Before revision: Orangeburg pipe, showing its characteristic delamination in layers of compressed oil tar pitch-impregnated ground wood fibers Orangeburg pipe (also known as "fiber conduit", "bituminous fiber pipe" or "Bermico" ) is bituminized fiber pipe made from layers of ground wood pulp fibers compressed with and bound by a water resistant adhesive then impregnated with liquefied coal tar pitch.Coal Tar Impregnated Wood Fibre Pipe", Jon C. Schladweiler, P.E., R.L.S.
After revision: or "sand pipe"Orangeburg pipe, showing its characteristic delamination in layers of compressed oil tar pitch-impregnated ground wood fibers Orangeburg pipe (also known as "fiber conduit", "bituminous fiber pipe" or "Bermico" ) is bituminized fiber pipe made from layers of ground wood pulp fibers compressed with and bound by a water resistant adhesive then impregnated with liquefied coal tar pitch.Coal Tar Impregnated Wood Fibre Pipe", Jon C. Schladweiler, P.E., R.L.S.