Hi,
With PT you can find surface discontinuities and Imperfections and MT you can find Subsurface imperfections/Discontinuities also. But Code given some tolerance for the acceptance criteria in these method.
While you do with Vacuum box test you can find Pinholes and small cracks and code doesn't allow any small defect for bottom plate lap welding.
Thanks & Regards,
(Karthik)
Karthikeyan.S
QA/QC Manager
German-Thai Boiler Engineering Cooperation Limited.
Rayong Factory ;
379 Moo.6 Soi 8, Tambol Pananikom,
Nikompattana, Rayong 21180 THAILAND
Tel : +66 38 897 035-9 Ext. 137
Fax : +66 38 897 034
Hand Phone: 0066 892512282
From: M S <striarc@gmail.com>
To: materials-welding@googlegroups.com
Sent: Monday, May 7, 2012 5:51 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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