I am re-rating an exchanger that was fabricated in 1965 and I am trying to find the stress allowables for the following materials. Would anyone be able to help me with this?
Go get a book "Process Equipment Design" by Brownell and Young. It has the very old code included and allowable stresses of those old firebox materails are there. so no guessing.
Carefully google or using Amazon.com or ebay you can see the entire content of the book, but not allowed to print. However, you will find the allowable stress in the middle of the book. If lucky, you can still buy one for less than $20.
Although allowable stress may be the same there are significant differences between new and old specs: in particular. toughness and flaw inspection.Other new spec would be redundant. I would be interested in what a OSHA inspector says when he sees your "rerated" stamp.