Pipeline design pressure issue
Thread Content
The provisions in the pressure pipeline codes regarding the design pressure for design and equipment connection. For example, a pipe with a working pressure of 0.07 Mpa is connected to a pressure vessel designed for a pressure of 0.1 Mpa. How should the design pressure be selected? It’s best to be able to avoid pressure pipelines
In such cases, the design pressure of the pressure pipeline should be set to the same level as, or higher than, that of the connected pressure vessel, namely at least 0.1 Mpa, to ensure the safe operation of the entire system. If the actual operating pressure of the pressure pipeline can be reduced by adding safety measures such as pressure relief or decompression devices, it may be possible to avoid additional requirements for the pressure pipeline. However, the safest approach is to increase the design pressure of the pipeline to ensure it is consistent with the design pressure of the pressure vessel. .
Unless the size is below 50, or the medium is non-toxic and non-flammable
To avoid pressure pipelines, one can focus on the definition of such pipelines; it has nothing to do with the containers connected to them
This post was last edited by lovepds on 2024-8-30 at 16:55. Definition of pressure pipelines: Pipelines whose maximum operating pressure is greater than or equal to 0.1 MPa (gauge pressure), whose medium is gas, liquefied gas, steam, or a liquid that is flammable, explosive, toxic, corrosive, and whose maximum operating temperature is greater than or equal to its standard boiling point, and whose nominal diameter is greater than or equal to 50 mm. This maximum operating pressure refers to the highest pressure that the medium inside the pipeline may reach during normal operation. The design pressure is set at 0.1 MPa, which does not affect the classification of the pipeline as a non-pressure pipeline
What does it mean when pipes and equipment are directly connected to form a pressure system? If a valve is installed at the outlet of a container connected to a pipeline, does that constitute a pressure system? I believe it is inappropriate to use the equipment’s design pressure as the design pressure for pipes in the specifications; neither ASME B31.3 nor GB50160 includes such a requirement. Seeking advice
For the pipeline at the container outlet, its design pressure should be no lower than that of the container; this is reasonable.
The definition of a pressure pipeline is the maximum operating pressure, not the design pressure
The red box makes it clear – it shows the overall system pressure. If the system pressure is 0.07 Mpa. Then it can be calculated at 0.07 Mpa. The connected pressure vessels are downward compatible.