MRT is a non destructive, magnetic and contactless procedure that allows us to detect broken wires, distortions and corrosion on steel wire ropes.
The Magnetic Rope Testing method was introduced in the cableways sector to inspect the haulage and carriage and to entify external and internal defects. In the 80s this technique broadened the offshore heavy lifting market due to the increasing needs in terms of efficiency and safety. ISO4309 includes MRT as an assessment method for the inspection of generic heavy lifting steel wire ropes.
Innovative concepts in the MRT, improving both magnetic development and user-interface facilitating a full wire rope inspection thanks to an automatic setting included in the software.
MRT devices are equipped with two different signals (on two separate electric circuits) that can be useful for the operator to identify and estimate damages such as internal and external broken wires, corrosion, wear, etc.
The LF signal is the main technique in this field and it is completely regulated by international standards. It consists in the measurement of the leakage flux that appears when a defective portion of rope is introduced into the device.