There is a great reference for steel Penstocks and their design, ASCE MOP 79. A new version will be available in the next two months if you can wait that long.
To your original post, buried steel pipe is commonly lined and coated with cement mortar (at least in North America), the protection...
AWWA C200 is for the manufacturing of steel water pipe, it includes references to ASME IX and AWS D1.1 for welding procedures. For field joint welding of steel water pipe AWWA C206 is the appropriate standard from that series.
I agree however, ASME B31.3 may be the correct pipe standard for...
