For a single rope, the standard stipulates that the fall coefficient to prevent an object weighing 80KG is 2 (the temperature note: the fall coefficient sees later) during the fall process cannot exceed 12 kN. For the double rope, it is no more than 8 kN in preventing a fall with a 55KG factor of 2. After many times of impact and use, the impact force of the rope will increase. The lower the impact of the rope you choose, the longer it can be used.
The inner diameter of a single knot that bears 10KG tension must be less than 1.1 times the rope diameter. The smaller the number, the more flexible the rope.
Number of falls
To meet the standard, the rope must be able to withstand 5 consecutive falls with a coefficient of 2. The number of available falls decreases with the time the rope is used, so the more the number of falls, the longer the rope can be used. Note: The number of drops of double rope and single rope is not comparable, because the weight of the falling body is different when they are tested.
The sheath is wrapped around the rope core, which is the visible part of the rope. It is braided by many strands of monofilament, and each strand is wound on a spindle. For the same diameter, the more spindles, the better the dynamic of the sheath, and the fewer spindles, the more wear-resistant it is. Therefore, one person chooses a single rope with 48 spindles (Top Gun) for better power performance or a single rope with 32 spindles (Wall Master III) for more wear resistance.
Under the pulling force of 80KG, the single rope cannot exceed 8%, and the double rope cannot exceed 10%. It is this elasticity that allows the rope to absorb the energy of a fall. The extension cannot be too large, otherwise it will become a bungee rope.
Diameter and weight
Ropes with larger diameters generally have a longer usable life, but they are also heavier and more difficult to use. On lines where weight and ease of use are important, it is best to choose a thinner rope. The overall performance of the rope should be considered as a balance between weight and dynamic performance. Suggestion: The measurement of size is not as accurate as weight, so it is better to compare the weight of the rope instead of the size.
The sheath and the wire core are two independent parts. If their structure is not well matched, there will be a relative sliding trend, and the sheath will begin to deform. Under the continuous friction of the descender, a loose section and Bulging, the pipe sleeve effect occurred. This phenomenon leads to faster wear and tear, especially when it is protected or used severely above, it also leads to the danger of the rope blocking the descender or protective device. Note: This is the only indicator that the European standard (EuroNorm) requires differently from the UIAA (UIAA). European standards stipulate that after a 2m rope is pulled on a specific device, the slip of the sheath is less than 40mm or 2%, while UIAA is more stringent, requiring less than 20mm or 1%