I am looking for a document that gives clear guidlines on Hot Tapping, I have reviewed API RP 2201 but didn't find much details as to where/which services to allow for Hot Tap and whether it should be considered a permanent or temporary solution,
Could a piece of SA-106B pipe which has been in service for 10 years be rerated for another service with lower pressure and low temperature (-40°C) withought impact test using Fig 323.2.2B of B31.3 or API 579 should be used for this purpose?