Legal analysis: pressure pipeline refers to the tubular equipment used to transport gas or liquid under a certain pressure, and its scope is defined as that the maximum working pressure is greater than or equal to 0. 1MPa (gauge pressure), the medium is gas, liquefied gas, steam or flammable, explosive, toxic and corrosive, and the maximum working temperature is higher than or equal to the standard boiling point. The pipeline with nominal diameter greater than or equal to 50 mm ... Except for the pipeline conveying non-toxic, non-combustible and non-corrosive gas and the pipeline belonging to the equipment body, the nominal diameter is less than 150mm, and the maximum working pressure is less than 1.6MPa (gauge pressure).
Legal basis: Article 99 of the State Council's Decision on Amending the Regulations on Safety Supervision of Special Equipment refers to: (3) Pressure pipeline refers to tubular equipment used to transport gas or liquid under a certain pressure, and its scope is defined as gas, liquefied gas, steam medium or flammable, explosive, toxic or usable substances with the maximum working pressure of 0. 1mpa (gauge pressure).