Are gas pipelines pressure pipelines?
Thread Content
I have a question regarding gas pipelines: with a nominal diameter of 600 and a pressure of 10,000 Pa, do they constitute pressure pipelines? Are they subject to inspection? I’m still not sure after looking at the definition of pressure pipelines. “Regulations on the Safety Management and Supervision of Pressure Pipelines Article 3 These regulations apply to pipelines and their associated facilities that meet one of the following conditions: (1) Pipelines that transport media with a toxicity level classified as extremely hazardous, as specified in GB5044 \"Classification of Hazards from Occupational Exposure to Toxic Substances\" ； (II) Pipelines for transporting media with fire hazard categories A and B as specified in GB50160 \"Code for Fire Protection Design of Petrochemical Enterprises\" and GBJ16 \"Code for Fire Protection Design of Buildings\" ； (III) Pipelines with a maximum operating pressure of 0.1 Mpa or more (gauge pressure; the same applies hereafter), and whose transport medium is gas or liquefied gas ； (IV) Pipelines with a maximum operating pressure of 0.1 Mpa or higher, in which the fluid being transported is flammable, explosive, toxic, corrosive, or a liquid whose maximum operating temperature is equal to or higher than its boiling point ； ” As I understand it, the first, third, and fourth options certainly don’t meet the requirements. May I ask everyone, does gas meet the second requirement? I asked a construction company that has the qualifications for working on pressure pipelines, and they said that this pipeline does not fall under the category of pressure pipelines. However, according to what was mentioned in point two, it seems to be considered a pressure pipeline. Please help me figure this out
A pressure pipeline is a part of a pipe. In a broad sense, so-called pressure pipes refer to all pipes that are subjected to internal or external pressure, regardless of the medium inside them. However, since the issuance of the Regulations on the Safety Management and Supervision of Pressure Pipelines in our country, “pressure pipeline” has become a specific term for pipelines subject to supervision. Article 2 of the “Regulations on the Safety Management and Supervision of Pressure Pipelines” defines pressure pipelines as “special equipment used in production and daily life that may pose significant risks such as fires, explosions, or poisoning.” The “Regulations on the Safety Supervision of Special Equipment” issued by the State Council on June 1, 2003, further defines pressure pipelines as “tubular devices that use pressure to transport gases or liquids; these include pipes with a maximum working pressure of 0.1 MPa (gauge pressure) or more for gases, liquefied gases, steam, or liquid media that are flammable, explosive, toxic, or corrosive, and whose maximum working temperature is equal to or higher than the standard boiling point, provided that their nominal diameter is greater than 25 mm.” In other words, the so-called \"pressure pipelines\" referred to today not only mean those that are subjected to pressure inside or outside the pipes, but also those in which media such as \"gases, liquefied gases, and steam\" or \"liquids that may cause combustion, explosion, poisoning, or corrosion\" are transported. By combustible, explosive, toxic, or corrosive as mentioned here, the following is meant: The combustibility and explosiveness of the medium – that is, the medium is capable of burning or exploding under certain conditions, thereby causing fires and damage. These media include fire-hazardous substances such as combustible gases, liquefied hydrocarbons, and flammable liquids, as well as high-temperature and high-pressure media that are prone to explosion, such as steam, hot water at temperatures above its normal boiling point, compressed air, and other compressed gases. Among them, the fire hazard of combustible media is classified into three categories: Class A, Class B, and Class C, in accordance with the \"Code for Fire Protection Design of Petrochemical Enterprises\" GB50160 and the \"Code for Fire Protection Design of Buildings\" GBJ16. For gases of categories A and B, the lower explosion limit (by volume) of their mixtures with air is specified as follows: for gases in category A: <10% ； Class B flammable gases: ≥10%.
It belongs to pressure pipelines! 1. In accordance with Article 3-2 of the \"Implementation Rules for the Accreditation of Safety Units for Pressure Pipelines\" issued by the General Administration in Document No. 99 of 2000, gas pipelines fall under the category of gas pipelines (GB Class 1) within public pipelines (GB category). 2. In accordance with the provisions of Section 3, Chapter 3 of the \"Regulations on the Safety Management and Supervision of Pressure Pipelines\" (Articles 21 to 23), tasks such as route selection, design review, and completion acceptance shall all be carried out in compliance with these regulations. 3. The corresponding construction unit shall possess a GB-class construction qualification permit. For reference!
It must be! A special equipment manufacturing license is required.
Gas pipelines should be classified as GB category among pressure pipelines!
Whether a pipeline qualifies as a pressure pipeline is determined entirely in accordance with the definitions set out in the \"Regulations on the Safety Supervision of Special Equipment.\" Pipelines that fall outside the scope of these regulations may be considered pressure pipelines based on previous definitions and understandings; for example, according to the regulations regarding the safety management and supervision of pressure pipelines, such pipes might still be labeled as pressure pipelines, but in reality they are not subject to supervision. As for whether such pipes without supervision should still be called pressure pipelines, it’s up to individuals to decide. Regarding what was mentioned above about them belonging to category GB, they should fall under category GB1 if they are within the defined scope; otherwise, they do not qualify as pressure pipelines and cannot be classified as part of category GB
It must belong to that category, because it is used for transporting flammable and combustible materials
Of course it is needed; our gas stove requires a pressure of at least 1000 PA
Of course it’s a pressure pipeline; the Technical Supervision Bureau is responsible for overseeing it
Combustible gases + toxic gases are considered pressure pipelines even at atmospheric pressure.
It is certain that gas pipelines belong to pressure pipelines.
To determine whether a pipe is a pressure pipe, two prerequisites must be met: 1. The maximum operating pressure is greater than or equal to 0.1 MPa (gauge pressure); 2. The nominal diameter is greater than 25 mm. Both conditions are essential – if either one is missing, it is not considered a pressure pipe. It is not possible to classify a pipe as a pressure pipe based solely on the type of fluid it carries. There is no scientific basis for this; classification is instead carried out based on the toxicity, corrosivity, flammability of the medium, as well as its state and design pressure and temperature. There is one issue to note: when making judgments and classifications, one uses the operating pressure while the other uses the design pressure.
It must be a pressure pipeline, without a doubt!
A colleague from our company went to the quality inspection agency today to ask about it. The people there discussed it for a long time and finally said that the pressure was less than 0.1 MPa, so it couldn’t be considered a pressure pipeline. The staff at the quality inspection agency vary in competence, and they were unable to reach a decision. Does anyone with specific experience in working with gas pipelines in this area have anything to say?
Firstly, such gas pipes do not meet the requirement of 0.1 MPa (gauge pressure) specified for pressure pipelines; therefore, they are not considered pressure pipelines.
In terms of pressure level, it is not considered to be high pressure; however, the medium being transported is toxic and harmful, and it falls under the category of pressure pipelines, so this situation constitutes a pressure pipeline
The medium is a combustible gas, DN600. It definitely belongs to the GB category of pressure pipelines as specified in GB50160. This post was last edited by ghost77775 on 2009-4-30 14:31]
Pressure pipelines, similar to pressure vessels, are required to meet three conditions simultaneously: pressure, diameter, and medium. From this perspective, since the pressure is less than 0.1 MPa, gas pipelines do not fall under the category of pressure pipelines; in fact, the gas pipelines in our facility are also not managed as pressure pipelines. But as some friends mentioned earlier, pipelines for flammable and explosive media are considered pressure pipelines, which makes things a bit unclear. Has any authority issued an explanation? Looking forward to it.