Non-destructive testing makes it possible to detect cracks or porosity, bulk defects in a mechanical part, without altering it.

NDT can be carried out during manufacturing, renovation or on-site condition checks carried out at regular intervals. Facility owners can use this to plan the necessary corrective measures for their installations.
This service also makes it possible to verify a welding job or to approve the quality of a raw material before it is machined.


There are several types of non-destructive testing. Our certified experts carry these out themselves:

  • Visual testing (VT), which can provide essential information on the external condition of a part by detecting obvious defects such as wear, corrosion or open cracks.
  • Penetrant testing (PT), which consists of applying a coloured (red) liquid penetrant to the surface, which enters the part's pores. After removing the excess penetrant, a developer is applied to cause the remaining liquid in the pores and cracks to resurface through capillary action. This method reveals defects measuring 1 µm in width, 100 times finer than a strand of hair.
  • Magnetic particle testing (MT), which makes detection of superficial or even slightly more underlying defects possible by applying a magnetic developer and magnetising the metal part to saturation. This process only applies to ferromagnetic materials: steels (except austenitic steels), cast iron, nickel, and cobalt.

On request, we can also carry out ultrasonic (UT) or radiographic (RT) testing to detect internal defects.

    Client benefits

    Non-destructive testing provides a precise analysis of a mechanical part's condition, its state of wear, and its capacity to remain in operation. It makes it possible for hydroelectric facility owners to plan maintenance work on their installations.

    HYDRO Exploitation SA
    Rue de l’Industrie 10
    CP 750 - CH-1951 Sion
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    HYDRO Exploitation SA
    Rue de l’Industrie 10 CP 750 - CH-1951 Sion +41 (0)27 328 44 11
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