| 摘要 |
A large diameter horizontally produced spirally formed pipe, having a diameter larger than similar pipe produced in the past, whereby said pipe will be available for use to manufacture products that have been traditionally produced by other means. This pipe is round or may be reshaped into an arch shape. As a round pipe the invention includes horizontally produced spirally formed pipes above 16 feet in diameter, and as a round pipe reshaped into an arch shape, the invention includes, horizontally produced spirally formed pipes above 16 feet in diameter before being reshaped into an arch shape.
|
