SPECIFIC ASPECTS OF INSPECTION OF LARGE DIAMETER STEEL ROPES

Summary

Problem of nondestructive inspection of large diameter steel ropes is especially important in offshore applications, where costs of potential loss are very high. In this aspect it is important, based on computational simulations, to find optimal magnetization conditions for LMA measurement and detection of internal and external local faults in multi-strand rope. Besides that, it is essential for such ropes, to enable detection of wire break clusters. For MRT instruments it is also important to realize not only one but two LF-channels with different spatial resolution. From near LF channels additional information about wire breaks can be obtained from the local LMA behavior, upon condition that LMA measurement meets some rigid requirements. Nevertheless, not all the cases can be identified by MRT so that additional visual inspection and result verification is necessary to solve such doubtful cases.

Key words: magnetic rope testing, wire ropes, MFL

Author(s): D. Slesarev, K. Myakushev and I. Shpakov