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Acetylene Tank Pressure


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  #1  
Old 04-10-2010, 08:58:40 AM
Holland501 Holland501 is offline
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Default Acetylene Tank Pressure

It's Sat. so all the shops are closed. My question is: What is the pressure(PSI) of a full tank of acetylene? Thanks for reading.
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Old 04-10-2010, 09:25:07 AM
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Default Re: Acetylene Tank Pressure

I swear mine is always at 250 when I get a new one, but I also read that no matter the size of the cylinder, the full pressure is 225.
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Old 04-10-2010, 10:22:27 AM
PTSideshow PTSideshow is offline
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Default Re: Acetylene Tank Pressure

Acetylene:
225psig is what the Compressed Gas Association states. It could be your gauge is slightly off, or the gauge at were they fill it is slightly off or some combination of the two. It also could be that the temperature of the cylinder will cause the pressure to vary, The norm for filling is 70'F(21'C) higher it will increase,lower it will decrease.

Oxygen:
2250 psig is a full cylinder at 70'F (21'C) same applies.

As some additional info:
explosive limits in air% 2.5 to 80% in any concentration
oxygen 3.0 to 93%
It is shock sensitive and unstable over 15 psig

Reaction with common materials It reacts badly with copper that is 67% or above pure and silver alloys and mercury.

The solid/hollow material in the cylinders is called Agamassan (AGA) It is not filled to the very bottom of the valve there is a couple of inches of space needed to have the dissolving action take place.

In addition to acetone DMF (Dimethyl Formamide) is used to dissolve the acetylene gas for storage and transport.


The photo is from the internet

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Old 04-10-2010, 10:28:07 AM
LeRoy IHC LeRoy IHC is offline
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Default Re: Acetylene Tank Pressure

I don't know if it's fact, but I've always been told that you should allow the tank to stand up right for a day after transporting it if you lay it down? Does anyone know if this is fact or an old wife's tale?

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LeRoy
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Old 04-10-2010, 10:31:22 AM
PTSideshow PTSideshow is offline
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Default Re: Acetylene Tank Pressure

One other thing the suggested lowest pressure to avoid carryover of the liquid solvent droplets with the gas is 50psig. Others say 25psig. I am not going to respond to any one that whats to argue about it. There are people that say right down to the last drop.

All torches and regulators react and act differently to the carry over of the solvent. It will attack the material that is used for o rings and seals,it will cause the torch to operate sporadically, the flame will tend towards spurting and funny colors. It will also drip burning liquid solvent on the work.

Not to mention that it will contaminate the weld puddle,and base metals when welding.

Everybody has to do what they have to do!
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Old 04-10-2010, 10:57:11 AM
PTSideshow PTSideshow is offline
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Default Re: Acetylene Tank Pressure

They suggested minimum time is 15 minutes for every 15 minutes on its side in transport. Some say 30 minutes, again 15 minutes is the CGA industry suggested standard.

Of course this is to let solvent filled gas, work it way back into the fill. So do don't get carry over of the solvent into the regulator or torch.

Any additional time will not cause any loss other than time.

Some locations (states have slightly differing laws on the transport of compressed gas, some require that they be transported in the up right position at all times. Or they can't be transported in an enclosed vehicle at any times.

Also Fed DOT states that anyone transporting any compressed gas cylinders must have MSDS (Material Data Safety Sheets) on them. Most if not all LWS have a sign stating as much on the wall or counter. Ask for one for each type of gas you carry and keep em in the glove box! Cheaper than a ticket, as some locals sit near the LWS and stop people to raise revenue.

One other common old wife's tail, is about the asbestos/cement mix in the cylinders. Yes there was a period of from 3 to 5 years that it was tried before it discovered that the other stuff was better.

It is very doubt full that you will find any acetylene cylinders that have any in them still in use.They were removed and destroyed years ago.

The cylinders used in the compressed gas biz are tracked by the CGA from manufacture to disposal.
Around the ring there are the serial number,manufactures symbol month year along with others.

The cylinders and the contents other than the gas are considered hazardous waste. The approved disposal method is either cutting a large hole in the cylinder wall 8' to 10" dia. Or cutting the cylinder in half as in the photo in my previous post.

The solvent will be brown to black in color generally and thicker like syrup, due to the contaminates in the cylinders. It also goes with out saying that the AGA inside it is a mess if you try to remove it, it gets everywhere.
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Old 04-10-2010, 01:09:24 PM
lornes lornes is offline
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Default Re: Acetylene Tank Pressure

Also a short safety note. At work we were taught never to exceed 15 psi acetylene on the regulator due to explosion. Most acetylene regulators are shaded in red after 15 psi. Also turn on the oxygen first so if the oxygen regulator fails the oxygen won't hammer the acetylene and cause an explosion. Always turn on your tanks facing the sdes or the rear of the regulators to avoid a face full of regulator parts if an explosion should occur.
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Old 04-10-2010, 04:06:15 PM
Holland501 Holland501 is offline
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Thumbs up Re: Acetylene Tank Pressure

Many thanks to all. I was pretty sure it was 225-250psi. but someone wanted to argue that it was 375psi. Their reasoning was that the gauge went to 400psi. Thanks for settling things.
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Old 04-10-2010, 04:59:42 PM
PTSideshow PTSideshow is offline
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Default Re: Acetylene Tank Pressure

To finish it off one more item regards to safety, the acetylene cylinder has from one to four fusible plugs/safety plugs that melt at 212'F(100'C) to release the cylinder contents to the atmosphere, when heated to melting. To prevent rupture or explosion. They will be on the top, or top and bottom depending on the size of the cylinder.
When the bottom ones develop a pin hole leak, due to the shape of the bottom. The concave shape fills with gas as a spark rolls across the floor under the cylinder it will ignite the gas and send the cylinder up about 2 feet or so, and then a big clunk when it falls. Had one do that, couldn't figure out what was going on till somebody caught the show. One reason why they say to chain em higher up the cylinder or use two chains.

The oxygen cylinder has a rupture disk in the back side of the valve, rupture occurs above 3360psig which is the cylinders test pressure.

Because the oxygen cylinder is at a higher pressure the valve has to seats to prevent leakage when the valve is open. it only seats fully when the valve is opened all the way.

Acetylene uses a low pressure, and only has one seat in the valve. Also you only need to open it a 1/4 to 1/2 turn. To get the full pressure. It also makes it easier to close it tight in case of a fire.
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Old 04-11-2010, 07:46:51 PM
PTSideshow PTSideshow is offline
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Default Re: Acetylene Tank Pressure

Here is something else you may find of interest, I am posting the link to another thread
Copper Acetylide an explanation of DANGER
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Old 04-11-2010, 09:04:51 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Acetylene Tank Pressure

originally 'Prestolite was a reademark for the tanks supplying gsa to auto headlights! Yoy can still find tanks with the word prestolite sitll welded into the cylinder. The small tanks (MC) were made for motor cycles! If you have an acetylene cylinder that has been laid down, and then put right into service, you will get liquid solvent into the regulater. This will damage the regulater. The upright stand time is equal to the time the cylinder was down (if known) or 24 hours. Never exceed 15 PSIG in the low side of the regulater. Any higher pressure, and you risk self ignition or explosion. Last year a gas supply center had a major explosion that killed several workers and destroyed the building, due to improper Acetylene refill operations.
Andrew
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