tank cover dome geodesic dome TANK COVER Finding the tank cover can be very difficult and in most cases is a job for the professionals. It is very important that the tank be cleaned by removing the tank cover. The thin-shell ferrocement tank cover is designed in such a way that it can be manufactured without the use of a mould or shuttering. The aim is to reduce the cost of the tank cover by eliminating costly shuttering or moulds and by reducing the quantity of material used to manufacture the cover. Solutions are poured into the tank through the opening on the top of tank cover. This alternative method is applicable to all hard chromium electroplating and anodizing operations where a tank cover is used on the tank for reducing chromium emissions. Because the tank cover completely encloses the air above the tank, the chromium mist either falls back into the solution because of gravity or collects on the inside walls of the tank cover and runs back into the solution. A semi-permeable membrane allows passage of the hydrogen and oxygen out of the tank cover. A lit smoke device is placed inside the tank cover to detect leaks at the membrane, joints, or seals. The purpose of this engineering design file is to summarize the design of a tank cover and selection of an appropriate material. All maintenance holes shall extend through the tank cover to a point within 12 inches of finished grade. The inspection pipe shall extend through the tank cover or the maintenance hole cover, be secured, and be capped flush with or above finished grade.