Post by thread:[OT]: oxy-hyd welder

Spehro Pefhany wrote: > > At 10:12 AM 6/26/02 -0500, you wrote: > >For marine use there is Bronze wool. It is corrosion resistant and might be > >better at stopping fire in a high oxygen environment. > (P.S. bronze screen was suggested by someone else- probably the corrosion > resistance and high thermal conductivity). Bronze wool would be ideal, I > can just stuff the torch handle with it. I've just ordered a commercial one > for the gas generator itself. I have played with oxy-hyd too, lots of fun. The scariest problem is if your generator stops producing and the flame runs back up the tube as the pressure decreases, i'm not sure that bronze wool will be a good enough flashback arrestor at all as the mixture has its own oxygen and will continue burning even when meshed. And probably ignite the lube in the bronze wool. Try an inline pressure relief valve (ball and spring type) a couple of feet down the hose. This acts as a one way valve and in the event of pressure loss the ball should close the orifice before the second or two it takes for the flame to travel back to that part of the hose. You are using clear hose? :o) -Roman -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

At 01:46 AM 6/27/02 +1000, you wrote: >I have played with oxy-hyd too, lots of fun. The >scariest problem is if your generator stops producing >and the flame runs back up the tube as the pressure >decreases, i'm not sure that bronze wool will be a good >enough flashback arrestor at all as the mixture has >its own oxygen and will continue burning even when >meshed. And probably ignite the lube in the bronze wool. I've got a commercial arrestor on order to go after the electrolysis cell. (BTW, it will be controlled with a PIC..) .. this will just be for cheap insurance. >Try an inline pressure relief valve (ball and spring >type) a couple of feet down the hose. Any idea where to get one of those cheap? I could always make one. I need something like that to protect the pressure sensor diaphragm from rupturing when the pop happens. A few PSI operating and 15psi to open is about right. >You are using clear hose? :o) Urethane, probably. Best regards, Spehro Pefhany --"it's the network..." "The Journey is the reward" spam_OUTspeffTakeThisOuTinterlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com 9/11 United we Stand -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

Spehro Pefhany wrote: > I've got a commercial arrestor on order to go after the > electrolysis cell. (BTW, it will be controlled with > a PIC..) .. this will just be for cheap insurance. > > >Try an inline pressure relief valve (ball and spring > >type) a couple of feet down the hose. > > Any idea where to get one of those cheap? Any auto supplier, they use them in just about all FI cars as "one way air valves", about 5/16 ID hose push on fittings but you can add hose clamps externally. > I need something like that to protect the > pressure sensor diaphragm from rupturing when the pop > happens. A few PSI operating and 15psi to open is about > right. Ooops. When the "pop" happens it will blow the absolute crap out of your container and fittings. What volume of gas will you have in the container where it can pop? Don't underestimate the explosive power of even a small quantity of gas, a fist sized volume will blow the sides out of a heavy gauge steel welded container. I'd love to see your design. Before you blow it up. :o) -Roman -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads