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Acetylene torch problem

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Jeff

03-16-2001 09:32:27




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I am new to this forum so be patient. I have a new small tank o/a out fit. I was playing with it last night and I was getting poping at the back of the rose bud head. the pressure for acetylene was 5-7 and oxy was at 30. Any ideas?

Jeff




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Jeff

03-19-2001 04:20:22




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 Re: acetylene torch problem in reply to Jeff, 03-16-2001 09:32:27  
Thanks for the advice, the tip nut was loose. That solved the poping problem. I have a new question, I was using the cutter head and I got a good flame but when I hit the trigger I didn't get any blowing. Any ideas?



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T_Bone

03-19-2001 07:09:24




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 Re: Re: acetylene torch problem in reply to Jeff, 03-19-2001 04:20:22  
Hi Jeff, you have to turn on the oxygen valve on the mixing chamber (one next to the hose) and then use the oxygen valve on the cutting head to regulate flame oxygen to the tip.

A book from the mfg. would be a good buy on how the torch orperates. This might save you from hurting yourself latter on.

T_Bone



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Robert (AL)

03-19-2001 10:58:05




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 Re: Re: Re: acetylene torch problem in reply to T_Bone, 03-19-2001 07:09:24  
I read in a welding book, that you should turn your regulators back to zero, before you turn on the supply of gases from the tanks, and then regulate the amount of pressure you need. According to the author, this will protect your regulators. Is this a good practice to follow?

Robert



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T_Bone

03-19-2001 21:20:53




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 Re: Re: Re: Re: acetylene torch problem in reply to Robert (AL), 03-19-2001 10:58:05  
Hi Robert, Yes it's a great habit to form as it applies less stress to the diaphrams, not the shock that they receive when there left on as main pressure is applied. I really doubt if you find to many operators doing this tho because if you open the main valve real slow it's about the same as backing off the secondary pressure. Bad habbits are hard to break including mine!

T_Bone



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VaTom

03-19-2001 17:32:55




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 Re: Re: Re: Re: acetylene torch problem in reply to Robert (AL), 03-19-2001 10:58:05  
My understanding was to always turn the regulators back when you are finished using them. Then adjust the pressure when you turn on the tanks. But I'm only a few years into my regulators.



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Alan K

03-17-2001 16:53:38




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 Re: acetylene torch problem in reply to Jeff, 03-16-2001 09:32:27  
Hi Jeff - like you, I lack gas torch welding experience. You already have good answers to your questions however I would like to add one more safety consideration. Before you lite up your torch you can check out for gas leaks. Many people recommend and use a mix of soap and water however apparently its not the best mix as all soaps have oil. I got a small bottle of leak detector from a local propane dealer called "Sherlock 5-second Leak detector". Good luck with your torch. Alan K.

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T_Bone

03-16-2001 21:11:02




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 Re: acetylene torch problem in reply to Jeff, 03-16-2001 09:32:27  
Hi Jeff, You have a leak at the tip head or at the burner tube nut where it connects to the mixing chamber. Depending on brand, theres a O-ring(s) at the mixing chamber connection that could be bad. Also make sure inside your tip tube is clean and without dust. Dust is a problem to gas flow as it causes gas turblence within the tube. Make sure if you use compressed air to blow the tube out that the air is oil free or preheat the tube to burn out the oil with another heat source. I would use my oxygen hose to blow the tube out and you have to take the tip off. Clean the tip orfices while your at it. Your gas pressure settings are fine.

T_Bone

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clickent

03-16-2001 18:35:13




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 Re: acetylene torch problem in reply to Jeff, 03-16-2001 09:32:27  
Here is a link to a chart for the correct pressures. >Link

Without>Link knowing your make or tip size I will tell you that your oxy pressure is too high.

Also, rosebuds are bad for pre-ignition because they get so hot and the gas ignites before it gets out of the torch. To combat this I use the max recommended pressure and try to heat in a way to keep the tip as cool as possible, such as never heat into a corner and keep the torch moving. Be sure to heed the warning the previous poster gave. I believe the rule is 1/7th not 1/10th.

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GPWT

03-16-2001 14:23:23




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 Re: acetylene torch problem in reply to Jeff, 03-16-2001 09:32:27  
Stop! You must make sure that your acetylene withdrawal rate is less than 1/10 of the cylinder capacity per hour. Rosebuds use gas at a high rate. If you have an 80 CF cylinder, use no more than 8 CF per hour-these numbers are for example only. If you withdraw acetylene at a rate higher than this you could cause some of the acetone in the tank to also be drawn out, and the tank could become unstable. You wouldn't like the results, if you lived through it. The acetone's function is to stabilize the acetylene. This is why you also never use an acetylene tank on it's side. If you lay it down, stand it up for several hours before use. Also, never pressurize acetylene greater than 15 PSIG unless it is in a specially made cylinder.

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