Tank blanketing valves are used in many industrial sectors, for example in pharmaceutical environments, chemical & petrochemical plants and food & beverage processing facilities.
Storage tanks often contain media wherein contact with atmospheric oxygen (auto-oxidation) or mixing with other gases and/or liquids would cause harmful effects. For example, a chemical reaction could potentially create an explosive, toxic or corrosive mixture. In the food and beverage or pharmaceutical industries, cleanliness is vital as the media will likely need to be kept fresh to avoid any contamination because of microbes getting into the storage tank.
To avoid any contamination or hazardous situations in these processes, the void volume in the tank head space is filled with an inert barrier gas (as a common example, people would use Nitrogen). This process is only possible with closed containers or storage tanks. The positive pressure of this “barrier gas” is kept as low as possible, to ensure the process is cost-effective.