If a small hole is made in a pressure pipeline, is it necessary to have it inspected by authorities responsible for pressure pipelines?
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There’s one thing I can’t figure out. There is a project in which the existing pipes are DN150, and they are GC2 pressure pipes. Now, a small DN25 injection line is to be added using a branch fitting on this DN150. I know that a DN25 pipeline is not a pressure pipeline. But it involves drilling holes in DN150 pipes to install branch pipe supports. In this case, does it constitute a pressure pipeline for the entire project? ? ? Do I need to stamp the pressure pipeline? ? ?
DN25 is not a pressure pipeline; no approval from a special inspection agency is required for the drawings, nor is it necessary to use a stamp specific to pressure pipelines.
Hello, does drilling holes in a DN150 pipe count as well? It is this very point that confuses me. I also read GBT 20801.1 Code for pressure pipelines – Industrial pipelines, Part 1: General provisions, but I didn’t understand it.
Indeed, a DN150 pipe is a pressure pipeline; drilling in such a pipe affects its pressure characteristics, so it’s necessary to submit it for inspection
It has been modified; the design institute should still produce the drawings
By the same logic, the traffic department doesn’t care if you replace the light bulbs at home, but if you want to change the model of your car’s headlights, you need to report it
In accordance with TSG D7006-2020 Rules for Supervision and Inspection of Pressure Piping, 1.2.2 Construction supervision and inspection. For pipeline renovations of less than 100 meters, no supervision is required; merely submitting a notification is sufficient.
The design institute needs to produce the drawings and issue a notification; no supervision or inspection is required, but another set of documents still needs to be prepared.