Nondestructive testing of large diameter steel （无损检测大直径钢）.pdf

Non-destructive testing of large diameter steel wire ropes with Intros instruments Slesarev D., Vorontsov A. INTRON PLUS, Russia Magnetic non-destructive testing has become a standard method of condition monitoring at many different rope applications, such as ropeways, lifting ropes, cable- stayed structures [1]. This is reflected in modern industrial regulations and codes, for example, BS EN 12927-2004, ISO 4309:2010 and other. This technique was most widely applied for ropes of diameter up to 60 mm, because these ropes are mostly applied. Last time magnetic testing finds more often use for inspection of large diameter ropes, these ropes are from 60 mm to 120 mm and more. It concerns both ropes of lifting machines and ropes of cable-stayed structures. This technique also is being applied for off-shore applications by several companies, including Acergy Group. Main object of non-destructive rope testing consists in measurement of loss of metalic area (LMA) and detection of local faults (LF). LMA indicates suc h faults as corrosion and abrasion. LF are caused typically by wire breaks, both outer and internal. All this rope faults lead to the loss of rope’s load-carrying capacity. While calculating wire rope residual load capacity one should take into consideration both deterioration factors – LMA and LF in their distribution over rope’s length. Figure 1 shows distribution of LMA and LF for one shaft lifting rope of 63 mm diameter during 3 consecutive inspections (blue – first inspection, orange – second inspection, red – third inspection), carried out with help of Intros instrument. Combination of distributed LMA and local wire breaks is to be seen on these diagrams. Effect of LF superposes over LMA and residual load capacity ca