Are the oil storage tanks used for storing tar considered pressure vessels?

I think it should be classified as a pressure vessel. 1. Overview: Equipment in industrial production that has specific functional roles and is subjected to certain pressures is called a pressure vessel. Storage and transportation containers, reaction vessels, heat exchange vessels, and separation vessels all fall under pressure vessels. To distinguish them from ordinary containers (atmospheric pressure containers), only those containers that meet all of the following three conditions can be called pressure vessels: (1) Maximum operating pressure ≥ 9.8104 Pa (1 Kgf/cm2) ； (2) Volume ≥ 25 L, and the product of working pressure and volume ≥ 200 L.Kgf/cm2 (1960104 L.Pa) ； (3) The medium is a gas, liquefied gas, or a liquid with a maximum operating temperature higher than its standard boiling point. Pressure vessels have a wide range of uses. It is a device that plays an important role in various sectors of the national economy, such as the petrochemical industry, energy industry, scientific research, and the military industry. A pressure vessel generally consists of six main parts that make up its body: the cylinder, the head, flanges, sealing elements, openings and nozzles, and supports. In addition, it is equipped with safety devices, meters, and internal components that enable various manufacturing processes. Due to reasons such as sealing, pressure resistance, and the type of medium contained, pressure vessels are prone to explosions and fires, which can endanger the safety of people, equipment, and property as well as cause environmental pollution. Currently, countries around the world consider it an important product subject to supervision and inspection, with **designated specialized agencies carrying out such supervision, inspection, and technical testing in accordance with** established regulations and standards. 2. Classification: There are many methods for classifying pressure vessels; from the perspectives of use, manufacturing, and inspection, the following classifications exist. (1) Classified by the pressure level they can withstand: low-pressure vessels, medium-pressure vessels, high-pressure vessels, and ultra-high-pressure vessels. (2) Classified by the medium contained: non-flammable, non-toxic ； Flammable or toxic ； Highly toxic. (3) Classified by their role in the process: ① Reaction vessel: A container used to carry out the physical and chemical reactions of the medium. ②Heat exchange vessel: A vessel used to facilitate heat exchange between fluids. ③Separation vessel: A vessel used to facilitate mass exchange of media, gas purification, and the separation of solids, liquids, and gases. ④Storage and transport containers: Containers used to hold liquid or gaseous materials, storage and transport media, or to provide pressure balance and cushioning. (4) To implement scientific management and safety inspections more effectively, China’s \"Regulations on the Safety Inspection of Pressure Vessels\" classifies pressure vessels into three categories based on working pressure, the hazard level of the medium, and its role in production. Different regulations are also set for pressure vessels in each category regarding their design and manufacturing processes, as well as the inspection items, contents, and methods.

I don’t think it is a pressure vessel, for the reasons described on the second floor: To distinguish it from ordinary vessels (vessels at normal pressure), only those vessels that meet all of the following three conditions can be called pressure vessels: (1) Maximum operating pressure ≥ 9.8104 Pa (1 Kgf/cm2)； (2) Volume ≥ 25 L, and the product of working pressure and volume ≥ 200 L.Kgf/cm2 (1960104 L.Pa) ； (3) The medium is a gas, liquefied gas, or a liquid with a maximum operating temperature higher than its standard boiling point.

It must be a pressure vessel; otherwise, how could it explode?

It does not belong to pressure vessels! There are relevant standards in the reply on the second floor!

I don’t think it’s a pressure vessel; it simply doesn’t fit according to the vessel regulations.

I don’t think it’s a pressure vessel; it simply doesn’t fit according to the vessel regulations.

Of course, to determine whether it belongs to pressure vessels, one must refer to national standards!

To determine whether it is a pressure vessel, it is necessary to provide information on pressure, temperature, volume, and physical property parameters; I have no idea how the people mentioned above made their determination!