Stan here you go, We use 3" cheap white irrigation pipe from HD but it really depends on the GPH of the pump as you may need larger diameter pipe. If your using three tanks you will need 4 elbows and 4 pipes. I would not make the pipes so long that your picking up the crap from the bottom of the tanks. Try to keep the suction end of the pipe about midway of the depth of the water in each tank. You will be pulling water away from the floaties and away from the bottom. Remember its better to oversize the pipes than be undersized. Once you shut your pump down the siphon pipes will balance the water within the tanks then stop flowing between tanks until you start your pump up again. To plug the 3" pipe to start the siphon use a rubber ball from the pet store. Once you have the pipe submerged completely under water plug one end of the pipe. Quickly place the pipe over the two tanks keeping the open end submerged under water as seen in the drawing and remove the ball, the flow of water will begin between the two tanks until the water level is balance. If you maintain the water level above the pipes you will never lose suction even when you shut the pump off, but it all depends on the system being completely air tight. When gluing the fittings together use plenty of primer and PVC glue to get a 100 percent bond. <img src="http://www.treasurenet.com/forums/attachment.php?attachmentid=914061"/> Got my last valve that I had been searching for along time. I had ordered one from HD but they sent me the same one I could buy off the shelve even though the picture was like below. So today I happen to be in HD and checked the bins the same bins I had checked a number of times. Somebody must have returned the valve I had bought as it was discolored. So my valve header is complete other than painting it of which I will do maybe in my down time. Going to get some help with disassembling the entire trommel and send the frame out to be powered coated a desert color so it blends in to the terrain of Arizona. JustBent has given me a hopper that's about 24" square that I will mod to fit the trommel. From there all that's left is the dump chute of which will be a rolled piece of aluminum angle and trim flush to the top rail. Because I am using Gold Hog Mats I am not just relying on the water flowing from the hopper and spray bar. The mats need to have lots of fast moving water so that they clean themselves while retaining gold. I will use the spray header currently installed on the sluice along with the water from the hopper and spray bar. My 8000GPH pump may not be enough and I may need to go with a gas powered pump. This pump will deliver 166 gallons per minute. I am hoping my electric pump will handle the flow so that we can keep the generator in the truck and use a 10-3 extension cord I have to keep the noise down near the trommel. I also re-plumbed the pump so that I have a direct flow to the spigot and trommel with a bypass to allow water to flow back into the tank if needed when the valves are turned off to the trommel. I don't want to over amp the pump by closing off valves. On the bottom of that 90 degree elbow with be another smaller valve.
On my last wash plant I used those plastic HD valves. It didn't take long before they would stick. Really hard to turn the handle, then the handle broke off. I would spend the doe and get a good brass valve. I used a jacuzzi pump. Electric with a lot of volume. I have a roller so when your ready to build your end chute, let me know.
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