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Lp Gas Storage And Transfer
i was given some lp gas but the catch was i could take the gas but couldn't take the tank. so i transfered to small cylinders. in order to transfer to small cylinders the big tank needs to have whats called a liquid retrieval line. this is a drop pipe that pulls the liquid propane off the bottom of the tank. lp gas under pressure will have liquid on the bottom and vapor on the top. in some countries lp gas is used for a refrigerant. the small cylinders have a 80 percent bleeder. the way this works is as the liquid flows into the small tank vapor spits out the bleeder screw, when liquids starts to spit out the bleeder then the tank is 80 percent full. the screw is tightened and all valves shutoff. the small tank can only be filled to 80 percent this is a safety concern. if the tank was overfilled, if warmed up like in the hot sun the gas would expand and blow out the relief valve. this is dangerous due to the flammability of the gas.

i thought i'd post this so after a SHTF end of the world type situation and ya come across some abandoned tanks or such there is a method out there that can be used to obtain and store lp gas.

please note lp gas is very DANGEROUS. the liquid and vapor can cause frostbite, blindness,death. lp gas is very flammable and explosive if mixed in the proper proportions with air. i nor the forum is suggesting that anybody try this i merely posted this for informational and amusement purposes only.

[Image: 100_1645.jpg]

here is the bleeder screw in action during filling.

[Image: 100_1646.jpg]

here is my hose hookup to the liquid retrieval line on the top of the tank.

[Image: 100_1643.jpg]

here is a valve that i installed to control the transfer. there is a moveable seat that the pipe nipple pushes open when tightened, this allows access to the liquid retrieval line.

[Image: 100_1641.jpg]

here is another shot of a tank being filled.

You are right, that can be dangerous if one has never dealt with LP gas before. I use to fill them every once in awhile when my dad worked as an LP delivery guy. Filling up the bob-truck was even cooler though, mostly cause of the big hoses and letting off the pressure from the hose when you were done(straight into the air <img src='<#EMO_DIR#>/thumbsup.gif' class='bbc_emoticon' alt=':thumbsup:' /> ).

The "say when" valve on the truck worked the same as the bottles but was more versatile. It moved like a toilet handle inside the tank and when it dipped into the liquid it would spit. Then you could read according to the graduations along the arch of the handle what level it was at, not just when it was full. Very clever actualy.
"The general who advances without coveting fame and retreats without fearing disgrace, whose only thought is to protect his country and do good service for his sovereign, is the jewel of the kingdom." - Sun Tzu

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