Method for connecting two unitary elements of a conduit for transporting fluids by means of a sleeve

A method of connecting together two unit elements of a fluid transport pipe, each unit pipe element being made of metal alloy and being covered in an outer insulating coating made of a thermoplastic material, with the exception of an end portion that does not have an outer insulating coating, the method comprising:

• a step of welding together two unit pipe elements abutting at their end portions not having any outer insulating coating so as to form an annular cut-back;
• a step of applying an anti-corrosive barrier to a surface of the annular cut-back;
• a step of, after applying the anti-corrosive barrier, positioning an annular sleeve around the cut-back and the anti-corrosive barrier, and in part around the outer insulating coatings of the two unit pipe elements, the annular sleeve being made of a thermoplastic material;
• a step of fastening the annular sleeve in sealed manner by weld bonding on the outer insulating coatings of the two unit pipe elements;
• and
• a step of applying an external pressure on the annular sleeve to enable it to be deformed plastically and match the shape of the respective end portions of the two unit pipe elements;
• wherein the step of positioning the annular sleeve includes sliding the annular sleeve along one of the unit pipe elements.