What requirements must be met when increasing the working pressure of buried steel gas pipelines?

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This post was last edited by chuane on 2018-1-24 at 10:40. A gas company intends to change the operating pressure of its existing buried public gas pipelines with a diameter of DN350*16 mm, made of 20# seamless steel pipes, from the original design pressure of 0.4 MPa (GB1-Class V) to a higher design pressure of 3.3 MPa (GB1-Class I). I would appreciate it if the experts on Haichuan Forum could offer some advice on how to carry out the voltage increase process in a compliant and legal manner, while also ensuring operational safety. It can be discussed from the following perspective: 1. Design aspect: (feasibility study – design calculations – construction drawings, etc., explained from a negative standpoint). 2 Installation aspects: For cross-level voltage boosting, what aspects should be given special attention during installation? 3. Acceptance aspects: proportion of non-destructive inspections, differences in visual inspection, requirements regarding the surrounding environment, etc. 4 Regulatory aspects: An application for increasing the pressure of this pipeline must be submitted to the relevant regulatory authorities; procedures for doing so need to be followed. 5 Other aspects: For anything not covered above, feel free to share your ideas and offer as many suggestions as possible.