Method for anticorrosive protection in situ of welding joints and/or of damaged coating areas of metal pipes

A method for the anticorrosive protection in situ of a concerned portion of a pipe, comprising the steps of:

• a) preparing of a coating sheathing of a thermoplastic material, the sheathing being configured to cover the concerned portion of the pipe in a single wrapped layer;
• b) pre-wrapping of such sheathing onto a carrying roll which has a same diameter as or a larger diameter than the diameter of the pipe to be coated, and said sheathing is wrapped on said carrying roll in one single wrap layer;
• c) rotating said carrying roll carrying said sheathing around the concerned portion of the pipe so as to transpose the sheathing from the carrying roll and wrap the sheathing onto the concerned portion of the pipe in a single wrapped layer;
• and
• d) simultaneously with said rotation step, exerting a rolling pressure on the sheathing towards the underlying concerned portion of the pipe, thus obtaining a strong homogeneous adherence of the sheathing to the concerned portion of the pipe without air bubbles entrapped between the sheathing and the pipe.