scope:

This Standard establishes general principles for the care and maintenance, inspection and discard of steel wire ropes used on cranes specified in JIS B 0146-1 (hereafter referred to as ropes).

In addition to guidance on care, maintenance and inspection, this Standard provides discard criteria for those running ropes which are subjected to multi-layer spooling, where both field experience and testing demonstrate that deterioration is significantly greater at the crossover zones on the drum than at any other section of rope in the system.

It also provides more realistic discard criteria covering decreases in rope diameter and corrosion, and gives a method for assessing the combined effect of deterioration at any position in the rope.

This Standard is applicable to those ropes used on hoists and hoist blocks.

NOTE 1 In view of the fact that when using synthetic sheaves or metal sheaves incorporating synthetic linings, wire breaks may occur internally in large numbers before there is any visible evidence of any wire breaks or signs of substantial wear on the rope, use of discard criteria for this case is not recommended.

NOTE 2 The International Standard corresponding to this Standard and the symbol of degree of correspondence are as follows.

ISO 4309:2017 Cranes-Wire ropes-Care and maintenance, inspection and discard (MOD)

In addition, symbols which denote the degree of correspondence in the contents between the relevant International Standards and JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) according to ISO/IEC Guide 21-1.