A vessel tank is a sealed container designed to hold liquids, gases, or other substances under various pressure and temperature conditions. Commonly referred to as a pressure vessel or storage tank, it is widely used in industries such as chemical processing, oil and gas, water treatment, and food production. Vessel tanks can be horizontal or vertical in orientation and are constructed from materials like carbon steel, stainless steel, or composite materials, depending on the application. They may include fittings, nozzles, manways, and safety devices to manage pressure and facilitate access, inspection, or cleaning.