Dear Friends
Project - Conversion of Tanker Vesel into FPSO Platform
Material Group 1- ASTM A106-B x 6" x 21.95thk ( Process Piping )
Weld Process - GTAW / SMAW. Applicable Code-ASME B31.3
Upon completion of PWHT/Hardness Test , RT Done- It passed. Did not do MPI.
The purpose of MPI is to detect Surface/Sub-Surface Discontinuities which could be missed out by RT.
But here I'm working with Plain Carbon Steel.
Is it mandatory to do MPI?. Where I can find this requirement in ASME B31.3 or in any other ASME codes.
I'ne gone through Chapter VI, but found nothing about MPI Requirement
Appreciate prompt guidance and advise

Nalla, for your question you must refer to the COde of Construction, which is specified for the project or the item respectively.

DK