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nde ndt asnt asnt basic level iii exam asnt level iii certifications asnt level 3 asnt level 2 asnt level ii certifications api asnt basic level iii asnt ut level ii asnt level ii exam api 570 piping inspector api 570 preparations exam asnt lt level iii nondestructive testing pt asnt pt level iii liquid penetrant testing asnt mfl level iii mfl magnetic flux leakage asnt nr level iii nr neutron radiography asnt ir level iii level iii ir thermal/infrared testing ae emission testing leak testing lpt asnt et level iii asnt mt level iii asnt ut level iii radiographic testing asnt rt level iii rt minimum distance weld api 653 api 575 tank inspection asnt mt level ii magnetic particle testing mt asnt pt level ii ut rtfi asnt radiographic film interpretation asnt level ii exam cwi certified welding inspector vt api sife source inspector fixed equipme api sife exam api sire source inspector rotating equi rotating equipme api sire exam sme viii div.1 sme viii welded joint category asme viii div.1 asme viii pressure vessel the pressure vessel certificat asme circumferential pipe joints visual testing