Re: [MW:14211] API 650 - Vacuum box test Vs PT/MT(Penetrant Test/MPI)

Gentleman,

It is my understanding with the code API 650 prefers for the Vaccum box test specially where there is no accessible to other side like tank bottom plate, any linear indication reveal by the PT or MT may subject to re-verification by other method like RT for further assessment to ensure the severity of flaws in such condition where there is no access to perform the RT for further assessment, Hence the Vaccum box test method is best method to identify the any possible leakage on the welded area of tank bottom plate.  

 

Warm Regards'

Rafeeq Ur Rahman

From: M S <striarc@gmail.com>
To: materials-welding@googlegroups.com
Sent: Monday, 7 May 2012 1:51 PM
Subject: [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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