Non pressure tanks are fabricated in configurations including: above ground or underground installation, single skin or double skin, with main axis in horizontal position or vertical position. Tanks are constructed in accordance with EN 12285-1, EN 12285-2, DIN 6618-1, DIN 6618-2, EN 13445 and can be fabricated in carbon steel, stainless steel or combination of thereof. Internal surfaces of carbon steel tanks may be coated with epoxy coating or rubberized while stainless steel surfaces may be etched and passivated. Options include heating by means electrical resistance heating or thermal oil heating, insulation, instruments, service wells, valves and assemblies including pumps and control cabinets. Standard solutions are available for tanks up to 200 m³.