Welding of the pipe spools within the thermal barriers to the thermal barrier bottom/end plates.(The pressure test of those piping spools shall be carried out after welding to the bottom/end plates).Shell plates cut to shape, rolled, and pressed for the inner and outer tank with edges prepared for welding.Carbon steel outer-tank shell and roof plates shall be primer-coated on the surface required for field top coating(s), except 50mm (2 in) from the edges for field welding.