METHOD FOR CONTAMINATION PREVENTION IN FLUID STORAGE TANK REQUIRING TEMPERATURE CONTROL, AND DEVICE THEREFOR

摘要

An object of the present invention is to provide a method and a plant for preventing contamination of a fluid in a fluid storage tank with a liquid cooling or heating medium. In a method of controlling a temperature of a fluid in a fluid storage tank 2 under a predetermined pressure by allowing a liquid cooling or heating medium to flow in an enclosed pressure-resistant jacket 4 provided around the outer wall of the fluid storage tank, said method comprises allowing the cooling or heating medium to flow in the enclosed pressure-resistant jacket 4 at a pressure not higher than the pressure x (atm) applied within the fluid storage tank 2, preferably lower than x (atm), whereby preventing contamination of said fluid with said cooling or heating medium. A plant for the method is also provided.