Monday, May 7, 2012

[MW:14200] API 650 - Vacuum box test Vs PT/MT(Penetrant Test/MPI)

Please provide technical support:-

What is the difference between Vacuum box test(for leak detection) and PT(for surface discontinuity detection)?

PT can detect all the surface discontinuity as well and MT can detect surface and slightly subsurface discontinuity also, but why API 650 prefers Vacuum box test instead of PT for Carbon steel-tank bottom plate welding?

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