How should this situation with classified pressure vessels be handled?
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There is a chemical manufacturing company. Six years ago, pressure vessels of certain categories (including spherical tanks manufactured either in the factory or on-site) were installed at the site, and notification of the installation was submitted; however, registration for use was not carried out. Due to financial issues, the project was not launched, and the installations remained unused for 6 years. Now the project is set to be restarted. Visually inspecting these pressure vessels of the relevant categories (including those spherical tanks manufactured either in the factory or on-site), it can be seen that the carbon steel ones are corroded, while those made of stainless steel show little signs of corrosion. Are there any requirements outlined in the supervision regulations or standards regarding such situations before they are put into use? For example, is it necessary to conduct another hydrostatic test? What are the requirements, etc.? If not, can it be used directly?
Whether there are rules or not. As a responsible company, after such a long time, it is necessary to carry out some required tests to ensure safe production.
If you can’t understand the textual definitions related to pressure pipes, here’s a more intuitive explanation: The pressure grades of pipes are generally classified as: vacuum/atmospheric pressure (0)/0.25/0.6/1.0/1.6/2.5/4.0/6.3/10. . . MPa class, low-pressure pipelines: less than 1.6 MPa: ； Medium-pressure pipeline: 1.6-4.0MPa ； High-pressure pipeline: 4.0-10MPa ； Ultra-high pressure pipelines: greater than 10 MPa. Atmospheric pressure pipeline: 0MPa
Regardless of the medium, temperature, purpose, or material, as long as the pressure gauge on the pipeline shows pressure, it is considered a pressure pipeline. That’s all there is to it.
Apply for inspection at the local special inspection agency
“\"Submit it to the local special inspection agency for inspection\" – are the inspectors provided by the special inspection agency? Should the property owner find a construction company themselves to carry out the inspection?
Definitely don’t skip the inspection – do it once to feel more at ease!