increase the radiographic test percentage

Do you have a 25% failure rate? That's enough for me to shoot every joint, specifications not withstanding.

Also; you might want to look a the answers to your previous question

dear,

thanks ,

but is there any acceptance ratio for the defects pecentage

like 5% dfects ratio from the total number of the tested joints in pipe line or pipe net, acceptable or not that mean i will not test more joints and is there any code specify that ratio

regards

I'm not an ISO 900X guy, but I know that your sample size increases with increase in failures (nonconformances). There are many Statistical Process Control (SPC) sampling systems base on Military Specs. that can be found on the internet. If you google Statistical Process Control you should find a schedule the will give you the level of quality you desire.

However: the Nondestructive Testing (NDT) requirements that are specified by ASME are for each weld type based on service temperature and pressure. There is no relief from these NDT requirements because you haven't had any failures. I'm basing this on previous experience/knowledge of the codes. Things may have changed in 10 years.

for piping, in one joint if any defect found, that to be repaired and additional two number radiography to be done.

for tanks All T-joints should be radiographed