CORROSION CONTROL


FEATURE SPONSOR


CORROSION INSPECTIONS OF TURBINE TOWERS


Corrosion is one of the most critical sources of damage to the tower of a wind turbine The extent of the damage is often


invisible from the outside. Ultrasonic technology is a fast, portable solution that allows an inspector to view the scale of corrosion damage in great detail. It allows detailed, reliable reporting of the state and the safety of wind turbines.


MONITORING


During the lifetime of a wind turbine, corrosion monitoring is an important part of the inspection requirements. Corrosion inspections must be carried out with high accuracy to comply with industrial standards relating to nondestructive testing. When inspecting large structures such as turbine towers, techniques that are both precise and fast are preferred; one of the most commonly used techniques is ultrasonic inspection.


ECHOES


In ultrasonic inspection, a beam generated by a piezoelectric element travels from a probe to the structure being inspected. When the beam encounters corrosion, echoes are generated, which can be detected to locate the source of the corrosion (figure 1). There are two ways of detecting these echoes: with one transducer for both transmitting and receiving (pulse- echo configuration), or using separate transducers (pitch-catch configuration).


4 www.windenergynetwork.co.uk


Figure 2: Compact, lightweight flaw detectors facilitate


rope-access scanning.


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