| 摘要 |
A relatively small diameter spirally wound metal pipe has an elongate sheet of ductile material formed in a helical configuration including a radially extending lock seam (16) joining opposite edge portions of the elongate sheet together. The gauge thickness of the ductile material, the radial height of the lock seam, and the distance between adjacent lock seams are specifically sized and configured to provide a resultant pipe which optimizes the load bearing capacity of the pipe while minimizing the cost and weitht thereof. The lock seam is formed by a radially extending first U-shaped member (18) formed along the first edge portion thereof and a radially extending second U-shaped member (20) formed along the second edge portion thereof which are crimped together such that the second U-shaped member substantially envelops the first U-member to lock the first and second edge portions together.
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