Hello All,
I have spent years using and advocating hydrogen for most golds and
platinum. well now we are working with 950 palladium. So we got a
propane torch with tank and regulator. What pressures are best for
casting platinum and gold?
Thanks
Daniel Ballard
Hi Daniel,
I’ve been casting platinum 95/5 for several years with a regular
centrifugal casting machine and melting
with oxygen and propane. I use a rosebud tip and I set the propane
about 4-6 lbs and oxygen at 60 lbs. Works fine.
I’m so tickled to be of help to you after all tech support you’ve
given me over this last year. (bg)
Miche
with oxygen and propane. I use a rosebud tip and I set the propane about 4-6 lbs and oxygen at 60 lbs. Works fine.
With large rosebud or heating tips it is important to get the proper
pressure ranges from the manufacturer and use those ranges when
operating it to prevent backfire and or flashback conditions caused
by low gas flow in the torch tip. It is not unusual to use 60 psi or
even greater on large tips but the oxygen to propane ratio for these
tips is usually on the order of 3-1 to 5-1 not 10-1 like you are
suggesting. You may want to check with your tip manufacturer to be
sure of the proper pressures.
Running torch fuel and oxygen lines at different pressures can be
very dangerous. It makes it possible with a torch malfunction to
push one gas back up the other gas line due to the pressure
difference. If you are going to do this you must use check valves in
the lines at the torch handle to prevent this back flow from
occurring as it can cause an explosion or fire in the line if it
happens.
It is also important to make sure that the heating tip you are using
is designed for the gas you are burning, acetylene tips are of a
different design from the propane tips.
For single hole torch tips the standard practice is to have oxygen
and fuel gas at the same pressure.
Jim Binnion
James Binnion Metal Arts
Phone (360) 756-6550
Toll Free (877) 408 7287
Fax (360) 756-2160
@James_Binnion
Member of the Better Business Bureau