Ultrasonic Thickness Measurement in Brazil

What it is

Thickness measurement is the most common application of ultrasonic testing. Its main advantage is that it does not require access to the opposite wall: measurements are taken from one side of the plate or pipe.

This makes it possible to monitor equipment wear without interrupting operations, which is essential for assets that run for years without shutdown. The technique is mainly used to detect wall loss due to corrosion.

How the test works

MappingMeasurement points or grid are defined according to the equipment and its history.
CalibrationThe gauge is set up for the material using blocks of known thickness.
MeasurementThe probe is coupled to the surface and the instrument calculates thickness from the sound's round-trip time.
ComparisonValues are compared with the nominal and minimum allowable thickness.
ReportThickness map with critical points highlighted, the basis for tracking the corrosion rate.

Where we apply it

Ship hulls and structures
Storage tanks
Piping and pressure vessels
Offshore and industrial structures

What it detects

Wall loss due to corrosion
Erosion wear
Internal corrosion with no visual access

Advantages

Access from one side only
Equipment can keep running
Fast, with immediate results
Historical data supports maintenance and replacement planning

Limitations and precautions

The surface must allow good coupling
Highly curved or irregular surfaces need extra care
Measures at the point; a well-planned grid is essential

Frequently asked questions

Do we need to shut down the equipment?

Usually not. Since the measurement is taken from one side, the equipment can keep running, subject to safety and temperature conditions.

How often should thickness be measured?

It depends on the corrosion rate, the type of equipment and the applicable standards or regulations. Measurement history helps define the ideal interval.