about is very complicated.
1 Taking natural gas , then Compress it making CNG (compressed natural gas) A. Very coplicated and very expensive to do. B. There arn't enough BTUs / tank full to justify the price it would comand. C. Upkeep & maintence is out the roof for compressor. (biggest problem next to BTUs) D. An o2 bottle, standard size on most ox-act rigs, if filled with CNG ,as apposed to LPG would power a pickup only about 12 mi. E. Some cities have tried it but very soon abandonded their programs. F. If you had a bottle of CNG you would need to up the pressure to get the metal hot enough to cut. G. Wouldn't have a clue to what tip to use probably need to be a large ported tip.

Hope this helps,
John A.

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Ben in KY

05-02-2003 06:42:13




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 Re: Re: cutting torch---propane in reply to John A., 05-01-2003 21:14:40  
John,
Natural gas can be used with the propane tip. You just use an adjustable regulator that will give you up to about 15 lbs or so of pressure off of the natural gas mains. Not sure what you are referring to about the compressor, etc. This would be for stationary use in an industrial/shop application.
Not really recommended for home use as the gas company frowns on having a cutting torch hooked up to their lines :) A special antiblowback device is required.

One other note. You can braze with Oxy/Propane, but not weld.

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Robert in W. Mi

05-05-2003 15:16:01




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 Re: Re: Re: cutting torch---propane in reply to Ben in KY, 05-02-2003 06:42:13  
I have a friend who has a welding shop in Alaska. He uses nat. gas straight out of the pipe in his shop, as much as possible to keep cost down. Seemed to me it worked pretty good. I've long forgotten what diff. set up he used to do it though. Robert



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John A.

05-03-2003 12:44:45




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 Re: Re: Re: cutting torch---propane in reply to Ben in KY, 05-02-2003 06:42:13  
Ben in KY, What I was talking about was getting the natural gas into a useable form, ie like LPG or Act. I didn't know is was for stationary use. Or that it was possible to use it straight out of the pipe. I agree that back flow preventers are absolutly critical for saefty. Though I have never personly seen it done useing natural gas straight out of the pipe. The natural gas lines we ran our irrigations wells off of didn't carry more than 7 to 9 lbs of pressure, where we needed 10 to 14 oz. to run the wells mainly-- HD800 MMs, 605 IH, 440 chryslers ,3306 Cats.
So comming from my experience with low line pressures That is why I was talking about the compression of natural gas to make CNG first. Primary lines probably have sufficient pressure, but the secondary or third stage lines we had never saw pressure such pressures. So I see what you are talking about. If have spoke out of school I appoligize.
I cut with LPG/O2 The tip I have is called "The Scrapper" used by a lot of scrap yards ,so my welding supplier told me. It is big Mama , but does a good job for what I need. Catch ya'll later,
John A.

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Bill 52 8n

05-01-2003 12:44:58




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 Re: cutting torch---propane in reply to wvbill, 04-30-2003 15:36:58  
You can use natural gas. To cut with it you need special tips (maybe a special torch, i forget) that has more preheat holes then a standard torch tip. I've been told large fabrication shops will plumb their shops for it so they aren't constantly changing acetylene tanks. Since the flame is cooler it is generally used to preheat instead of cut, but its still a cost savings none the less.

Bill

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Ben in KY

05-01-2003 05:56:00




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 Re: cutting torch---propane in reply to wvbill, 04-30-2003 15:36:58  
The pressures you run when cutting with Propane are similiar but a bit higher than using acetatline.
I run about 10 propane and 35 oxygen. Of course this will vary a bit depending on your tip size. It does not cut as good as oxy/acy, Close though, it burns cooler so more preheat time is required. Also they are OXY HOGS. You will burn about 4 times the amount of oxygen cutting with propane. The propane will last a long time though.

Do a search here on propane, you will find several threads, Including when I was asking the same questions as you.

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GK

05-01-2003 20:48:23




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 Re: Re: cutting torch---propane in reply to Ben in KY, 05-01-2003 05:56:00  
Try cutting your O2 back to about 18-20 psi and LP to about 7. Cuts good and saves on O2.



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ben in KY

05-02-2003 06:49:27




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 Re: Re: Re: cutting torch---propane in reply to GK, 05-01-2003 20:48:23  
GK,
That is what I do with my smaller torch. I am usually using a big hoss of a torch with a huge tip though. Cuts like heck, but is very hungry. Always refer to your tip info/torch manual for the proper settings.

I like using oxy/propane, I don't like the explosive nature of acetaline. Propane will go boom too, but not as easy as acetaline.



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