| 摘要 |
A method of expanding a tubular element (32) is provided, the tubular element (32) having a first portion (41) to be expanded to a first inner diameter and a second portion (38) to be expanded to a second inner diameter larger than the first inner diameter. The method comprises: a) arranging an expandable sleeve (36) of selected wall thickness in said second tubular element portion (38); b) positioning an expander (1) in the tubular element (32) ; c) operating the expander (1) so as to expand said first tubular element portion (41) to the first inner diameter, and operating the expander (1) so as to expand the sleeve (36) .to an inner diameter substantially equal to the second inner diameter minus double the wall thickness, of the sleeve (36); and d) retrieving the sleeve (36) from the tubular element (32) .
|
