Friatec has developed a line of vertical centrifugal pumps suitable for use in aggressive, heated and contaminated fluids. The GVSO Series of pumps is an outgrowth of the GVSN Series of vertical pumps. While the GVSN pumps are typically used for pumping sulfuric acids, liquid sulfur, tar and molten salts, the GVSO pump is being used to address new applications in the solar power generation industry. These applications utilize molten salts with temperature up to 560C. The molten salt provides for the transfer and storage of the heat. Friatec has supplied GVSO pumps for several solar plants throughout Europe. The GVSO submersible pumps used in this high temperature application are made from high-grade stainless steels with a special medium lubricated sleeve bearing concept.