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8ob
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It came from my local bottle stockist, I will get some info next time I am in there
( who stole the thumbs up
)Bob
Arc Tourist
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The safest way to use a flexible hose with a propane tank would be to have a pressure regulator on the tank, reducing the propane pressure to a sensible pressure, maybe 1-2 PSI, and using a torch designed to operate at that pressure range. Connecting a hose direct to the cylinder is asking for trouble, not just because of the pressure, but the likelihood of gas condensing as a liquid in the hose, causing problems with flame stability. What sort of MAPP gas torch is it? A MAPP gas torch designed for screwing onto a gas cylinder is designed to work at cylinder pressure, so wouldn't be suitable for the reduced pressure option detailed above.
8ob
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I think the one at the bottom of the page is the same, they run fine on propane and compressed air, not sure if the heat would be the same but everything does get to cherry red without an issue.
Oxy Propane/Propylene Torches & Nozzles
Oxygen + Propane Gas Torches and Nozzles, including Brazing and Cutting Nozzles
Bob
For both propane and MAPP gas, the cylinder pressures will depend on temperature, since they are stored as liquid, whose vapour pressure depends on temperature. For Propane at 20degC, cylinder pressure will be somewhere around the 8Bar mark. For MAPP gas, the pressure will depend on the composition (since it is a mixture), and will probably be about 6Bar at 20degC.its probably meant for some cga600 cans then, but dont really know what pressure are those at or what pressure are the 11kg tanks even
Parm
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That’s interesting to know. I’ve never tried compressed air......I think the one at the bottom of the page is the same, they run fine on propane and compressed air, not sure if the heat would be the same but everything does get to cherry red without an issue.
Oxy Propane/Propylene Torches & Nozzles
Oxygen + Propane Gas Torches and Nozzles, including Brazing and Cutting Nozzleswww.thewelderswarehouse.com
Bob
Kram
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Interesting Ive been using toolstation ones for a few years, they seemed to last reasonably well.
Kayos
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Try comparing them to proper Rothenberger ones, they feel empty even when new.
Just to say though I used them in my day job and did for 20 years, so one running out quickly would be immediately evident to me
some of these cans say that they are 25-30 bar tho? so if the hose can take 20bar too, then i would not need any regulator maybe and the torch itself might have it built in already?
and does it say "1L/min" on there too?
and does it say "1L/min" on there too?
1L/min is probably the maximum gas withdrawal rate from the cylinder. 25-30Bar will be the maximum cylinder working pressure, and will be present when the cylinder is hot, probably 70degC. Is there something special about the torch that cannot be obtained with a torch designed for lower working pressure? A hose, which would need to be capable of withstanding at least 50Bar of flammable gas, is going to be quite stiff in use, and will need to be fitted with proper crimped-on ferrules. A push on hose fitting and jubilee clip isn't going to be suitable. The insurance companies won't pay out if something goes wrong!!!
Kram
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My previous one I wrote down the full and empty weights so this current one is just under half full after quite a bit of use. I think you just had a bad bottle, possible some dishonest customers could return them as theres no seal.
I'll try a Rothenberger next time as Zoro does them at a better price, its a good basket filler for free delivery.
Weights listed are the same, 400g gas, 850g total.
Rothenberger 3.5536 Mapp Gas Cylinder 35536R | at Zoro
Rothenberger - 3.5536 Mapp Gas Cylinder available at Zoro.co.uk - UK's Leading Supplier of DIY Tools and Supplies'
CompoSimmonite
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I use Mapp's gas (no oxygen). Only the other day used it to heat a tool up red hot so it could be bent. Far hotter than propane. I've brazed with it in the distant past.
So it's OK for brazing then? I have a maybe job that I could do with brazing. Does away with the fact I don't have a mill.
