This is a First--acetylene torch--LEAKS!! - Page 2 - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
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post #16 of 27 Old 05-13-2019, 03:10 PM
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Re: Acetylene Tank Valve Leak [photo]--burnt hand

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Originally Posted by Durfman View Post
Tudor you surprise me at times--I agree but when you watch these shows on TV when there using torches they open them ALL the way?? [Wrong] I was taught in school to open little like you said but they must have forgot that part now-a-days???
Yeah. I learned the same at both an industrial cutting/welding course and a government gasfitter certification course when working as a tradesman in heavy industry.

In the TV shows, are they using bottles or a manifold system? That will make a difference. The gas supply valve for a manifold system is a 1/4 turn open or close valve, the same as for a residence using natural gas. The user ports on the manifold are opened all the way to ensure sufficient gas flow for the appliance.

Keep in mind that while the supply valve for a manifold system may be wide open at 1/4 turn, it is supporting several appliances, each with their own demands for gas flow. The objective of using a 1/4 turn valve is still speed in shutting off the gas flow in an emergency when time may be critical.

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post #17 of 27 Old 05-13-2019, 04:53 PM Thread Starter
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Re: Acetylene Tank Valve Leak [photo]--burnt hand

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Yeah. I learned the same at both an industrial cutting/welding course and a government gasfitter certification course when working as a tradesman in heavy industry.

In the TV shows, are they using bottles or a manifold system? That will make a difference. The gas supply valve for a manifold system is a 1/4 turn open or close valve, the same as for a residence using natural gas. The user ports on the manifold are opened all the way to ensure sufficient gas flow for the appliance.

Keep in mind that while the supply valve for a manifold system may be wide open at 1/4 turn, it is supporting several appliances, each with their own demands for gas flow. The objective of using a 1/4 turn valve is still speed in shutting off the gas flow in an emergency when time may be critical.
Yep--I agree 100%-- I took that tank back today and talked with guy in charge he started giving me some say static about situation so I caught on and told him my hand will heal up all I want is credit for the gas in that tank and a new one so I can get on with what I,m doing. He change his whole tone after that--Think he thought I was going to sue him or something??

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post #18 of 27 Old 05-13-2019, 08:34 PM
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Re: Acetylene Tank Valve Leak [photo]--burnt hand

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Incorrect!

Oxygen bottle valves need to be fully open to prevent the pressure from getting behind the valve disc and jamming it so that it can't be closed.

Fuel gas valves are to be opened no more than 1/4 turn so that in an emergency, the fuel gas can be cut off with a flick of the wrist.

The difference is in the relative pressures, 2200 psi for oxygen and 225-250 psi for fuel gasses.

Don't think that that is open enough? I run a 40K BTU heating torch with the propane valve usually open less than 1/8 turn, the same as for the 60K BTU barbeque. Cutting torches use a lot less fuel gas than heating torches or appliances.

Acetylene, natural gas, and propane all come under the general heading of fuel gases.
You are 100 percent right. I use them everyday and never more than crack the acetylene, don't lay on side or drop them. Brain is slow at times. We use so many different compressed gases different rules apply to all. Some have to be layed down to work, upside down or used upright

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post #19 of 27 Old 05-15-2019, 12:57 PM
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Re: This is a First--acetylene torch--LEAKS!!

I was just going to chime in on the valve being fully open being incorrect. The oxygen tank is a double seat valve where the fuel tank isn't. In my 50+ years of using a torch almost daily I have never heard or witnessed a leaking tank like described. The OP for your burn try Foley ointment. It is the best I have found for a burn like that. You were lucky this round. There is a reason it is recommended to use soapy water when first installing and pressurizing a torch set up.
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post #20 of 27 Old 05-15-2019, 03:00 PM
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Re: This is a First--acetylene torch--LEAKS!!

i have heard of an acetylene tank blowing up on a ship and going out the side and sinking that ship and several others in the harbor skipping across the water like a torpedo that's why it sticks so you could smell it.
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post #21 of 27 Old 05-15-2019, 05:32 PM
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Re: This is a First--acetylene torch--LEAKS!!

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i have heard of an acetylene tank blowing up on a ship and going out the side and sinking that ship and several others in the harbor skipping across the water like a torpedo that's why it sticks so you could smell it.
May not have been acetylene. Some kids I knew when I was a sprout got ahold of some large oxygen cylinders and broke the valves off with a sledgehammer and launched them. They will go like a rocket. Always leave caps in place, chained to wall and use no oil on threads. Our distributor 10 bucks extra if you put oil on threads

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post #22 of 27 Old 05-16-2019, 11:16 AM
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Re: This is a First--acetylene torch--LEAKS!!

