Process for the positioning of a corrosion-resistant coating on a wall of an item of equipment of a FCC unit

A process for the positioning of a corrosion-resistant coating on a metal wall to be protected of a fluid catalytic cracking unit, comprising:

• (i) the shaping of a metal anchoring structure,
• in which the anchoring structure is formed from a plurality of strips connected in pairs so as to form a plurality of cells between two adjacent strips, each strip being divided along its length into a plurality of portions, including at least one series of assembly portions connected to a series of assembly portions of an adjacent strip, each strip exhibiting a first longitudinal edge and a second longitudinal edge, each second longitudinal edge exhibiting a plurality of fastening tabs of a predetermined height, each fastening tab being integral with a strip portion other than an assembly portion, wherein the fastening tabs are distant from and not contiguous to the assembly portions;
• in which, during this shaping stage, the second longitudinal edges of the strips of the anchoring structure are adapted so that a free edge of each tab of the plurality of fastening tabs is in contact with the metal wall and so that a free space is defined between the the second longitudinal edge and the metal wall,
• (ii) the fastening of the anchoring structure to the metal wall, during which, for at least a part of the plurality of fastening tabs, the free edge of the fastening tabs is welded to the metal wall,
• (iii) the insertion of a composite material:
• into the cells of the anchoring structure from the metal wall and at least up to the first longitudinal edge of each strip,
• into the space separating the second longitudinal edge of each strip of the anchoring structure and the metal wall, the height of each fastening tab being sufficient for the composite material to fill this space, wherein the anchoring structure shaped during stage (i) exhibits hexagonal cells exhibiting an even number of sides, and at least two fastening tabs integral with two opposite sides of each hexagonal cell, in which, during the fastening stage (ii), two opposite fastening tabs of each hexagonal cell are welded to the metal wall.