Pressure pipeline – steam pipeline: Is it possible to use an elbow with a DN80 opening in a DN120 pipeline?
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There is a location at the construction site where a reducing tee DN120-DN80 was designed to be used. The workers couldn’t find this reducing tee, so they proceeded with welding directly. Is this acceptable?
This approach is acceptable, but it must comply with the welding and design specifications for pressure pipelines, to ensure that the strength and sealing properties of the welds meet the required standards. For the eye-of-the-tube fitting, it is necessary to ensure that the location and dimensions of the openings are correct, and that the welds are even and free of defects. If in doubt, it is best to consult a professional engineer or check the relevant specifications and standards. .
Yes, but a reinforcement calculation report for the openings is required.
It is an established fact that the construction was not carried out in accordance with the design, and the calculation documents were added later.
Low pressure is fine; high pressure requires reinforcement.
This still needs to be discussed with the design team to see if they can make the changes. Of course, accurate strength calculation is indeed crucial, but it’s also necessary to obtain the other party’s consent; once this issue arises in the future, things will get complicated. (For example, third-party inspection)
DN120? There’s no pipe of that diameter, right?
1. The pipe with DN120 should be DN125. 2. In that case, there is a problem with the piping layout; a distributor should be designed at this location