Patent ID: 8555932
Filing Date: 2013-10-15
Classification: E03F,F16L

Abstract:
1. A metal pipe of single piece construction comprising: a wall formed of a single corrugated metal sheet, the sheet having opposing first and second edges extending longitudinally along the sheet, the wall including a seam formed by abutting portions of the first and second edges, the seam extending helically about and along a length of the wall, the sheet having an interior wall side and an opposing exterior wall side, the interior wall side defining an interior wall surface of the wall, the exterior wall side defining an exterior wall surface of the wall, the sheet having a sinusoidal cross-sectional profile defining only 3 corrugation peaks at the interior wall surface and only 3 corrugation peaks at the exterior wall surface, the sheet having a flattened sheet width of approximately 27 inches and a finished sheet width of approximately 21 inches, the wall defining a pipe diameter of at least 96 inches.