| 摘要 |
<p>A method of forming a pair of spaced raised seal retaining abutments (23, 24) on a tubular metal pipe (22) comprising holding the pipe (22) and applying an axial force to the pipe (22) to simultaneously or sequentially deform the pipe (22) at two axially spaced locations to form said pair of spaced raised seal retaining abutments (23, 24). A metal pipe (22) thus formed is also described, comprising a pair of axially spaced seal retaining abutments (23, 24) formed thereon by deformation of the pipe material.</p> |
