Identification problem of pressure pipelines
Thread Content
According to GB20801, one of the judgments of pressure pipelines is based on whether the "maximum working pressure" is greater than 0.1MPaG. Often in actual design, some gas pipelines have lower operating pressures (such as: 0.02MPaG), while the design pressure is higher, up to 0.35MPaG. In some projects, such pipelines will be directly classified as pressure pipelines, while in other projects, the above-mentioned pipelines are not considered to be pressure pipelines according to regulations. If you have encountered similar situations, please share your experience, thank you!
It is definitely not possible to use the actual pressure value as the criterion.
Sometimes the maximum working pressure is still much lower than the design pressure, and the design pressure takes more into account extreme working conditions. Moreover, the specification does not judge according to the design pressure.
According to the specific description on this table, just take the seat according to the number.
I feel that design and testing are generally determined based on design pressure.
Please take a closer look. It is still judged according to the maximum working pressure, not the design pressure.
It is still judged based on the maximum working pressure, not the design pressure.
Then I feel that if the working pressure is very low, you can follow the usual practice of taking 1.1 times and 1.15 times the maximum working pressure as the design pressure. There is no need to put it many times higher and cause trouble for yourself. The current gas design we encounter is to pay more attention to these when choosing the design pressure. I don't really understand it myself, I hope someone can explain it.
It's not based on design pressure.
It is not judged based on design pressure! The first article of GB20801 is very clear. Please ask for advice on the above issues!
1. Don’t look at the design pressure and ignore the design pressure! 2. It depends on the work pressure! If the working pressure is lower than 0.1MPa, the w pressure pipeline does not need to be used.