There are probably better examples, but I love the Australian Snowy Mountains Hydro Scheme as an example of huge pipes used for penstock. http://farm5.staticfl

There are probably better examples, but I love the Australian Snowy Mountains Hydro Scheme as an example of huge pipes used for penstock. http://farm5.staticflickr.com/4061/4391493249_8332c6f014_o.jpg http://farm5.staticflickr.com/4061/4391493249_8332c6f014_o.j...