What percentage loss of diameter due to corrosion indicates a reason for removal of rope from service?

• A. 5%
• B. 10%
• C. 15%
• D. 20%

Answer: (B)

The appropriate percentage loss of diameter due to corrosion that indicates a rope should be removed from service is 10%. This threshold is based on safety and performance standards for ropes used in various applications, particularly in the field of line work.

When corrosion occurs, it diminishes the rope's integrity and strength, and a loss of 10% is significant enough to raise safety concerns. At this level of loss, the structural integrity of the rope could be compromised, leading to potential failure during operation. Maintaining a safety margin is crucial in the field of line construction, and adhering to this percentage ensures that workers are not exposed to unnecessary risks due to equipment failure.

The other given percentages either represent less severe corrosion that may not warrant immediate removal or are excessively cautious thresholds that are not standard practice in the industry.