Arrangement for the treatment of cellulose pulp in a washing apparatus arranged with a reinforcing frame

A washing apparatus for washing cellulose pulp comprising:

• a rotatable drum including a plurality of outer compartments for the cellulose pulp to be washed, said plurality of outer compartments defined by axial compartment walls distributed along the circumference of said rotatable drum,
• a stationary cylindrical casing comprising a pair of opposite gables, enclosing said rotatable drum, whereby an annular space is defined between said stationary cylindrical casing and said rotatable drum,
• a plurality of seals arranged on said stationary cylindrical casing so as to create seals between said stationary cylindrical casing and said axial compartment walls, thereby dividing said annular space into a formation zone for forming said cellulose pulp in said plurality of outer compartments of said rotatable drum, at least one washing zone for washing said formed pulp at an overpressure, and a discharge zone for discharge of said washed pulp from said annular space;
• and
• at least one reinforcing frame rib, attached to said stationary cylindrical casing between said pair of opposite gables,
• said at least one reinforcing frame rib extending around said entire stationary cylindrical casing for fixing said casing in a predetermined form, whereby detrimental deformation of said stationary cylindrical casing during washing of said cellulose pulp in said at least one pressurized washing zone is prevented, said stationary cylindrical casing forming a longitudinal discharge opening, relative to the axial extension of said rotatable drum, for washed pulp that is discharged from said discharge zone, and wherein said at least one reinforcing frame rib extends across said discharge opening of said stationary cylindrical casing.