Classification of pressure pipelines

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I came across some regulations regarding the classification of pressure pipelines and didn’t want to keep them to myself. 2.1 Scope of pressure pipelines 2.1.1 Pipelines that transport media with an extreme hazard level as specified in the \"Classification of Hazards from Occupational Exposure to Toxic Substances\" (GB5044-1985). 2.1.2 Pipelines carrying Class A and Class B media are considered to be of high fire hazard as specified in the \"Code for Fire Protection Design of Petrochemical Enterprises\" (GB50160-1999) and the \"Code for Fire Protection Design of Buildings\" (GB50016-2006). 2.1.3 Pipelines with a maximum operating pressure of ≥0.1 MPa (gauge pressure) and carrying gaseous or liquefied gases as the medium. 2.1.4 The maximum operating pressure is ≥0.1 MPa (gauge pressure); it applies to pipelines that transport flammable, combustible, toxic, corrosive liquids, or liquids whose maximum temperature is equal to or higher than their standard boiling point. 2.1.5 Auxiliary facilities and safety protection devices for pipelines as specified in the first four items. 2.2 Circumstances in which the \"Regulations on the Safety Management and Supervision of Pressure Pipelines\" and the \"Procedures for the Certification and Management of Units Engaged in the Design of Pressure Pipelines\" do not apply are specified in Article 4 of Chapter 1 of the \"Regulations on the Safety Management and Supervision of Pressure Pipelines\" and Article 3 of Chapter 1 of the \"Procedures for the Certification and Management of Units Engaged in the Design of Pressure Pipelines\": 2.2.1 Pipelines belonging to the equipment itself ； 2.2.2** Piping in equipment, vehicles, and nuclear installations ； 2.2.3 Pipelines for transporting non-toxic, non-flammable, and non-corrosive gases, with a nominal diameter of <150 mm and a maximum operating pressure of <1.6 MPa (gauge pressure) ； 2.2.4 Domestic gas pipelines prior to the final valve before entering the building (residential building, courtyard), and heating pipelines after the heating points (excluding the heating points themselves). Points 2.1 and 2.2 above indicate that ① the term \"pipeline\" in pressure pipelines refers to pipelines, pipeline accessories, and safety protection devices. ②In chemical engineering design, except for the pipes that belong to the equipment itself, those used to transport non-toxic, non-flammable, and non-corrosive gases, as well as pipes with a nominal diameter of <150 mm and a maximum operating pressure of <1.6 MPa (gauge pressure), all other pipes are considered pressure pipes. ③Pipelines that transport extremely hazardous media and media with Class A or B fire hazards are considered pressure pipelines, regardless of whether they are gases or liquids, and regardless of the operating temperature and pressure. ④Maximum operating pressure of the carrier gas (vapor) or liquefied gas ≥ 0.1 MPa (gauge pressure) ； Pipes that are non-toxic, non-flammable, and non-corrosive, with a nominal diameter of ≥150 mm and a maximum operating pressure of ≥1.6 MPa (gauge pressure), are considered pressure pipes. ⑤The maximum operating pressure is ≥0.1 MPa (gauge pressure); pipelines that transport flammable, combustible, toxic, corrosive liquids, or liquids whose maximum temperature is equal to or higher than their standard boiling point, are considered pressure pipelines. ⑥Water pipes commonly used at temperatures below 100°C, as well as nitrogen and air pipes with a pressure of P<1.6 MPa (gauge pressure) and a diameter of DN<150 mm, do not fall within the category of pressure pipes.