Regarding the pipeline layout in the pipe gallery
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Must the pipe elevations of utility pipes such as steam, instrument air, plant air, and nitrogen in the main utility corridor be higher than those of the pipes in the branch corridors? Can the pipe elevation in the main corridor be lower than that in the branch corridors?
There’s no such item in the relevant specifications; it should be possible.
Utility pipes are generally connected according to Figure-1. Is it possible to connect them according to Figure-2?
There is no explicit requirement that the pipes in the main corridor must be at a higher elevation than those in the branch corridors; it mainly depends on the elevation difference between the outer corridor and the corridors within the boundary area. Since the construction of the outer corridor and the corridors within the boundary area is usually carried out by two different teams, it is inevitable that there may be differences in elevations, so this is understandable
Check the specifications; I think it’s to provide additional compensation. If there are no requirements in the specifications, then installation should be considered.
For Figure 2, how do I install the root valve? The pipeline is blocking the passage.