spray paint can question

The propellant in many spray cans *is* propane.

GWE

I thought they had pretty much all gone to compressed air, due to environmental concerns, plus safety. I didn't know that a spray can could work as a flame thrower, until my BIL showed me in the hair spray dept at Treasure City 35 years ago ;)

I wonder if you purchased a butane cigarette lighter refill canister if one of the 8 adaptors they supply with it would work with nothing to make?

Even if it doesn't, it would justify buying one of those neat little butane mini torches that use the same canister.

Propane is better because vapor pressure in the can is constant as long as there is any liquid propane present.

Propane pressure varies with temperature, is 110 PSI at 70F See

No, too small a Henry's Law constant. CO2 is remarkably soluble in water and remarkably temperature-dependent in its solubility. It wouldn't be fizzy otherwise.

AARRggghh! & you can use Moore & Wright micrometers to do up nuts, slip guages make excellent packing for small pieces held in vice jaws, whilst your lathe bed makes an excellent anvil, unless you've marked it too much by angle grinding floor tiles on it.

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On Mon, 26 Sep 2005 16:20:06 -0700, with neither quill nor qualm, Eric R Snow quickly quoth:

The flammability issue has always kept me from trying that ploy. Having made hair-net spray cans into flame throwers, I have a lot of respect for the contents of aerosol cans and haven't wanted to punch a steel item (nail, churchkey) through a steel can for fear of sparks.

On Tue, 27 Sep 2005 11:05:12 GMT, with neither quill nor qualm, Gunner quickly quoth:

HF still makes 'em. I saw one a couple months back and I own one. They work OK for thin stuff but won't work for spraying latex paint. DAMHIKT. $9.95 on sale.

I got sseveral of the butane "grille" cannisters (about the size of larger spray paint cans.) on sale the end of last summer and turned a plastic adaptor to fill my $7 HF mini torch. That's probably going to be a lifetime supply for me. That little torch lives on my bench as a handy and clean heat source for small stuff, including heat shrink tubing (With a deft enough quick pass, that is. )

Interestingly, I saw the same little torch on sale at a fancy kitchen shop for about $35 a little while ago. They were selling it for browning the peaks of that stuff chefs top off creme bruleighs with.(Howeverthehell they're spelled.)

Jeff

the top of a crème brulee is sugar

How about adapting one of those little refrigerant-can hoses to puncture the bottom. They already have a rubber seal and a screw-down needle, so you'd only need to invent a bomb-bottom-gripper. ;-)

Wayne

Use the kind that wraps around the OD, shim it as needed. Punctures the side.

Does that have also something to do with why deep sea divers use a helium oxygen mix instead of nitrogen oxygen (air), because maybe the helium doesn't give them "the bends" as easily as nitrogen?

Jeff

yes.

nitrogen dissolves in blood under pressure. it comes out as bubbles when the pressure lets off, causing the bends.

helium doesn't.

regards, charlie

I tried one of these and it did work well for a while, then the nozzle clogged and resisted every attempt at un-clogging. Naturally the stem is an oddball diameter (probably metric) and an ordinary can nozzle won't fit.

Mike

Helium is inert, nitrogen is narcotic at depth.

Helium is much less viscous; much less effort to respire vs other gases.

Instead of helium, sport divers poison themselves with excess oxygen to reduce the pN2 in the mix, aka "nitrox". Sport divers can't be trusted with helium mixes. This is considered cool and advanced.

The end of the burner is straight, but some disassembly is possible on most torches. I have an old Bernz-O-Matic that accepted replacable threaded orifices. Used that for a while. Many torches have a 5/16" dia brass tube that screws into the valve body, even if they don't use removable orifices. I have a B-O-M like that, and a recent one by Goss that is also made that way. Model GP-9

I made an adaptor that fits the threaded hole in the B-O-M valve that accepts the stems I made to fit the old setup with the replacable orifices.

See

I think that would result in paint all over the place. A trick to this is to have the nozzle stem fit the can snugly and push it in smartly. Then turn on the propane. It only takes a couple of seconds to take as much as it's going to. Pull out smartly, replace nozzle. Shake can vigorously so it won't plug again. Commence or resume spraying!

It's not as bad as it sounds. There was a store, (Boots if I remember it right), in England that sold a home brewing kit that included a thick walled plastic brewing container that held about 5 gallons. Once you added the wort and yeast and let if ferment, it built up it's own CO2 feed pressure and carbonation. After a few weeks, when you started pulling off the beer and it got down to about half the level of the sealed container, the pressure was no longer sufficient to push it out through the tap. There was a one way valve on the top where you could inject CO2 from a tool that held a small gas cartridge. I brewed a lot of beer in one of these things overseas and they worked well. Couldn't tell any difference in the taste after I started using the gas injector when the level dropped.

Sport divers are categorically dumber than ... whom? Jeff, a graduate of MIT, was a sport diver. My son, a grad of U of MN in EE, is a sport diver. I doubt that many professional deep divers have PhD's.