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IRstuff - thanks for working on this. I think you are really close, but when the lift angle is 90 degrees, we know that the point moves closer by half. In your formula, it becomes 1.44 for fold angle alpha 45 degrees, and lift angle beta of 90 degrees. My mind is foggy ... back to you... thx

Oops - distance sought not clear... sorry ... Let's try this again. I am trying to figure out the distance involved: The distance is the horizontal distance that point (A) in the upper right moves toward me, (y direction) in the flat xy plane. Take a square sheet of paper, fold upper right...

I am trying to figure out the distance involved: Take a square sheet of paper, fold upper right corner (A)to lower left corner - gives a triangle. The fold angle -alpha, is 45 degrees, sloping up to your left. Unfold the paper. Now lift the upper right corner (A), by say 45 degrees, lift angle...

Thanks Stan. We will be running downhill, some slight grades, but not much more than about 15%, through really weathered volcanics. There will be occasional bends, again if we can, they will be 150 ft radius (elastic? = 50 x D). Other local irrigation ditches remove about 1/2 the material as...

Great - thanks - I thought 3 would be better(or 4), even if we have to do a lot more work to organize. Rog

Thanks for the responses. Steel is appealing since we can get it used and it's strong, especially as we get more head, we don't lose ID with thick walls. I am looking at corrosion, and I think it will be buried. If new, we could specify a slight bell for alinging sections, but a pipe supplier...

Thanks Big-inch - we can use a couple of big-inches! Surge can be a factor, but pelton wheels use deflectors to take water off the wheelfor shut-down, and spear valves (slow) to adjust flow to buckets for power. Pipe collapse under suction, if started too fast is also a potential problem...

Hello - new to the forum. Wanting to do some preliminary planning for laying 25,000+ feet of 30 inch .25 to .5 inch wall, carbon-steel pipe for hydro penstock. Want to keep costs modest for non-profit irrigation co-op. Considering used pipe - asking for one end to be flared to allow "spigot"...