| 摘要 |
A method of making mechanically-lined pipe 10 comprises primary expansion by plastically expanding a liner sleeve 14 within an outer pipe 12, under lining pressure applied internally to the liner sleeve 14. On relieving the lining pressure, elastic radial contraction of the outer pipe 12 makes a mechanical bond 26 between the outer pipe 12 and the liner sleeve 14. Then, secondary expansion of the outer pipe 12 is performed under fixing pressure, which may be greater than the lining pressure, applied internally to the liner sleeve 14 at an end portion of the pipe. This makes or strengthens a mechanical bond at the end portion. The resulting pipe joint comprises an end portion and a body portion inboard of the end portion. The body portion has a first, lesser bonding pressure between the outer pipe 12 and the liner sleeve 14. The end portion has a second, greater bonding pressure between the outer pipe 12 and the liner sleeve 14. An overlay can be applied to the end portions, chemically or metallurgically bonding the liner sleeve to the outer pipe. |
