Regarding the inspection plan for refining units
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If the refineries in the north shut down during winter, how should they check whether the internal vessels, equipment, and process pipelines have been damaged as a result of the winter period after operations resume? Specific measures and requirements? I hope those with experience can discuss this in detail.
I believe that the relevant medium pipelines must be isolated before shutting down the operation, by installing blind flanges or disconnecting the flanges. Blow out the materials in the equipment pipelines using nitrogen or unpurified air. When starting up again, a purging inspection must be carried out. The equipment requires regular and scheduled maintenance over the long term to ensure smooth resumption of operation.
1. Carry out proper anti-freezing and anti-condensation measures. 2. In the event of shutdown with no fluid flowing, ensure that low points in equipment, pumps, towers, pipelines, etc. are drained of condensate; keep instrument air lines, steam lines, circulating water lines, and cooling water lines continuously flowing. 3. Assign a dedicated person to oversee the anti-condensation equipment and conduct regular inspections
It should be taken care of before shutting down operations: all fluids must be removed, the system should be purged with steam and then cleaned with air before going into winter. After winter, before resuming operations, it is necessary to verify again whether there is water in containers, equipment, pipelines, etc., and to check whether gaskets have cracked due to freezing; the inspections must be thorough and careful