Abstract: A method of applying corrosion resistant liners to the structural steel walls of flue gas lines, flue gas treating apparatus, scrubbers and the like. The wall to be protected is provided with spaced apart bores and the liner sheets are applied to the inner surface of the structural steel wall. The studs are joined to the sheets by stud welding and the sheets are then drawn tightly against the wall by the application of tensile forces to the studs. The studs are subsequently gas tightly joined to the wall, e.g. by welds. An alternative method of attachment uses a screw thread on the stud and the nut which is threaded onto the stud and bears against a washer and a sealing ring which is pressed against the wall around the stud.

Abstract: In order to improve the arrangement and fixation of corona electrodes in a tensioning frame it is proposed to provide the corona electrodes with end portions which are semicircular in cross-section. This will permit the end portions of the electrodes to be joined to the tubes of the tensioning frame by welding at two points whereas the corona points need not be appreciably spaced from the electrical center.