I am guessing it would be smarter than trying to just get away with 1 3/4" back-up and using the second 3/4" for my return. Would it work to set up a Modified Bean Animal with a 1" full syphon and 2 3/4 inch back-ups? The tank side of the inlet bulkheads will. The three 1 1/2 inch standpipes form the Bean Animal overflow while there are two 3/4 inlets splitting into a total of four 1/2 inch bulkheads. The overflow is 55 centimeters deep while the outer tank has 60 centimeter high panels. So, it looks like the bulkheads I have to work with are 2X 3/4"and 1X 1". The tank is 1.5 meters square with the overflow 50 centimeters square. One full siphon, one partial /secondary drain, and one emergency. Has become more a generic name for 3 drain system. Bean animal is named after the guy who created it. The third hole is 1 and 13/16th (ish) The bulkhead that fits in there has an inside diameter of 1 and 5/16th THIS BULKHEAD FITS THE 1 INCH PVC The tanks drain-holes/bulkheads go into the overflow box, then the Bean Animal style overflow drains go to the sump. Please see the companion article: Beam Deflection Easy Engineering for Aquarists for a full explanation of beam deflection and 2nd moment of inertia formulas, parameters and calculations. (maybe it's a 16th smaller than 1 inch now that I look close) so naturally I continued to think that they were 1 inch bulkheads. This is an easy to use 2nd moment of inertia and and beam deflection deflection calculator for various beam profiles. The bulkheads that fit in these two holes have an inside diameter of 1 inch. It now looks as if I have 2 X 3/4 inch ( both of which I thought were drilled to fit 1 inch bulkheads. It seems that what I have been thinking is a 1 inch bulkhead is actually a 3/4 inch bulkhead meaning it looks like it will only accommodate a 3/4 inch pipe. The fittings themselves (elbows, couplers, etc.) are all a fraction larger to accommodate the insertion of 1" diam pipe. it seems that 1 inch (inside diameter) pipe does not fit into my "1 inch bulkhead", in the diagram the 90 elbow is marked 1 inch on the side that is saposed to fit into a 1 inch bulkhead and there is a 1 inch short piece of pipe that goes to the sanitary T after the 1 to 1.5 enlarger. This leads me to believe that I need a smaller diameter like 3/4 PVC pipe to join them. The pipe at Lowes that was stamped 1 inch has 1 inch inside diameter but the outside diameter is larger then the bulkhead hole. If you cut a 2" long piece of 1" pipe, it'll slip into the 1" bulkhead nicely, and leave enough spare pipe on t'other end to attach your fitting, yet make the joint appear "seamless". The pipe itself (not the fittings) is 1". Nope, I get that there needs to pipe to join them. Are you trying to direct connect fittings directly into the bulkhead? If so, that ain't gonna work.
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