Pressure pipeline

Pressure pipelines refer to all pipes that are subjected to internal or external pressure, regardless of the medium inside them. A pressure pipeline is a part of a piping system; pipelines are used to convey, distribute, mix, separate, discharge, measure, control, and stop the flow of fluids, and they consist of pipes, fittings, flanges, bolted connections, gaskets, valves, other components or pressure-bearing parts, as well as supporting elements. Since the issuance of the Regulations on the Safety Management and Supervision of Pressure Pipelines in our country, “pressure pipeline” has become a specific term for pipelines subject to supervision. Article 2 of the Regulations on the Safety Management and Supervision of Pressure Pipelines defines pressure pipelines as: \"special equipment used in production and daily life that may pose significant risks such as fires, explosions, or poisoning.\" However, the \"Regulations on the Safety Supervision of Special Equipment\" issued and implemented by the State Council on June 1, 2003, further defines pressure pipelines as \"tubular devices that use a certain pressure to transport gases or liquids. Such pipelines are those with a maximum working pressure of 0.1 MPa (gauge pressure) or more for gases, liquefied gases, steam, or liquid media that are flammable, explosive, toxic, or corrosive, and with a maximum working temperature equal to or higher than the standard boiling point, as well as those with a nominal diameter of 25 mm or more.\" In other words, the so-called \"pressure pipelines\" mentioned today refer not only to those that are under pressure inside or outside the pipes, but also to those in which media such as \"gases, liquefied gases, and steam\" or \"liquids that may cause combustion, explosion, poisoning, or corrosion\" are transported.

If the pipe diameter is greater than DN25 and the temperature is not very high, it should be GC2 (4). It belongs to corrosion-prone liquid pipelines.

Those with a pressure greater than 0.1 MPA all fall under the category of pressure pipelines

Pipelines with a diameter of less than 25 do not fall under the category of pressure pipelines. But you can’t split a large pipe into multiple 25-pipe sections; **it will cause you trouble. :lol

Pressure pipelines refer to tubular devices that use a certain pressure to transport gases or liquids. They are defined as pipelines for gas, liquefied gas, steam, or liquid media that are flammable, explosive, toxic, corrosive, and have a maximum operating temperature equal to or higher than their standard boiling point, with a maximum operating pressure of 0.1 MPa (gauge pressure), and a nominal diameter of more than 25 mm.

What is mentioned on the 1st floor should be classified as corrosion-resistant liquid pipelines with a pressure exceeding 0.1 MPa, and thus they belong to pressure pipelines.

Thank you all for your replies. There is one more question: what exactly does \"corrosive\" mean?

Three types of pipelines: 1. Gas pipelines: ①④ 2. Liquid pipelines: ①②④ 3. Liquid pipelines: ①③④ ① Pressure ≥ 0.1 MPa ② Temperature ≥ standard boiling point ③ Flammable, explosive, toxic, or corrosive ④ Nominal diameter > 25 mm