Regarding the issue of the connection method for 20MP high-pressure pipelines
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Is it appropriate to use threaded connections for pipelines with a pressure rating of 20 MPa? If not, why do so many components capable of withstanding pressures above 20 MPa employ threaded interfaces? If threaded connections can be used, can flexible connectors also be used for threading purposes? Please provide an expert answer. PS: The maximum diameter of the pipelines is DN25, and the medium is nitrogen
Hello, the original poster: For high-pressure pipelines, threaded connections are generally not used; welding is the suitable method of connection. Therefore, there is no need to analyze the relevant issues any further. In that case, it can be said that the strength of weld connections is far greater than that of threaded connections·····
High-pressure applications use threaded flanges; in particular, threaded flanges are used in the production of synthetic ammonia and fertilizers. Refer to the Soviet standard H1~31-67: http://bbs.hcbbs.com/viewthread.php?tid=214976&pid=936766&page=1&extra=page%3D1#pid936766
Small pipes are fine; they are easy to maintain and disassemble.
It’s best not to use threaded connections; it’s better to weld them in place to avoid any potential problems
High-pressure pipelines should be connected by welding; for joints that cannot be welded, threaded flanges must be used. Note: Threaded flange connections are not the same as threaded connections!
Thank you all for your guidance~ I’ll do some further research; mainly, many of the components have small diameters and are connected using threads
For smaller pipe diameters, threaded connections can be used. Note that, as the user above mentioned, flanged threaded connections are different from regular threaded connections
If flange threading connections are not absolutely necessary, welding can be used instead; it is more durable and less prone to leakage. However, in processes such as medium-pressure methanol oligomerization in oxygen synthesis plants (with a design pressure of 220 MPa) and ammonia synthesis processes (with a design pressure of 320 MPa), flanges are connected using threading
Are high-pressure pipelines connected using threads? You’re not joking about taking lives, are you? Welding or flange connection is generally used.
What the original poster mentioned – that \"components capable of withstanding pressures above 20 MPa all use threaded connections\" – probably refers to hydraulic pipelines; in ordinary process pipelines, threaded connections are hardly used at such high pressures.