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CUTTING PROPANE TANKS

post #1 of 16
Thread Starter 

I had this all planned but now am a little nervous. I was origionally told that if a propane tank was filled with water, it pushes all the gas out and is safe to cut because the chemical mecaptain(not sure if that is right) is non flamable and there just for smell. I really don't want any woofs or booms. Anybody know the correct answer to this one?

post #2 of 16

I have heard several people say that too but I haven't tried cutting one yet. I've also heard some people say they used liquid soap with the water.

post #3 of 16

If you vent it out to the point where there is no more LIQUID left, then purge all the remaining GAS and AIR out with water, then you'll bee ok to cut. You can drain as much water need to do a small cut just to settle your nerves. Bottom line is there has to be vapor and some oxygen in there to combust so if you displace it with water, then you are good to go. The propane doesn't seep into the steel and come out later. It will become a vapor at atmospheric pressure so venting the tank for a while will work. You could go so far as to dump a shatload of baking soda in it and then pour in some vinegar. This will produce carbon dioxide and water. When the bubbles reach the top, you are purged of any O2 and can begin cutting..

The bubbles may not make it to the top but the CO2 will... Put a mouse in a shoebox just above the vent hole, when he kicks the bucket, you have CO2 all the way to the top..

post #4 of 16

Although I have never tried it, I have heard that running a cars exhaust in the tank while cutting will eliminate the chance of explosion because of the carbon monoxide replacing the oxygen in the tank...  It sound reasonable but like I said, I have never tried it.

 

post #5 of 16

I am not sure..... but I bet this guy could tell you how to do it!

(and yes.... that is the gastank he's welding on!)

 

welding_a_gas_tank_undertruck.jpg

post #6 of 16

When I cut my tank, I filled 1/2 way with water put a bottle of Dawn in and filled the rest of the way full with more water. Drained the tank then cut! Had no problems, and I lived to tell about it!!

post #7 of 16

Dont know if this counts but I cut an old alunimun gass bottle , I opened it and vented it for a week , No water no nouthing It didn't go boom

post #8 of 16

 

Quote:
 

I am not sure..... but I bet this guy could tell you how to do it!

(and yes.... that is the gastank he's welding on!)

 

welding_a_gas_tank_undertruck.jpg

 Take good look at this photo.. Notice that he only has one wheel chock at the back tire. Whenever you prop up a vehicle with 2x4's placed vertically, always chock the rear tire in two directions for safety sake!

post #9 of 16

I, like Raptor mentioned, filled the tank with a full bottle of Dawn dish soap. Drained it and filled it up again with clean water. I let this sit for a few days. I drained just enough water out to make my first cut across the top of the doors. Once I started cutting down the door sides I would cut a few inches and let the water drain out of my cut, cut, let drain, cut, let drain...you probably get the pattern now. I still have all of my fingers and toes...for now at least.

post #10 of 16

Why dish soap? Just fill it once with water and get on with it.

post #11 of 16
Quote:
Originally Posted by Pit 4 Brains View Post

 

 Take good look at this photo.. Notice that he only has one wheel chock at the back tire. Whenever you prop up a vehicle with 2x4's placed vertically, always chock the rear tire in two directions for safety sake!


No No he has a second one right there His Ankle. If the truck starts to move just shove your right ankle under the tire. haha

post #12 of 16
Quote:
Originally Posted by JIRodriguez View Post

I am not sure..... but I bet this guy could tell you how to do it!

(and yes.... that is the gastank he's welding on!)

 

welding_a_gas_tank_undertruck.jpg


I sure would like to see the next few frames on that camera...
 

post #13 of 16
Quote:
Originally Posted by Beer-B-Q View Post




I sure would like to see the next few frames on that camera...
 


.... and if you look closely there is a person just off frame to the left (casting a shadow). Personally I wouldn't stand near this guy.... either the trucks gonna crush him, or explode... lol.

post #14 of 16

I don't know if you have made the cut yet but if not then here is my 2 cents.

 

I filled with water and a bottle of dawn.  Yes Propane will get into the pores of the metal and dawn will bring it out.  Have you ever seen the TV commercial where the grease disperses when the drop of detergent hits the water?  That is why you put the dawn in the tank with the water.  I filled my twice.  Let it sit about a week. 

Here is how I look at it.  Better be save than sorry.  If you can leave water in there while cutting than that is a good Idea also.

 

You can search the forum for this topic.  Others have discussed this before.

 

good luck! and show us some pics of the build.

post #15 of 16


holy crap!!!!!!!!!!!! 

Quote:
Originally Posted by JIRodriguez View Post

I am not sure..... but I bet this guy could tell you how to do it!

(and yes.... that is the gastank he's welding on!)

 

welding_a_gas_tank_undertruck.jpg

post #16 of 16

I know this is an old thread, but the tank I bought has been sitting for several years with the valves off, and this thread seemed the most appropriate

 

Any reason to take additional precautions in such a scenario?

 

I can still put water in the tank, but I assume that is just for a tank that has only recently been open to the elements?

 

Thanks!

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