I've been trying to find a standard reference (ASME,AWS) that requires a UT inspection 24 hrs after welding carried out on process piplelines. I just cannot remember which standard it was mentioned in? I would appreciate your help in this regard.
I have searched ASME AWS and API, I cannot find where it sates in any of these codes that UT has to be completed in 24hours after welding has been completed, could have been a clients specification that you read to come up with this statement, do you remember who the client was ?
I know it is not an American code, but EN1011-2 "Recommendations for welding of metallic materials - Part 2: arc welding of ferritic steels" states in section 18:
"Due to the risk of delayed cracking, a period of 16h is generally required before final inspection"
Don't worry about non-American standards, there is a world outside! Here's a British one: BS 4515-1 for welding of carbon steel pipelines demands that the qualification test weld be inspected 24 hours after completion unless otherwise stipulated