Dave Dickey Forum Moderator 309 Posts
Re: What are the required changes for re-rating a mixer?27 January 2011 at 1:29pm
Without current ASME Code books, I do not have a specific answer about the required changes for re-rating. However, 316ss should not be too brittle or weak at -80 degrees F. The vessel does need to be rechecked by an ASME Code shop and re-inspected by an ASME Code inspector, with a new nameplate reflecting the lower temperature for it to be insured and used at the lower temperature. Unless the vessel is a very marginal design or has been modified, most of the re-rating should be paperwork and inspection.
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Can a chemical mixer of 316ss rated at -40 degrees F be re-rated to -80 degrees F? The vessel walls are 1/2-in. thick.
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