David Thomas

David Thomas PhD

NDT Procedures, Techniques, Recertification, PCN, ASME ('U' Stamp) etc.


Thank you for visiting the NDT Level 3 Services website. I have 25+ years experience as an NDT Level 3 in petro-chemical, pressure vessel, piping, nuclear, engineering and construction industries, including ASME Code requirements for 'U' Stamp, 'S' Stamp etc. Based in Derby, England, I am able to provide NDT Level 3 services worldwide in RT, UT, MT, PT and VT.

Oil Refinery


If you require ongoing NDT Level 3 services, but only intermittently, you can appoint me as your NDT Level 3 on a fixed monthly or annual retainer fee, please feel free to contact me with details of your requirements. Typically your costs will be considerably lower than employing a full time NDT Level 3, often less than one month of a full time NDT Level 3's salary.

Also, if you require a smaller one-off job, e.g. NDT procedure or technique writing, reviewing or approving, again, please feel free to contact and discuss. Alternatively, as your NDT Level 3 for the longer term, such as for the ASME Boiler and Pressure Vessel Certification Program, this option is also available. Please see examples of my recent work on the Profile page.

Geographical Areas Covered

Worldwide, including USA, Canada, Europe, Australia, New Zealand, Africa, Middle East, South America.

World Map

NDT / NDE Experience

Experience of British (BS), European (EN), ISO and US Codes, Standards and Specifications, including ASME, ASTM, ANSI, API, AWS, Norsok, FMC and GE. Work carried out for all major industries including pressure vessels, piping, nuclear, petro-chemical, foundry, off-shore and power generation.

I have carried out quality and NDT Level 3 work in UK, China, Holland, Norway, France, Italy, Spain and Portugal, and I have lived and worked doing NDT in Brasil, France and Brunei.

In recent years I have been able to carry out NDT Level III work for a range of clients in countries around the world via email. It is an efficient and value for money service. Typical work involves writing, reviewing, amending, and Level 3 approving NDT procedures, techniques etc. To get in touch please go to the Contact page.