Does a DN25 pipe with a pressure of 25 Mpa qualify as a pressure pipeline?
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The latest version of the catalog of special equipment defines pressure pipelines as those with a pressure greater than 0.1 Mpa and a pipe diameter of 50 mm or more. So, for gas station pipelines with a DN25 size and a pressure of 25 Mpa, do they not fall under the category of pressure pipelines? ?
That’s the rule, but are there any other regulations for special industries such as your gas stations? It doesn’t fall under that category, but it should be subject to intensive monitoring and management, right?
Is it more accurate to say that it belongs to pressure pipelines, but is not within the scope of inspection by the boiler inspection agency? ?
It should no longer be considered a pressure pipeline
It falls outside the scope of pressure pipelines supervised and managed by the quality supervision department.
Is it definitely 25 MPa? Such a thin tube
It falls under pressure pipelines; **there’s no need for acceptance testing.**--------
On October 30, 2014, the General Administration of Quality Supervision, Inspection and Quarantine issued a announcement regarding the revision of the “Catalogue of Special Equipment” (No. 114 of 2014), which adjusted the definition of pressure pipelines. A pressure pipeline refers to a tubular device that uses certain pressure to transport gases or liquids; it is defined as a pipeline with a maximum operating pressure of 0.1 MPa or more (gauge pressure), using gases, liquefied gases, steam, or liquids that are flammable, explosive, toxic, corrosive, and have a maximum operating 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. By referring to this definition, it is possible to determine whether it is a pressure pipeline.
For the regulations regarding the inspection of pressure pipelines, reference can be made to Articles 116 to 124 of Chapter 6, Regular Inspections, in TSG D0001-2009, Safety Technical Supervision Regulations for Pressure Pipelines.
Does LO (lubricating oil) fall under the category of pressure pipelines? With a pressure of 2.75 MPa, it does not fall into this category according to the regulations; is it necessary to submit a report for approval?
Lubricating oil is a flammable liquid; its fire hazard classification is Class C. The pressure is 2.75 MPa, which is greater than 0.1 MPa. What size should the pipes be? Those larger than DN50 fall under the regulatory scope of pressure pipelines and require inspection.