[TheForge] Re: RE: Petrogen Torch Yak

Michael H. Murphy blacksmith at comcast.net
Thu Aug 19 19:51:51 EDT 2004 

The Petrogen folks say theirs will not weld, but Opetro, out of China, says
theirs will.  I've not tried either, but I tend to be a bit dubious about
some of this Chinese equipment.

Murf

> -----Original Message-----
> From: theforge-bounces at mailman.qth.net [mailto:theforge-
> bounces at mailman.qth.net] On Behalf Of Rafter Lazy C
> Sent: Thursday, August 19, 2004 6:52 AM
> To: Sponsored by ABANA
> Subject: Re: [TheForge] Re: RE: Petrogen Torch Yak
> 
> Hello guys -
> 
>     I was wondering whether these gasoline torches would be able to gas
> weld
> the same as an oxy-acetylene?  Does anyone have knowledge of this?  I have
> been thinking about replacing my old torch and the gasoline doesn't sound
> bad, but I need to be able to weld with my torch also.
> 
> Rick Crawford at Rafter Lazy C
> Home of Smoky Forge and Lem the Wonder Mule
> 
> ----- Original Message -----
> From: <debmiller at fuse.net>
> To: "Sponsored by ABANA" <theforge at mailman.qth.net>
> Sent: Tuesday, August 17, 2004 6:47 AM
> Subject: [TheForge] Re: RE: Petrogen Torch Yak
> 
> 
> > My understanding of the petrogen torch is that it was developed for the
> Department of Energy for use in the dismantling of nuclear weapons sites,
> like Fernald, etc. I have not personally used one but had previously
> reviewed their performance for possible purchase by GE for use in large
> scale demolition projects. We were taking down 50 plus year old building
> with thick steel plate shielding, 3 foot thick concrete walls that were
> almost solid rebar, etc.
> >
> > The cutting speeds are incredible, fuel costs are(were) cheap and the
> cutting capacity is unbelievable. I will see if I can dig up the DOE site
> that had a pdf file of an extensive study performed comparing the petrogen
> to acetylene.
> >
> > As far as safety, gasoline is not flammable, only the vapors. So the
> unit
> keeps the fuel in liquid form all the way up to the mixing chamber in the
> torch head. Then it is vaporized and mixed with O2 and baby does it burn.
> Gasoline is 125,000 BTU/gallon!!!!
> >
> > That's a ton of heat!!
> >
> > Ray Miller
> > Cincinnati
> > >
> > > From: "Michael H. Murphy" <blacksmith at comcast.net>
> > > Date: 2004/08/16 Mon PM 06:00:05 EDT
> > > To: "'Sponsored by ABANA'" <theforge at mailman.qth.net>
> > > Subject: RE: [TheForge] allstate oxy-propane torch
> > >
> > > After reading through this whole thread (and getting some good info
> out
> of
> > > it), I figured this one would really get everyone going.  N.B. I've
> never
> > > tried it, nor talked to anyone who has, so I'm not claiming anything.
> > >
> > > http://www.petrogen.com/
> > >
> > > Murf
> > >
> > > > -----Original Message-----
> > > > From: theforge-bounces at mailman.qth.net [mailto:theforge-
> > > > bounces at mailman.qth.net] On Behalf Of Bruce Freeman
> > > > Sent: Monday, August 16, 2004 3:35 PM
> > > > To: theforge at mailman.qth.net
> > > > Subject: Re: [TheForge] allstate oxy-propane torch
> > > >
> > > > I went to the site and found the table.  I did not find any
> explanation
> > > > of what they MEAN by oxygen to fuel gas ratio.  As I and others have
> > > > pointed out, it certainly is not the stoichiometry of the respective
> > > > reactions.  It may be "correct", but we have to know what it means
> to
> > > > judge that.
> > > >
> > > > Bruce
> > > > NJ
> > > >
> > > > >>> "terry l. ridder" <terrylr at blauedonau.com> 8/16/2004 3:16:48 AM
> > > > >>>
> > > > hello;
> > > >
> > > > no the table is correct:
> > > > reference for the table are:
> > > >
> > > > twi world centre for materials joining technology
> > > > oxyfuel cutting - process and fuel gases
> > > > http://www.twi.co.uk/j32k/protected/band_3/jk49.html
> > > >
> > > > the usa affiliate is edison welding institute at www.ewi.org
> > > >
> > > > college chemistry book
> > > >
> > > > every one   carbon  atom needs 2 oxygen atoms to form CO2.
> > > > every two hydrogen atoms  need 1 oxygen  atom to form H2O.
> > > >
> > > > propane == C3H8
> > > > oxygen  == O2
> > > >
> > > > C3H8(g) + (5)O2(g) == (3)CO2(g) + (4)H20(g)
> > > >
> > > > the above equation is balanced.
> > > >
> > > > acetylene == C2H2
> > > > oxygen    == O2
> > > >
> > > > C2H2(g) + (2.5)O2(g) = (2)CO2(g) + H2O(g)
> > > >
> > > > the above equation is balanced.
> > > >
> > > > propylene == C3H6
> > > > oxygen    == O2
> > > >
> > > > C3H6(g) + (4.5)O2(g) = (3)CO2(g) + (3)H2O(g)
> > > >
> > > > the above equation is balanced.
> > > >
> > > > On Sun, 15 Aug 2004, James Binnion wrote:
> > > >
> > > > james> Terry your chart is wrong or has a typo.
> > > > james>
> > > > james> Acetylene:
> > > > james> Theoretical Oxygen Ratio,  by  volume 2.5 : 1
> > > > james> Torch Oxygen Ratio, by Volume 1.1 : 1
> > > > james>
> > > > james> Propane:
> > > > james> Theoretical Oxygen Ratio,  by  volume 5 .0: 1
> > > > james> Torch Oxygen Ratio, by Volume  3.5 : 1
> > > > james>
> > > > james> Source for Torch Oxygen Ratio, by Volume
> > > > james> Oxygen Cutting; Meyer; Green et. al.; Welding Handbook, Vol.
> 2,
> > > > 8th
> > > > james> ed., pg. 454,  American Welding Society
> > > > james>
> > > >
> > > > --
> > > > terry l. ridder ><>
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