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Third Party Inspection

TWI provides third party inspection services delivered by experts from multiple industry sectors with experience of using the complete range of non-destructive testing (NDT) inspection techniques.

When critical structures are being inspected as part of an engineering project, our engineers are able to oversee the work and impartially provide additional assurance that any inspections taking place are sufficiently rigorous and following best practice.

With a history of more than 60 years’ advancement and leadership in developing NDT technologies and procedures, TWI is uniquely placed to provide peace of mind through its third party inspection services.


TWI provides highly experienced and qualified personnel to undertake third party oversight in all NDT inspection areas. The depth of experience in our team ranges from oil and gas exploration to the aerospace sector, with qualifications up to ISO 9712 NDT Level 3 and ASNT NDT Level III in the full range of methods.

Third party inspection services include:

  • Auditing of inspection facilities
  • Validation of inspection processes and personnel
  • Witnessing of inspection processes


Among the NDT methods covered by TWI’s knowledge and experience are magnetic particle testing, eddy current testingtime of flight diffraction and phased array ultrasonics.

For more information, visit our Innovative inspections and NDT qualifications and validation pages, or email

For more information please email: