NDE requirements for valve by-passes

[MoReSo]

Hello,

What is the NDE requirements for by-passes welds on cast valves per ASME or API? Do codes require MPI on bypass welds or it is just an industry practice?

thank you,

MRSohrabi;
Material and Welding Eng.

 

[racookpe1978]

Why would you think that these NDE requirements would be any less?

 

[MoReSo]

As ASME B16.34 just talk about body and bonnet NDE and doesn't mention any thing about bypasses.
I want to know that the requirements can be apoed for bypasses?

MRSohrabi;
Materials and Welding Eng.

 

[wegm]

MSOHRABI,
API 6D doesn't require obligatory NDTs. Instead, if your client requires NDTs then you shall perform them as specified in Annex A of API 6D. For example if MT on welds is specified by the customer, you shall perform it as specified in clause A.13 of Annex A. Please have a look at this link:NDTs on Ball Valve as per API 6D
regards,
wegm

 

[racookpe1978]

That's what we are trying to get you to understand: How can there be any difference in NDE on a valve exposed to the same pressure and temperature as the main-line valve?

Do you think a bypass valve somehow sees less energy than the main-line valve it is next to?

 

[Ripz]

Valve Bypass Piping are subjected to the same NDE Requirements are your valve's main piping.

 

[jbeckhou]

API-6A? PSL?

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