Inspection & Testing

TRAC is accredited in accordance with UKAS BS EN ISO/IEC 17020:2012.

TRAC provides a comprehensive range of inspection and non-destructive testing services for materials and structures across all industry sectors.

We offer integrated packages to suit specific requirements including full project management and technical capability, conventional base and site services, and a range of specialist and advanced methods that utilise new and developing technology.

Specialist InspectionRemote InspectionNon-Intrusive Inspection

Conventional NDT services

  • Magnetic Particle Inspection
  • Dye Penetrant Inspection
  • Ultrasonic Testing
  • Eddy Current Inspection
  • Radiography
  • Visual Inspection

Magnetic Particle Inspection (MPI)

Magnetic Particle Inspection (MPI) is used for detecting surface and near surface discontinuities in ferromagnetic materials.

When a magnetic field is induced into the material by using an electromagnet, the presence of a surface breaking defect will create a leakage field.

This leakage field is made visible to the human eye by use of finely divided ferromagnetic particles which are attracted to the leakage field thus giving a visible indication of discontinues, their size, location and shape.

Dye Penetrant Inspection (DPI) / Penetrant Testing (PT)

Penetrant testing is used for detecting surface breaking discontinuities in Ferromagnetic and non-Ferromagnetic materials.

Penetrants are brightly coloured dyes that are applied to the surface of the test material and given time (Dwell time) to enter into any defects. Penetrant testing can be used on any non-porous material.

On completion of the Dwell period a highly absorbent developer is lightly sprayed onto the test area, drawing out dye from any discontinuity. The developer offers a contrast to the colour of the dye making interpretation of any defects highly visible. Alternative Penetrant methods include Fluorescent PT for use on carefully machined surfaces.

Ultrasonic Inspection (UT)

Ultrasonic Testing is the technique that measures the time for high frequency pulses of sound waves to travel through the inspection material, the frequencies are usually 0.1 – 15MHz but occasionally up to 50MHz. If a discontinuity is present, the sound wave will return to the probe in a shorter time than expected from a fault free specimen.

Eddy Current Inspection (ECI)

Eddy current testing is the technique where electrical currents are induced in to the material being inspected and observing the interaction between the currents and the material. Eddy currents are generated by coils in the probe and is monitored simultaneously by measuring the change in impedance in the coils. As eddy current is an electromagnetic induction process, direct contact with the material is not required, however, the material must be an electrical conductor.

Other inspection techniques we offer are:

Radiography (RAD)

Radiography uses penetrating radiation that is directed towards a component.

The component stops some of the radiation. The amount that is stopped or absorbed is affected by material density and thickness differences.

These differences in “absorption” can be recorded on film, or electronically.

Visual Inspection (VIS)

Comprehensive offshore specific courses are offered in-house to meet our client’s contractual requirements, including Coatings & Insulation Inspection.

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