Abstract
Drilling rigs belong to the lowest-safety level of hoisting rope systems. The valid regulation for drilling permits the usage of steel ropes on condition that their permanent safety does not decrease under the value 2.5. Considerable dynamic and cyclic stresses, abrasion and corrosive environment generated during the operation cause rapid fatigue and rope damage. The stress of the rope in operation leads to the specific precautions ensuring the safety rope work. The specific precautions include monitoring of the rope tractive work measured in tonne-kilometres (ton-kilometres services). The working part of the hoisting ropes of the drilling rigs - after the stated number of tonne kilometres was worked off - is slipped and a regular non-destructive rope test (NDT) is recommended. Rope under sizing, failing in rope slipping program and non- implementation of NDT controls led to the situations endangering the drilling crew safety. After the critical situations the operator decided to perform the analysis of the condition of all ropes.
Highlights
Drilling rigs belong to the lowest-safety level of hoisting rope systems
The length of the rope service depends on the quality of the rope wires material, the rope construction and of the rope service conditions
The choice of the proper rope construction for the specific rope employment, knowledge of specific rope service conditions and wear mechanisms are fundamental for safety rope operation
Summary
Drilling rigs belong to the lowest-safety level of hoisting rope systems. The valid regulation for drilling permits the usage of steel ropes on condition that their permanent safety does not decrease under the value 2.5. Considerable dynamic and cyclic stresses, abrasion and corrosive environment generated during the operation cause rapid fatigue and rope damage. Considerable dynamic and cyclic stresses, abrasion, adhesion and corrosive environment generated during the operation cause rapid fatigue and rope damage. The stress of the rope in the operation leads to the specific precautions ensuring the safety rope work. The work conditions are the most specific and they depend on a place of operation (mines, elevators, cableways, hoisting system, drilling rigs). The choice of the proper rope construction for the specific rope employment, knowledge of specific rope service conditions and wear mechanisms are fundamental for safety rope operation. It is important to pay attention to two another factors affecting safety rope operations, rope maintenance and rope pulling system, the rope condition monitoring
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