We had a O2 tank go thru a cinder block wall at the metal fab shop in trade school,when it fell over and the valve sheared off!..it stopped halfway thru the wall and was wedged in there so tight the blocks had to be chiseled away to remove it..
The shop teacher said he wished he could have left it there as a reminder how dangerous those tanks can be with over 2000 psi in them..

They used to use the same type of tanks to assist jets taking off ,"JAYTO" rockets..
You guys probably read the story about the guy who supposedly strapped a few in the trunk of a '67 Chevy Impala and got it airborne in the desert and hit the side of a mountain..I believe MythBusters did a show on that trying to reproduce the stunt..

A scrapyard a few towns away had a full [email protected] tank somehow end up in their steel pile,and the guy clearing the pile with an excavator that had huge snips picked it up,and cut it,and it flew over half a mile,and landed in a house's bathroom!--it came right thru the roof,and landed in the bath tub!..the homeowner had just taken a bath less than a half hour before that too!..said he thought his house was hit by an airplane!..


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post #23 of 27 Old 05-16-2019, 05:37 PM
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Re: This is a First--acetylene torch--LEAKS!!

I brought up the point of opening the valve on tanks only 1/4 turn in a meeting at work today. Someone with more experience than I with tanks said that shouldnít be done because the pressure relief valve wonít work unless the valve is either all the way open or all the way closed. Didnít sound right to me. Donít they work all the time?
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post #24 of 27 Old 05-17-2019, 05:34 AM
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Re: This is a First--acetylene torch--LEAKS!!

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I brought up the point of opening the valve on tanks only 1/4 turn in a meeting at work today. Someone with more experience than I with tanks said that shouldnít be done because the pressure relief valve wonít work unless the valve is either all the way open or all the way closed. Didnít sound right to me. Donít they work all the time?
You are correct. The relief valve senses internal pressure at all times.

The pressure relief valve operates independently from the shut-off valve. If the tank is in a fire, the relief will still pop when the pressure builds high enough whether the valve is fully opened, fully closed, or anywhere in between. Its sole purpose is to vent the internal pressure should it rise too high.

In the case of a propane valve, the relief valve is in the same housing as the shut-off valve, but it is not part of the shut-off valve circuitry. They are both supplied from the same point, but the flow exits from different ports.

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Last edited by TUDOR; 05-17-2019 at 05:40 AM.
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post #25 of 27 Old 05-17-2019, 08:17 AM
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Re: This is a First--acetylene torch--LEAKS!!

Take the bottle back to the supplier or exchange place and get another one. It has a defective valve.

I've seen few bottles that would leak even when turned off. Seen couple of exchanges for full and they were empty or low when went to place them in service. Simply took them back for free exchange and no problem.

Appears you were lucky that it did not torch you.
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post #26 of 27 Old 05-17-2019, 08:41 AM Thread Starter
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Re: This is a First--acetylene torch--LEAKS!!

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Originally Posted by Forest Gump View Post
Take the bottle back to the supplier or exchange place and get another one. It has a defective valve.

I've seen few bottles that would leak even when turned off. Seen couple of exchanges for full and they were empty or low when went to place them in service. Simply took them back for free exchange and no problem.

Appears you were lucky that it did not torch you.
I took it back and they started to give me some static and I had to BUY another tank --they said they would weight it then give me credit for gas inside? It still has 3/4 left---And the tank I got now is 3 inch smaller in height and they charged me $10.00 more and say it has MORE gas in it?? [same diameter] I been arguing with them but no use? I had this torch & cart set up over 35 years ans this is first time I had to put a 4x4 under tank so gauges would set above the try on cart.

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post #27 of 27 Old 05-17-2019, 02:33 PM
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Re: This is a First--acetylene torch--LEAKS!!

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I took it back and they started to give me some static and I had to BUY another tank --they said they would weight it then give me credit for gas inside? It still has 3/4 left---And the tank I got now is 3 inch smaller in height and they charged me $10.00 more and say it has MORE gas in it?? [same diameter] I been arguing with them but no use? I had this torch & cart set up over 35 years ans this is first time I had to put a 4x4 under tank so gauges would set above the try on cart.
Wondering who the name of the gas supplier is? (not the exchange station) like for example Jimmy Jones, Airgas or ?
I file away my exchange receipts.

Just my 2 cents worth.

The gas supplier does not seem to realize right now, at the moment that you could have very easily been talking to a Lawyer instead of them. It would have cost them more than $10 for THEIR defective valve damages.

Them exchange people you were dealing with sure has poor customer relations dept.

Anyway I think you are very lucky you did not get seriously burned or worse.

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