Ultrasonic thickness measurement

Ultrasonic thickness measurements

Ultrasonic thickness measurements are often necessary to determine the wall thickness of metallic assets in order to:

  • Determine if there has been any section loss or damage during service
  • Identify variation across elements
  • Confirm the accuracy of fabrication drawings

Wall thickness can be a safety critical factor in road furniture such as parapets, vehicle restraint systems, and lamp posts. Wall thickness can also be of structural importance where metal elements form part of a larger structure, for example in ‘I’ beams and steel frames.

Although thicknesses can often be determined by direct measurement (drilling holes), it is often preferable to use techniques which avoid physical damage. Benefits of ultrasonic techniques:

  • Access is only required to one side of the element to be tested
  • Provides an assessment of any flaws that may be present
  • Highly accurate results (+/- 0.1mm)
  • Can take into account the presence and thickness of surface coatings

Nicholls Colton can undertake Ultrasonic thickness measurements using calibrated pulse-echo ultrasonic thickness gauges. Detailed results are provided along with a commentary regarding the condition of the surface tested, noting features such as corrosion which may influence the result.