How often
Visual inspection daily; thorough inspection monthly with a record. Slip and cut on the Wire Rope Industries ton-mile program, or sooner on the Rig Manager's call. Rig 4 target: 20 ton-miles per foot cut.
Source: API RP 54 (4th ed.) 7.5.1 and 7.5.7; API RP 9B; Nordic R4 Slip and Cut Drilling Line 3.0 and 6.0 step 3