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The IFGC says you need a test pressure of 1 1/2 times the maximum working pressure. Need to get a value. I assume 30 lbs. for oxygen and 15 lbs. for acetylene. I figure to be safe at least 80 psig to test but would like to know what you "aces" think would be the maximum working pressure would ever be used? Thank you very much.
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I have not had an oxy rig on my truck since the truck with that rig was stolen, but for me, it always depended on the tip being used. You can put a lot more pressure into a large rosebud, for example.
On my turbo torch, I turn up the pressure for my A32 "tailpipe" tip.
The Harris or Victor sites should be a good resource for this info.
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Every acetylene gauges I’ve seen red lines at 15psi so I guess 15 and 30. I use a cutting tip and don’t hit the air when space allows.
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Every acetylene gauges Ive seen red lines at 15psi so I guess 15 and 30. I use a cutting tip and dont hit the air when space allows.
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20 & 10 come to mind with the FDNY test but that was 40 years ago!
Now Im confused with the Test Pressure. The 3 copper is a Oxygen line?
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Not 100% sure I understand the issue...
For brazing copper lines... we use an Oxy/Acety torch... mini bottles... usually I run a #2 tip, with 2.5-3# Acy and 9-10# O2 pressure... sometimes I will adjust the Acy up to 4# and the )2 up to 11-12#... if I am brazing 1-1/8" pipe (rarely do).
Brazing is as much an art form as a science... one needs to practice until the variable (gas pressure, pressure ratio, tip size, flame type and size, etc) are all in balance... AND, one understands the relevance of why each one would be changed to obtain a specific purpose!
Oh, and then there are different tip sizes and types...
Definitely more going on here... than an A or B thing...
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Strictly small oxy/acet. Torch sets:
7 and 7. The only reason to crank up your regulators past 7 psi is for using the oxy cutting tip.
You can braze 3 copper with a small oxy/acet. Rig, but you have to push the heat around...takes some practice. At that point, youre prolly better off with a B tank.
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acetylene becomes unstable over a certain pressure, 15# or 30#, i forget, either way thats why max limits are set at 15psi. this way if you leave the acetylene hose full over the max pressure it wont act like nitrogycern(?) and explode if the hoses are smacked hard
or so ive heard. thats the point of the disolved acetone in the tank, so it can be stable at higher pressures, but once out of the tank you have to keep the pressure low
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if youre asking on what to run your regulators at. It depends on the tip you are using. The size of the tip determines the pressure needed. its not a one and done setting.
Guys have hit on the maximum pressures already.
Check out the manufactures info of the tips you're using and see what they say the settings are.
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acetylene above 15# psi will try to come out as a liquid, EXPLOSIVE.
my normal set up: oxy 10-15# unless cutting tip in use, acty: no more than 7#.
If you are ever really bored, inflate a balloon with acetylene and ignite, the further you are from it the better at ignition. Ear plugs are mandatory.
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Would a double tip be better on that size pipe? Is a nitrogen purge needed to keep the inside of the pipe clean for oxy use?
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I could be wrong but I don’t think the op is doing med gasOriginally Posted by TechmanTerry
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I told my wife when i die to sell my fishing stuff for what its worth not what i told her i paid for it
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If you find the catalog online for the brand of torch set up you have, theyll typically list recommended pressure settings.
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I'm confused. Are you asking what oxy/acet pressures to use for brazing?
If so, the pressures remain the same regardless of the size of material. It's all about tip size. You use the same pressures on your regulators for a tiny tip as you do for a giant rosebud. It's just that you'll get a LOT more flow with a giant rosebud. You may even need to manifold tanks together (parallel) to get enough flow, especially with the acetylene.
I do a triple evac with nitro to remove non condensables.
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By standard definition the test pressures would be 22.5 and 45 lbs. <g>
Is this for a hard piped O&A system for a facility? For a glass lab / glass manufacturing place or an iron fabrication shop or something?
What does the spec call for?
I think I would want to see the piping pass test at 150 lbs. or so.
PHM
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PHM
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When faced with the choice between changing one's mind, and proving that there is no need to do so, most tend to get busy on the proof.
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This website lists no pressure higher than 45 lbs. - so a 150 lb. test pressure would still be OK.
What is the application?
What piping are you testing?
Does the job have a spec. sheet?
Or are you doing this for yourself or otherwise casually?
PHM
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PHM
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When faced with the choice between changing one's mind, and proving that there is no need to do so, most tend to get busy on the proof.
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Get a big rosebud with the head 3 /4 -7/8" and handle for it. You will use it even on smaller copper in the wind.
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What the hell are we talking about here?
Glen's post asked about test pressures for oxygen and acetylene piping of some kind. Didn't it? <g>
There was nothing about using a torch or anything like that . . . was there?
PHM
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PHM
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When faced with the choice between changing one's mind, and proving that there is no need to do so, most tend to get busy on the proof.
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It's in the title of the thread.
I do a triple evac with nitro to remove non condensables.
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