Visual Examination (VT-1,2,3)

NWS personnel are qualified and trained to perform ASME Boiler & Pressure Vessel Code Section XI VT-1, VT-2 and VT-3 visual examinations.  These examinations are routinely performed in our facility while valves are being refurbished to meet customer in-service inspection (ISI) program requirements. Several NWS employees are qualified as Level II Inspectors.

Types of examinations include, but not limited to:

  • VT-1 of Pressure Retaining Bolting (bolts, studs, nuts, flange surfaces, bushings, and washers)

  • VT-2 leakage examinations of pressure retaining valve components

  • VT-3 of Valve Bodies - internal surfaces and components


Liquid Penetrant Testing (PT)

PT examinations are performed on a variety of valve components, including machined and welded items. 

Additional types of NDE examination methods can be subcontracted to an NWS approved 

supplier (10CFR50, Appendix B) as needed.

Nondestructive Examination Services