Reliability and Condition Monitoring Services
Ultrasonic Thickness testing is used to determine the remaining plate thickness and therefore the integrity of steel, aluminium and general metal vessels, plates and pipe work. Whilst the process is non destructive, physical contact with the surface is required. Advancements in technology have removed the need for surface preparation and reading can now be taken through a painted surface. The Ultrasonic Thickness Report is a separate detailed report and includes diagrams indicating where the readings were taken and the current state of the component. These reading can then be used for trending over time or compared against set standards to identify remaining life or wear rates within the system.
There are two methods of receiving the ultrasound waveform, reflection and attenuation. In reflection (or pulse-echo) mode, the transducer performs both the sending and the receiving of the pulsed waves as the "sound" is reflected back to the device. Reflected ultrasound comes from an interface, such as the back wall of the object or from an imperfection within the object. The diagnostic machine displays these results in the form of a signal with an amplitude representing the intensity of the reflection and the distance, representing the arrival time of the reflection. In attenuation (or through-transmission) mode, a transmitter sends ultrasound through one surface, and a separate receiver detects the amount that has reached it on another surface after traveling through the medium. Imperfections or other conditions in the space between the transmitter and receiver reduce the amount of sound transmitted, thus revealing their presence. Using the couplant increases the efficiency of the process by reducing the losses in the ultrasonic wave energy due to separation between the surfaces.