Pressure vessel
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I would like to ask the experts: Can pressure vessels be downgraded or used for a different purpose?
Downgrading is acceptable if the temperature of the process medium remains the same and the downgrade is due to a decrease in pressure; however, changing the intended use is not allowed
Those that can be downgraded to normal pressure are acceptable; the others need to be registered.
This falls under the category of modifications to pressure vessels; it requires a comprehensive inspection, after which the design and construction units shall determine the modification plan, which must then pass supervision and inspection.
Chapter 5 of TSG 21-2016 specifically sets out requirements for this issue, which falls under the modification of pressure vessels as mentioned above. It should be carried out according to the standards.
Changing the purpose constitutes a major modification to an in-service container, and the entity carrying out the modification must inform the special equipment safety supervision authority at the location of use in writing. For major renovations, it is first necessary to prepare a renovation plan, which must receive written approval from the original design firm or a design firm with the appropriate capabilities. Those that meet the requirements of Clause 6.1.2.2 of the Fixed Capacity Regulations shall undergo supervised inspection by a special equipment inspection agency with the appropriate qualifications.
This requires the approval of the local supervisory authorities...
It is permissible to use it for pressure reduction; changing its purpose falls under the category of modifications to pressure vessels. Such modifications require thorough inspection, with the design and construction teams determining the modification plan, which must then pass supervision and inspection.
Downgrading or changing the purpose depends on how you make such a change. 1. The equipment remains unchanged. It mainly depends on the requirements for the medium and operating environment specified in the as-built drawings; if these are all within the scope of your design, then it’s not necessary. 2. Changing the equipment requires registration