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Tool Talk Discussion Forum

Threads in propane bottle?

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Darren in TN

05-20-2004 08:23:16




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Hey, y'all.

Can anyone tell me if your garden variety 25, 33, and 100 pound propane bottles have standard threads? I'm considering using a propane bottle to replace a rusted-through tank on a compressor my father-in-law gave me.

Thanks,
Darren




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scooter

05-21-2004 18:20:49




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 Re: Threads in propane bottle? in reply to Darren in TN, 05-20-2004 08:23:16  
use em--top threads are 3/4 npt--remove valve-and create no spark--then take air hose from another compressor, and put to bottom of tank-and let air fly--will take the propane out--if if still are nervous--take 1 qt of new 30w oil-pour in tank--and roll the tank around until inside is coated in oil--then wont blow--when drill the first few holes--use a air drill no spark--build quite a few--no problems--and those tanks are tested to 1200 lbs--the walls are 1/4 inch thick---

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51 Pony

05-21-2004 17:43:39




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 Re: Threads in propane bottle? in reply to Darren in TN, 05-20-2004 08:23:16  
Darren,
It works! I used a 100# bottle a few years ago along with an old open drive refrigeration compressor, piping, pressure switch, etc. to make a compressed air system. The tank threads are 3/4" NPT. I tipped mine upside down and tee tapped it. Put a valve on the bottom and run the water out of the bottom of the tank, keeps it dry. Devil of a time getting the old pipe out though. Strapped it between two trees with ratchet straps and put a long persuader on the pipe wrench. Didn't want to heat it! Wife thinks I'm nuts. Only paid about $100 for everything. Compressor was free.

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Chris Brown

05-21-2004 13:40:33




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 Re: Threads in propane bottle? in reply to Darren in TN, 05-20-2004 08:23:16  
Yes the threads in the top of a 100 lb propane tank are standard pipe thread,Not the brass valve,those are left hand weird threads,but the ones in the steel are pipe. I have one on a air compressor, I propped the control closed and tested it from afar and it held to over 250 lbs,then I set the cut off at 135 psi. If you test it make sure theres no one around for a hundred feet or so. Could make a big bang.

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ka-boom

05-21-2004 10:21:28




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 Re: Threads in propane bottle? in reply to Darren in TN, 05-20-2004 08:23:16  
thurlow,we're talking 2 diff things.A closed pressure vessel or cut open for something.No expert,common sense and I like to be in one piece.Just have seen the results of pressure tank failure.Wrong parts,bad welds,whatever,gas (air) pressure is wicked.And yes,I've air and hydro tested things things for aliving. Hydro is safer.Not saying it should'nt be done,just trying to keep people thinking.I figured I'd ruffle someone,don't want to start a war or anything.JMO

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Al in PA

05-21-2004 08:21:55




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 Re: Threads in propane bottle? in reply to Darren in TN, 05-20-2004 08:23:16  
Check out this link. This may solve your problem.



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Dusty

05-21-2004 06:02:09




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 Re: Threads in propane bottle? in reply to Darren in TN, 05-20-2004 08:23:16  
Keep the valve that's in it, and buy a fitting to fit the outlet (left hand thread). The tank is rated at over 200 PSI.



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Slowpoke

05-21-2004 00:54:48




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 Re: Threads in propane bottle? in reply to Darren in TN, 05-20-2004 08:23:16  
There are available kits to convert a small 20# tank to a portable air tank. I don't know if it will work on the larger tanks. Tanks with old style valves can't be refilled after April 2003. Many of the 20#, 30# and 40# tanks are returned to the dealers to have the valve changed to the new style. They have the proper tools to hold the tank and remove the old valve. We don't. I tried to use a large pipe wrench on a 20# one, but couldn't hold the tank securely. So I cut a hole a few inches in diameter around the valve, removed it and welded in a short length of pipe. Then I cut off the bottom of the tank just above the curved area. I now have a very large, heavy duty..... ..... funnel.
There are millions of the old style BBQ tanks out there that have been disgarded; make use of them.

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Charles (in GA)

05-20-2004 21:03:41




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 Re: Threads in propane bottle? in reply to Darren in TN, 05-20-2004 08:23:16  
for a safer alternative, use a tank designed for air compressor use.

Link



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nwb

05-20-2004 19:41:36




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 Re: Threads in propane bottle? in reply to Darren in TN, 05-20-2004 08:23:16  
I must admit Darren that I didn't think you would get so many positve responses. (I haven't figured out if thurlow is pro or con.) Sorry that I didn't understand the threads that you were refering to. I work in a shop where things do blow up. So maybe I'm too cautious, but be careful and take precautions. Personally I wouldn't use one but others do. Good luck and be safe.



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ka-boom

05-20-2004 13:55:35




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 Re: Threads in propane bottle? in reply to Darren in TN, 05-20-2004 08:23:16  
I just love homade bombs



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Fern(Mi)

05-21-2004 03:57:48




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 Re: Re: Threads in propane bottle? in reply to ka-boom, 05-20-2004 13:55:35  
and tires blow bigger with flames, also.
Fernan



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Mike M

05-20-2004 12:01:12




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 Re: Threads in propane bottle? in reply to Darren in TN, 05-20-2004 08:23:16  
I changed the valve on a 100lb cyl. once. They are 3/4 npt I wrapped a chain around the bottle and used binders to hold it to a front end loader bucket then took large pipe wrench and it screwed right out.



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thurlow

05-20-2004 15:00:48




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 Re: Re: Threads in propane bottle? in reply to Mike M, 05-20-2004 12:01:12  
I've taken the valve out of many of 'em, after leaving the valve open and storing them upside down for a while (they make great fish cookers/turkey fryers when cut down to the right dimensions); just lay it on it's side, put a good pipe wrench on the square part..... where a wrench would go....and whack it (pipe wrench) with a sledge hammer to get it started out. Of course I had no idea they were dangerous (don't try this at home); should have asked an EXPERT; (ka-boom), maybe?????

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peter kosloski

05-20-2004 10:52:33




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 Re: Threads in propane bottle? in reply to Darren in TN, 05-20-2004 08:23:16  
Just drilled out the shutoff valve assenbly on a 25 pound bottle. Threads are not reverse on the bung just normal 3/4 NPT. Very tight and impossible to hold still, this is why I drilled / skinned it out. It was brass so eas=y drilling and no sparks. I did however leave this bottle upside down with the releif valve out of it all winter. It will still smell from the odorant but the propane is all gone.

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markct

05-20-2004 09:08:29




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 Re: Threads in propane bottle? in reply to Darren in TN, 05-20-2004 08:23:16  
yes where the brass valve goes directly into the tank the tank threads are pipe thread, but the valves are tight and you will have to realy wrench on it to unscrew it, but it can be done. i plan to use 2 100lb propane tanks for when i build my pto driven air comp which i am using a 15 hp pump head for. i will use the valve hole for air outlet, and i will weld a 2 inch bung into the bottom of the tank since i will be using them on there side i will also need to weld a small drain onto one side of the tank, dont forget you need to be able to drain the condensation or the new tank will rust out in no time.

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nwb

05-20-2004 09:04:07




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 Re: Threads in propane bottle? in reply to Darren in TN, 05-20-2004 08:23:16  
I'm no expert but the internal bottle threads are left hand. I'm not sure the pitch. Outside theads are acme. I think you'll need NPT for the compressor fittings. You'll will also need a drain. Like I said, I'm no expert. But I question drilling, tapping or doing anything to a propane tank that could cause a spark. Others will respond and give more info. Why don't you wait and see what they have to say.

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