Element for anchoring an anti-erosion coating to an inner wall of a chamber of an FCC unit
The invention relates to a metal element ( 12 ) for anchoring an anti-erosion coating that is intended to be fastened alone in an isolated manner to a metal wall or assembled with other identical anchoring elements. The anchoring element ( 12 ) has an edge ( 12 a ) for fastening to said metal wall and an anchoring body firmly attached to the fastening edge ( 12 a ) and having an upper edge ( 12 b ) that is away from the fastening edge and intended to be covered by a composite material of concrete type. A section of this upper edge ( 12 b ), which is not intended to be juxtaposed and assembled with an upper edge of an identical anchoring element, is provided with a delimiting tab ( 16 ) in order to delimit a height of composite material that must cover the upper edge ( 12 b ) of said anchoring element, said delimiting tab ( 16 ) having a delimiting edge ( 18 ) that is a predetermined distance away from a plane defined by the upper edge ( 12 b ) of the anchoring element.
1. A process for producing an anti-erosion coating on an inner or outer metal wall of a chamber of a fluid catalytic cracking unit, comprising:
(i) fastening a plurality of metal anchoring elements on the metal wall, each anchoring element being fastened alone in an isolated manner to the metal wall or being fastened to the metal wall assembled with other identical anchoring elements, the fastening being carried out by welding to the metal wall a fastening edge of each anchoring element, each anchoring element having:
a fastening edge fastened to the metal wall, and
an anchoring body firmly attached to the fastening edge, the anchoring body having an upper edge that is away from the fastening edge and defining a plane,
wherein at least one section of the upper edge, which is not juxtaposed and assembled with an upper edge of another identical anchoring element, is provided with a delimiting tab in order to delimit a height of composite material that must cover the upper edge of the anchoring element, the delimiting tab having a delimiting edge that is a predetermined distance away from the plane defined by the upper edge of the anchoring element, wherein the anchoring element is intended to be fastened to the metal wall without contact with another anchoring element, the anchoring element having a fastening edge intended to be fastened to the metal wall, and an anchoring body firmly attached to the fastening edge, the anchoring body having an upper edge that is away from the fastening edge and intended to be covered by a composite material of concrete type, the upper edge defining said plane, further characterized in that:
at least one section of the upper edge is provided with said delimiting tab in order to delimit a height of composite material that must cover the upper edge of the anchoring element, the delimiting tab having said delimiting edge that is a predetermined distance (d′) away from the plane defined by the upper edge of the anchoring element,
the upper edge of the anchoring body has an S shape, and
the section of the upper edge provided with a delimiting tab is a curved section,
(ii) applying a layer of a composite material to the metal wall, the thickness of this layer being selected so that the composite material covers or is flush with the delimiting edge of the delimiting tabs of each anchoring element and so that the remaining part of the upper edge of each anchoring element is covered by a layer of composite material, the thickness of which is at least equal to the predetermined distance.
2. The process of claim 1 wherein the delimiting tab is positioned substantially in the middle of the upper edge of the anchoring body.
3. The process of claim 1 further comprising forming the anchoring body by folding or bending a flat strip along an axis perpendicular to a longitudinal direction (L) of the strip, in the plane of the strip, and in that the delimiting tab extends in the continuation of the flat strip perpendicular to the longitudinal direction.
4. The process of claim 1 wherein the anti-erosion coating comprises at least one of the anchoring elements embedded in the composite material, the composite material extending up to the delimiting edge of the delimiting tab, above the upper edge of the at least one anchoring element, so that the composite material covers or is flush with the delimiting edge of the delimiting tab and so that the remaining part of each anchoring element is covered by a layer of the composite material, the thickness of which is at least equal to the predetermined distance.