Hot work on concentrated sulfuric acid pipelines
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There is a weld leak in the stainless steel pipeline used for 98% concentrated sulfuric acid, and welding is required. What measures need to be taken with the pipeline before carrying out welding work to ensure safety during the operation? Is it necessary to purge and replace the pipeline? What medium to use?
If the pipeline cannot be reliably isolated from the production system, it must be blocked off using blind plates, or the connections such as valves must be removed directly. The entire pipeline to be welded should be cleaned with air, and then washed with water; the standard is to use a pH test strip to ensure that it is not acidic. Only after gas testing shows satisfactory results can welding proceed.
No purging is needed; once the materials are neatly placed, work can begin
Pour concentrated sulfuric acid again, and weld as soon as it’s added. Try not to use compressed air or water for cleaning, unless it has been completely disconnected; instead, wash it thoroughly with a large amount of water quickly