The more I think about it, the more I disbelieve the whole cutting torch story. Apparently at least one of the rumors of the cutting torch purchase came from a poster on the ksl.com comments Site. As we all know, posters often tell tall tales -- and love the attention some sensational juicy bit of news can garner them. :waitasec:
http://www.ksl.com/index.php?nid=148&sid=9522814&comments=true
Portable torch:
http://www.harborfreight.com/cpi/ct...cpc&zmam=33951326&zmas=12&zmac=112&zmap=65818
Normal size torch:
http://www.globalindustrial.com/p/m...ylene-Kits-google_pr&infoParam.campaignId=T9F
What's the Difference: Torches
Discover the difference between propane vs. propylene gas torches for homebuilders, remodelers and plumbers
by Rob Yagid
There are three primary fuel options for torches used to solder or braze metal: propane, propylene, and acetylene.
Acetylene is expensive, burns extremely hot, and is available only in large, refillable tanks. It’s best suited for professional plumbers and those who solder and braze thousands of joints a year.
For homebuilders and remodelers who are in only occasional need of a torch, propane- or propylene-fueled units might be a better option.
Propane: With a flame temperature in air of roughly 3450°F, propane burns cooler than propylene. This can be a weakness or a strength, depending on the experience of the person using the torch.
Pros
• Inexpensive
• Less likely to overheat a joint or ignite surrounding materials
• Suitable for soldering pipe 1/8 in. to 1 in. in dia., making it an economical option for basic plumbing jobs
• Considered a forgiving torch for less skilled tradesmen and apprentices
Cons
• Takes longer to get metal hot enough to melt solder
• Does not burn hot enough to braze, which creates much stronger connections
• Can’t be used to solder large pipe and fittings
• Might not be possible to solder pipe that still contains some water, which steals heat
Cost
$3 per 16.92-oz. cylinder
Propylene
Manufacturers that once supplied MAPP gas, which has been discontinued, are now pushing propylene fuel. It has many of the same attributes as MAPP gas, including a higher price tag. However, that cost buys you greater performance.
Pros
• Has a flame temperature in air of roughly 3600°F, so it can be used to braze metal
• Burns hot enough to overcome the thermal effects of small amounts of water in plumbing lines, making it great for remodeling tasks
• Heats pipe and fittings 20% to 24% faster than propane, decreasing overall labor time
• Suitable for soldering or brazing pipe 1/8 in. to 3 in. in dia.
Cons
• Expensive
• Less forgiving than propane in terms of safety and technique
Cost
$9 per 16.92-oz. cylinder
Photo: Rodney Diaz
From Fine Homebuilding 208, pp. 80
November 12, 2009
ACETYLENE:
Acetylene is the primary fuel for oxy-fuel welding and is the fuel of choice for repair work and general cutting and welding. Acetylene gas is shipped in special cylinders designed to keep the gas dissolved. The cylinders are packed with porous materials (e.g. kapok fibre, diatomaceous earth, or (formerly) asbestos), then filled to around 50% capacity with acetone, as acetylene is acetone soluble. This method is necessary because above 207 kPa (30 lbf/in²) (absolute pressure) acetylene is unstable and may explode.
There is about 1700 kPa (250 lbf/in²) pressure in the tank when full. Acetylene when combined with oxygen burns at a temperature of 3200 °C to 3500 °C (5800 °F to 6300 °F), highest among commonly used gaseous fuels. As a fuel acetylene's primary disadvantage, in comparison to other fuels, is high cost.
As acetylene is unstable at a pressure roughly equivalent to 33 feet/10 meters underwater, water submerged cutting and welding is reserved for hydrogen rather than acetylene
http://en.wikipedia.org/wiki/Oxy-fuel_welding_and_cutting
http://www.finehomebuilding.com/too...ference/torches-propane-vs-propylene-gas.aspx