Hydrogen as fuel

hi everyone,

years ago i used acetylene and converted to propane. recently i
bought a hydrogen cylinder and regulator to use for casting. i am
well acquainted with the flame characteristics of acetylene and
propane but not hydrogen.

after a little experimentation, i’ve found the cleanliness of
the flame wonderful but have found that the reflection of the
flame off the crucible seems to be much greater than that of
propane or acetylene. i’ve set the hose pressure to 20lbs, the
oxy the same. this is probably excessive but i don’t really know.
my fuel supplier has been marginally helpful. other than a msds
sheet and what i already know, i’ve been on my own until i’ve
posed the question to my fellows here on orchid.

other than the safety and chemical characteristics of hydrogen
available on an msds sheet, what are the flame characteristics?
for example, is it similar to propane in that the flame is a very
consistant temp throughout, or is it like acetylene, with a wide
variance of temp? my observation is that it seems to be less hot
at the tip of the flame than near the tip of the cone. but it is
only a guess. the great reflection of flame off of the crucible
is no guess! it really has some extension. what are typical
regulator settings used for a hydrogen/ oxy set-up? certainly
less oxy is neccessary than other fuels.

i’ve used this set-up for about 3 melts and am really impressed
with the cleanliness of the flame but find it a little awkward
because of my inexperience with this fuel.

what is the word from other hydrogen users? your comments to add
to my experience will be extremely helpful. thanks!

best regards,

geo fox


I read in your note that you are running your oxy reg at 20 lbs?
This very dangerous oxy becomes very unstable above 15 psi.I
would cut back and work from there.



Howdy, You can get a book from Lidsay Publications call “Fuel
From Water” it has all the latested info on hydrogen. Thier ULR
hope this helps jerry

   I read in your note that you are running your oxy reg at 20
lbs? This very dangerous oxy becomes very unstable above 15
psi.I would cut back and work from there.

hi LZ, thankyou for your reply but this is not correct. you must
thinking about acetylene becoming unstable at 15psi. oxy is a
very compressed gas when it comes in the cylinder, 2000psi! when
i cast with propane, i run my oxy hose pressure at 10 to 45 psi ,
depending on what i’m melting. best regards, geo fox

I defer to your opinion, but isn’t it acetylene that becomes
unstable above 15 psi instead of O2? The acetylene regulator that
I have, a Victor has a red line after 15 psi.(a red rest of the
dial actually). I was taught in welding school to run my O2
regulator up to about 20 psi when using a cutting head (or more
if necessary). I also used to cast for a medium sized jewelry
manufacturer using a H2-O2 torch and would frequently use 20 psi
O2 or better.Oh pray tell us true,ye gods of the oxy-acetylene
torch! :^) Regards- Ricky Low

Howdy, “Fuel From Water”, I’'ve been using hydrogen for 12
years now in the jewelry business. I can melt platinum in small
quantities, and anything else, including large gold class rings.
The tips are hypodermic needles of various sizes. The machine
that generates the hydrogen costs about $900.00. The flame is
prefluxed, but I still use a fire coat. Initially, you add an
electrolyte, after that, you just add water. It burns at 5000
degrees, but you have complete control if the volume of gas,
hence the volume of flame. I bought mine from a company called
Casker, in Cincinnatti, OH.

Hope this helps. Duane

This is not true, Oxygen does not become unstable as pressure
increases, but it does become more hazardous as the
concentration increases. This pressure is probably too high for
your torch even 15Hope this only posts once. Jesse