Non Intrusive Inspection (NII)

Definition - What does Non Intrusive Inspection (NII) mean?

Non intrusive inspection refers to the collection of examination methodologies used to check an object for the presence of corrosion (or other condition) that does not require opening, unearthing or otherwise exposing the object in the location where it is housed, installed or used.

Corrosionpedia explains Non Intrusive Inspection (NII)

Non intrusive inspection methods include digital x-ray, vibration monitoring, ultra-high frequency analysis and dynamic contact resistance measurements.

Key benefits of non-intrusive inspection procedures include:

  • Minimizing production losses that would otherwise require equipment shutdowns
  • Decreased labor costs associated with unearthing buried pipes and other structures for inspection
  • Reduced risks and hazards to inspection personnel because several non-intrusive inspection techniques can be performed remotely
  • No cleaning and emptying of metal vessels is required for the inspection
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