TML NDT Level 3 Services

NDT Level 3 Services

David Thomas

NDT Procedures / Techniques / Written Practices

NDT / NDE Experience:

25+ years as NDT Level 3 with extensive experience of British, European and US Codes, Standards and Specifications, including ASME Code requirements for U Stamp etc. Work carried out for all major industries including pressure vessels, nuclear, petro-chemical, foundry, off-shore, rail, power generation and aerospace.

NDT / NDE Qualifications / Certifications:

ASNT NDT Level 3 (No. 12933)
ACCP Professional Level 3 (No. 12933)
PCN (ISO 9712)
Level 3 (No. 103697)

Radiographic Testing
Radiographic Testing
(GI and PE)
Radiographic Testing
Ultrasonic Testing
Ultrasonic Testing
(GI and PE)
Ultrasonic Testing
Magnetic Testing
Magnetic Testing
(GI and PE)
Ultrasonic Testing
(Wrought Products)
Penetrant Testing
Penetrant Testing
(GI and PE)
Magnetic Testing (General)
Visual Testing
Visual and Optic
Testing (GI and PE)
Penetrant Testing (General)

Visual Testing


Contact email for David Thomas is


David Thomas worked as managing director, then director, at Applied Inspection Ltd. The company was sold in 2015, after which he continued with the company for a period on a consultancy basis. Before that he worked overseas in Brasil (Petrobras approved Level D Ultrasonic Testing; jacket and module construction for off-shore), Brunei (Level II UT of off-shore structures where he was also responsible for writing, developing and implementing a procedure for underwater UT weld examination of TYK joints, including training of divers), and Bordeaux, France (UT, MT, RT, PT, VT of modules for off-shore).

Before travelling overseas, he worked for Errington Laboratories (later bought by Bodycote/Exova) carrying out UT, RT, MT and PT on power plants (including nuclear), aerospace (Rolls-Royce), pressure vessel / engineering companies, fabrication, and construction, before being promoted to divisional manager.

He has undertaken independent Level 3 consultancy work for a wide range of organisations, the following are some examples.

Appointed ASNT NDT Level III to various companies, mainly in the UK, as per ASME BPV Code requirements (Code stamps U, U2, S, A and UM)
Preparation and/or review of NDT procedures (RT, PT, MT, UT, VT), Written Practices to SNT-TC-1A, review of Level 1 and 2 technicians qualifications and certification for compliance to ASME BPV Code and SNT-TC-1A, assistance in preparation for review/audit by ASME, and attendance at audits. Working in conjunction with client and ASME Authorised Inspectors (AI) from HSB, Lloyds Register, RSA and BV.

Fluor Corporation - Multinational Engineering and Construction Firm headquartered in Irving, Texas
UK and on-site on Changxin Island, Shanghai, China - contracted as independent QA and NDT Level 3 consultant to investigate why transverse cracks had not been detected in welds during the fabrication phase of monopiles and transition pieces for large offshore wind farm project in UK.

Wartsila - Global Leader in Marine and Energy headquartered in Helsinki, Finland
On-site at Astano Shipyard, Ferrol, Spain - contracted as independent NDT Level 3 consultant to review and evaluate over 2000 radiographs of high pressure pipework welds in dispute between client and sub-contractor / Lloyds Register.

Britannia Operator Ltd for ConocoPhillips, Major Oil and Gas Organisation
On-site at foundry in Northern Italy - contracted to review and evaluate sub-contractors proposal for the Ultrasonic examination of valve bodies made from cast Duplex for the Britannia field, North Sea.

Brush Electrical Machines Ltd., UK Manufacturer of Large Generators for Gas and Steam Turbines
UK assignment - appointment as ASNT NDT Level III certified consultant for Channel Tunnel Shuttle Train project to advise on specialist NDT requirements.

SGS Qualitest at Ponticelli Freres, Bordeaux, France
On-site in Bordeaux - compilation of NDT and inspection procedures, UT, RT (x & gamma), MT, PT, VT, Dimensional and Weld Inspection, for Pickerill Field Development, North Sea.

Special Melted Products Ltd., Sheffield, UK - Major UK Forging Organisation
Contracted on-site in Sheffield, UK for SGS UK/Japan - independent witness, inspection and documentation review of aero engine turbine discs. UT immersion testing, mechanical testing and acid etch testing.


Doctor of Philosophy Degree
Master of Science Degree
Post Graduate Diploma
Higher National Diploma

Chartered Radiological Protection Professional (CRadP)
Chartered Quality Professional (CQP)


Member British Institute of NDT (MInstNDT)
Member American Society for NDT
Member Chartered Quality Institute (MCQI)
Member Society for Radiological Protection (MSRP)


ASNT North Atlantic Section
Chairman - 1995-6
British Institute of Non-destructive Testing, East Midlands Branch
Chairman - 1998-9

If you have a need for the preparation, review or update of NDT / NDE procedures or techniques, or any other NDT / NDE Level 3 requirement, please email

NDT Resources:

What is NDT? | Ishihara Colour Test | Shades of Grey