Rediogry Testing (RT) in Piping

First- The Applicable Piping Code

Second- The QA/QC Department

Follow the most stringent of 1) applicable piping codes, 2) contract documents, and 3) internal QA/QC.

Editorial note: Radiography.

Thank you for your reply

But I have one more query that RT % is based on Joint efficiency. & How QA/QC dept. will define joint efficiency.

Please explain in details.

QA/QC is not there to define the joint efficiency. It is there to make sure there is evidence gathered that the applicable code/applicable specification has been followed.

Agreed sir

but My question is still open means how quality people will decide how much percentage of Radiography testing ( RT % ) to be done in piping

Please elaborate.

See #4↑. QA/QC isn't there to do that either.

In the U.S. boiler and pressure vessel code, you may claim 70% weld efficiency if no RT is conducted, 85% if spot RT, and 100% if full RT. Unless the RT is required, the decision is an economic choice.

Thank you for your answer.

Please explain how to calculate Joint efficiency? or on which basis joint effieciency will be calculated?

It isn't calculated; it is simply prescribed based on what portion of RT is done; as explained in the earlier post.