Lesson 19: Pre-tension rope installation onto multi-layer drum

According to the ISO 4309, a pre-tension equivalent to at least 2.5 to 5% of the minimum breaking load should be applied. In particular, sufficientpre-tensioning of the rope on the drum must be given. Renew the pretension at regular intervals so that all rope layers can work together firmly as a “package”. The start and stop movements of the drum cause the rope layers to shift to the lower layers and become loose. If the pre-tension of the rope on the drum is too low, the individual layers become loose and the rope strands that run up under tensile stress can pull themselves into the loose drum layer. This causes the rope to be crushed and severely damaged.