Patent ID: 8117724
Filing Date: 2012-02-21
Classification: F16L,Y10T

Abstract:
1. A method for joining together steel pipes for conveying fluids under pressure, comprising the following steps: a) identifying in a pipe a pipe section to be replaced and intercepting, by fastening stopper systems at suitable points, the fluid flow inside the pipe upstream and downstream of the pipe section; b) after the fluid flow has been intercepted, removing the pipe section to be replaced so as to obtain upstream and downstream thereof a first and a second pipe section; c) inserting along each of the first and second pipe sections a protective stopper, chamfering the edges of the first and second pipe sections and then mounting a first and second sliding sleeve provided with sealing means; d) removing the protective stoppers from the first and second pipe sections and positioning between them a new connection piece, such as a pipe section, a branch-off piece, or a valve; e) displacing the first and second sliding sleeves on these first and second pipe sections so that the sealing means are arranged on the new connection piece; and f) fixing the first and second sliding sleeves to the first and second pipe sections and to the connection piece.