When mist eliminator has been installed in vessel, it often requires welding new support rings, beams, clips and other structures to the vessel wall. For avoid recertified of the vessel, the other method is offer expansion rings that are made in sections that can be passed through a manway. the rings are then bolted together and wedged against the vessel wall without welding. The unique double expansion design ensures that the installed ring does not move during operation. Once the rings are installed - either in vertical or horizontal vessels - beams can be bolted to the rings and complete housings can be built up inside the vessel.