Is a pipeline with a maximum operating temperature of over 100°, using water as the medium, a DN50 size, and an operating pressure of 0.1 MPa considered a pressure pipeline?

This post was last edited by bfdlwolf on 2018-12-29 at 14:30. Announcement by the General Administration of Quality Supervision, Inspection and Quarantine on the Revision of the “Catalogue of Special Equipment” (No. 114, 2014). Pressure pipelines refer to tubular devices that use a certain pressure to transport gases or liquids. They are defined as pipelines with a maximum working pressure of 0.1 MPa (gauge pressure) or more, carrying gases, liquefied gases, steam, or liquids that are flammable, explosive, toxic, corrosive, and have a maximum working temperature equal to or higher than their standard boiling point, and with 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. Among them, the safety supervision and management of oil and gas pipelines shall also be carried out in accordance with laws and regulations such as the Work Safety Law and the Oil and Gas Pipeline Protection Law. Notice from the General Office of the Quality Inspection Administration on Issues Related to the Safety Supervision of Pressure Pipelines and Cylinders (Quality Inspection Office Special [2015] No. 675) “I. Issues Related to the Safety Supervision of Pressure Pipelines (1) Regarding the range of media used in pressure pipelines as specified in the new ‘Catalogue’. The toxic, non-flammable, and non-corrosive gases referred to in the definition of pressure pipelines in the new Catalogue – namely, pipelines with a nominal diameter of less than 150 mm and a maximum operating pressure of less than 1.6 MPa (gauge pressure) that transport such gases – do not include liquefied gases, steam, and oxygen. ” Pipes with a maximum operating temperature of over 100°, using water as the medium, with a DN50 size and an operating pressure of 0.1 MPa are considered pressure pipes

Well, and how much traffic do you have? Is a DN50 diameter too small? Is the fluid in these pipes boiler water? There is likely to be two-phase flow.

It is a pressure pipeline; its temperature exceeds its standard boiling point, that’s the point