equipment, especially at municipal waste water treatment plants and water treatment plants. Types FRP tanks and process vessels are used in various commercial and industrial applications, including chemical, water & wastewater, food & beverage, mining & metals, power, energy, and high-purity applications. Scrubbers FRP Scrubbers are used for scrubbing fluids. In air pollution control technology, scrubbers come in three varieties, Dry Media, Wet Media, and Biological. Dry Media Dry media typically involved a dry, solid media (such as activated carbon) suspended in the middle of the vessel on a system of beam supports and grating. The media controls the concentration of a pollutant in the incoming gas via adsorption and absorption. These vessels have several design constraints. They must be designed for Unloading and Reloading the media Corrosive effects of the fluid to be treated Internal and External Pressure Environmental Loads Support Loads for the grating and support system Lifting and Installing the Vessel Regenerating the media inside the vessel Internal Stack supports for a dual bed construction Redundancy for preventative maintenance Demisting to remove liquids that degrade the dry media Condensate removal, to remove any liquid that condenses inside the vessel Wet media Wet media scrubbers typically douse the polluted fluid in a scrubbing solution. These vessels must be designed to more stringent criteria. The design constraints for wet media scrubbers typically include: The corrosive effects of the polluted fluid and the scrubbing solution. The high pressures and loading of a spray system Aerodynamics of the internal media to ensure that there is no bypass Internal Support systems Reservoir of scrubbing fluid for recirculation. Internal and External Pressure Environmental Loads Lifting and Installing the vessel Plumbing of the scrubbing fluid to the vessel Draining to remove vessel sump fluids In the case of a decarbonator, used in reverse osmosis systems to limit the concentration of gases in the water, the air is the scrubbing fluid and the sprayed liquid is the polluted stream. As the water is sprayed out of the scrubber, the air strips the aqueous gasses out of the water, to be treated in another vessel. Biological Biological scrubbers are structurally identical to the wet media scrubbers, but vary in their design. The vessel is designed to be larger, so the air moves slower through the vessel. The media is designed to encourage biological growth, and the water that sprays through the vessel is filled with nutrients