Elmer W3TDH Posted March 29, 2022 Elmer Share Posted March 29, 2022 (edited) On the subject of fuel supplies, if you are going into a large disaster area you will need a way to get fuel out of underground tanks without needing electrical power. That is especially true if the rules, governing your particular transportation means, prevent you from carrying any fuel with you. One remedy, which worked for me, was to make a long suction pipe for a rotary vane drum pump like the one shown in this photograph. The reason for using of a rotary vane pump is that it is a positive displacement pump. That means that it can pump any fluid including air. By taking air out of the intake pipe you lower the pressure inside the pipe so that the 14.7 pounds of normal atmospheric pressure can force the fuel up the pipe. No foot valve is used so that when the pump is to be taken apart the fuel in the intake pipe will readily drain back into the underground tank. A small air inlet valve just below the pump can be used to allow air to enter the pipe from the top so as to reduce spillage when the intake pipe is detached from the pump. Some rotary vane pumps can be turned in reverse to empty the fuel in the pump body back down the intake pipe. Use 5 foot long pieces of threaded rigid aluminum conduit which will connect to each other using aluminum couplings. Aluminum is used for it's lower weight. The first piece will have to have a ~6 inch capped stub out of one end of a straight condulet; see photograph; to keep the intake up off of the very bottom of the tank. That avoids taking sludge up with the fuel. The condulet will be the suction strainer for fuel flowing into the intake pipe. The opening of the condulet can be covered with course screening to keep larger semi solid contaminants out of the fuel. Using a jig saw cut all but the rim out of the condulet's cover. Place screening, such as 1/8 inch hardware cloth, over the opening and fasten the cover's rim over it. There is no reason to try to seal the edge because any leakage will be through gaps that are smaller than the 1/8 inch square openings in the hardware cloth. With the conduit made up in 5 foot lengths it will be transportable. Attach rolls of Teflon pipe sealing tape to the drum pump's handle using Ty-Raps®. I will be needed to make an airtight seal when the conduit lengths are assembled into an intake pipe. 2 V jaw pipe pliers should also be part of this kit. Tom Horne W3TDH Edited March 29, 2022 by W3TDH correct some syntex. 1 Link to comment Share on other sites More sharing options...
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