How to distinguish between pressure vessels and pressure pipes?
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There is such a piece of equipment or a section of pipe, DN200, length 5-10 meters, medium steam, pressure 5MPa, with or without flanges at both ends. Is it a pressure vessel or a pressure pipe? Because it is necessary to distinguish the problem of which professional is doing it, if the equipment is professionally done, but it is not required to be classified, is it appropriate?
Look at what the function of this thing is, whether it is used to transport media, if it is not used for transporting, it is equipment, if it is used for transporting, it is pipeline. Pipes are devices connected by pipes, pipe connectors and valves for transporting gases, liquids or fluids with solid particles.
It should be a craft major, this is not a device at all.
1. If it has flanges at both ends and is independently fixed and installed somewhere, it should be classified as a pressure vessel and classified as Category II based on the parameters provided and Articles 2 and 6 of the "Capacity Regulations". 2. If there are no flanges at both ends and are directly connected to the pipeline system, it can be treated as a pressure pipeline. 3. If it is classified as equipment (pressure vessel), it must be designed, manufactured, inspected, and accepted in accordance with GB150, "Capacity Regulations" and other standards and specifications. For reference!
Thank you all, if the equipment is made according to the technical requirements of the boiler, can it avoid the classification problem?
Pressure vessels are used for reactions and loading, and pipes are used as channels for fluids.
It is obviously a pressure pipeline. According to the "Special Equipment Safety Supervision Regulations", it is a special equipment. It is an equipment in terms of management and a process in terms of professionalism.
Personally, I think they should be distinguished according to their uses. There are many similar tubes. The key depends on whether they are storage media or transport media. The storage medium is the container, and the transport medium is the pipeline!
Not sure what LZ wants to know? The definitions of boilers, pressure vessels, and pressure pipelines in the "Special Equipment Safety Supervision Regulations" are provided for your reference! Excerpt from Article 99 of the Regulations. The meanings of the following terms in these Regulations are:: (1) Boilers refer to equipment that uses various fuels, electricity or other energy sources to heat the contained liquid to certain parameters and output heat energy to the outside. Its scope is defined as pressure-bearing steam boilers with a volume greater than or equal to 30L. ； Pressure hot water boilers with outlet water pressure greater than or equal to 0.1MPa (gauge pressure) and rated power greater than or equal to 0.1MW ； Organic heat carrier boiler. (2) Pressure vessels refer to closed equipment that contains gas or liquid and carries a certain pressure. Its scope is defined as fixed containers and mobile containers for gases, liquefied gases, and liquids whose maximum working temperature is higher than or equal to the standard boiling point. The maximum working pressure is greater than or equal to 0.1MPa (gauge pressure), and the product of pressure and volume is greater than or equal to 2.5MPa·L. ； Cylinders containing gases, liquefied gases and liquids with a standard boiling point equal to or lower than 60°C whose nominal working pressure is greater than or equal to 0.2MPa (gauge pressure), and the product of pressure and volume is greater than or equal to 1.0MPa·L ； Oxygen chamber, etc. (3) Pressure pipelines refer to tubular equipment used to transport gas or liquid using a certain pressure. Its scope is defined as gas, liquefied gas, steam media with a maximum working pressure greater than or equal to 0.1MPa (gauge pressure) or flammable, explosive, toxic, corrosive liquid media, a maximum working temperature higher than or equal to the standard boiling point, and pipes with a nominal diameter greater than 25mm. Notice: Whether it is a boiler, pressure vessel or pressure pipeline, there are corresponding supervision regulations, specifications, and standards, and they must be implemented in accordance with them!
Pressure vessel: refers to a sealed device that holds gas or liquid and carries a certain pressure. If it cannot be sealed, even if it holds gas or liquid, it is not a pressure vessel, but a pipeline used to transport media.
The product of volume and pressure is less than 2.5Mpa.L, so it should not be a pressure vessel.
If the transportation properties can be classified, they can be directly treated as pressure pipelines to avoid classification. Why did the original poster make it so complicated?
It feels a bit like Harry Potter and the Chamber of Secrets. If the containers and pipelines must bear pressure, they must comply with pressure regulations, such as high-temperature and high-pressure reactions, then intermittent is more cost-effective than continuous, because continuous requires all process pipelines to withstand high temperature and high pressure, while intermittent can partially withstand high temperature and high pressure. Save a lot.
Regarding the classification of pressure vessels and pressure pipelines, judging from the questions raised, the distinction is for the management of special equipment. For this purpose, I personally believe that distinguishing between pressure pipelines and pressure vessels has no practical significance. From a management perspective, distinguishing between pressure vessels and pressure pipelines is only for the convenience of management. The two types of equipment are not absolutely opposite. Or it is either/or, so the dogmatic distinction is moot. Of course, this explanation is not an excuse for companies to lower their security requirements. We hope that enterprises and management departments can correctly understand this explanation.