Rerating of SA-106B pipe for low temperature,

[MB2010]

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?

 

[metengr]

Yes, it is possible provided the current condition of the pipe is evaluated, and a FFS evaluation for the new design conditions is performed using ASME/API FFS-1.

 

[stanweld]

API 579 FFS is recommended. You will no doubt be required to perform some impact testing from samples removed from the pipe.

 

[MB2010]

Doesn't B31.3 apply to only new equipment/piping though?

 

[Duwe6]

Correct; ASME B31.3 is a design/construction Code only. However, API-570 for in-service pipe refers back to it a lot. The *Official* Code(s) would be listed as API-570, ASME/API-FFS-1, API 579, etc., but you will predominately be working out of B31.3.