Traditional wire rope inspection techniques do not adequately establish the internal condition of a wire rope. For rotation resistant, multi-strand ropes, difficulties in assessing the internal condition is of particular concern. Degradation of the inner strands will affect the distribution of forces in the rope which significantly reduces the ultimate load bearing capacity and increases the torsional moments on the outer strands, reducing fatigue life.
In order to “look inside” a rope, equipment has been developed which allows the user to establish the condition of the wires and strands inside the rope without physically opening up the outer strands. TENSOLOGY state of the art equipment is capable of simultaneously detecting localised faults (LF) such as wire breaks and any loss in metallic area (LMA) caused by internal corrosion. The location of any LF’s or LMA is recorded by the equipment, allowing areas of concern to be closely monitored during future examinations.
Whilst often used to assess the condition of existing used ropes, MRT can also be carried out prior to a rope going into service. Results from the MRT of a newly manufactured rope can be stored and used as a reference for future examinations.
Magnetic Rope Testing (MRT) is an essential part of any rope examination but should not be considered in isolation. Various standards and codes provide rules and guidance for the inspection and examination of wire ropes such as ISO 4309 – Cranes – Wire Ropes - Care and Maintenance , Inspection and Discard. Local regulatory requirements should be considered prior to conducting any rope examination.
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