Do nitric acid pipelines belong to pressure pipelines?

Yes, nitric acid pipelines are considered pressure pipelines. Nitric acid is a hazardous chemical that is flammable, explosive, and highly acidic; therefore, high-pressure containers or pipelines are required for its storage and transportation during handling. These pipes usually require special design and manufacturing to ensure they can safely and stably withstand the high pressure and corrosiveness of nitric acid. Therefore, nitric acid pipelines are considered pressure pipelines and require strict adherence to relevant safety procedures and standards. .

Pressure pipelines have defined requirements; they must meet certain conditions in order to be classified as such.

Pressure pipelines refer to tubular devices that use a certain pressure to transport gases or liquids. They are defined as pipelines with a maximum operating pressure of 0.1 MPa (gauge pressure) or more, whose medium is gas, liquefied gas, steam, or liquids that are flammable, explosive, toxic, corrosive, and have a maximum operating temperature equal to or higher than their standard boiling point; such pipelines also have a nominal diameter of 50 mm or more. Except for pipes with a nominal diameter of less than 150 mm and a maximum operating pressure of less than 1.6 MPa (gauge pressure), as well as the pipes that form part of the equipment used for transporting non-toxic, non-flammable, and non-corrosive gases. Nitric acid is a strong acid with corrosive properties. According to the definition of pressure pipelines, its material properties meet the requirements; next, it is necessary to check whether the pressure and pipe diameter are at least 0.1 MPa and DN ≥ 50 respectively

Pipelines with a nominal diameter of DN50 or greater are considered pressure pipelines

According to page 1 of the standard \"Design and Engineering Applications of Pressure Piping, 3rd Edition\": Nitric acid pipelines must meet three conditions – an diameter larger than DN50, a design pressure greater than 0.1 MPa, and a corrosion rate for 20 steel at 20 degrees Celsius of more than 6.25 mm/year – in order to be considered pressure pipelines

Pressure pipelines have defined requirements; they must meet certain conditions in order to be classified as such. There are not only medium requirements but also pressure specifications. If there is no pressure inside the pipeline, it is not considered a pressurized pipeline