Are steam pipes with a design pressure of 0.8 MPa, a design temperature of 175 degrees, and a diameter of less than 150 mm considered pressure pipes?

According to the relevant provisions in the **Standard ‘Code for Design of Pressure Vessels’ (GB 150-2011), steam pipelines are considered pressure pipelines when their design pressure exceeds 0.1 MPa and their design temperature exceeds 115°C. Since the design pressure of this steam pipeline is 0.8 MPa and the design temperature is 175 degrees, meeting the requirements of exceeding 0.1 MPa and 115°C, this steam pipeline can be considered a pressure pipeline. .

Excluded items do not include: liquefied gases, steam, and oxygen. Therefore, it belongs to pressure pipelines.

May I ask where this one comes from?

Also, if the design pressure and design temperature remain unchanged, does a steam pipe with a smaller diameter than 50 mm qualify as a pressure pipe?

Pipes with a diameter of less than DN50 are not within the scope of regulation for pressure pipes

The “Catalogue of Special Equipment” provides a definition of pressure pipelines, while the “Specifications for Pressure Pipelines – Industrial Pipelines, Part 1: General Principles” gives a definition of industrial metal pressure pipelines. Pipes with a maximum operating pressure of 0.1 MPa (gauge pressure) or more, in which the medium is gas, liquefied gas, steam, or........., and a nominal diameter of 50 mm or more...... This of yours is a pressure pipeline

The “Catalogue of Special Equipment” provides a definition of pressure pipelines, while the “Specifications for Pressure Pipelines – Industrial Pipelines, Part 1: General Principles” gives a definition of industrial metal pressure pipelines. Pipes with a maximum operating pressure of 0.1 MPa (gauge pressure) or more, in which the medium is gas, liquefied gas, steam, or........., and a nominal diameter of 50 mm or more...... This of yours is a pressure pipeline

This post was last edited by weld123 on 2023-8-5 at 11:33. According to the 2014 version of the “Catalogue of Special Equipment” issued by the General Administration, a pressure pipeline is a tubular device used for transporting gases or liquids under certain pressure. It is defined as a pipeline with a maximum operating pressure greater than or equal to 0.1 MPa (gauge pressure); the medium transported can be gas, liquefied gas, steam, or liquids that are flammable, explosive, toxic, corrosive, or have a maximum operating temperature higher than or equal to their standard boiling point. Additionally, the nominal diameter of such pipelines must be greater than or equal to 50 mm. 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. In accordance with the Notice of the General Office of the General Administration of Quality Supervision, Inspection and Quarantine regarding issues related to the safety supervision of pressure pipelines and gas cylinders (AQSIQ Special Notice [2015] No. 675): (1) Regarding the scope of media for pressure pipelines in the new “Catalogue”. The toxic, non-flammable, and non-corrosive gases referred to in the definition of pressure pipes in the new Catalogue – namely, pipes 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. Therefore, the pipeline mentioned by the original poster should be a pressure pipeline.

Extracted from the Notice on Issues Concerning the Safety Supervision of Pressure Pipelines and Gas Cylinders, Quality Inspection Office Special [2015] No. 675