Production • Processing • Handling
Selecting the right steel rope is crucial for success
Günther H Gfrerrer provides fundamental information on the use of special steel wire ropes in multi-layer winding configurations.
N
o matter whether you are faced with choosing a rope for a new project or intend to replace an existing rope, selecting the right rope type is crucial as to whether the rope will meet the
desired requirements or not. Generally, we distinguish between rotation-
resistant ropes (Teufelberger TK Series) and non rotation resistance ropes (Teufelberger Q Series). Which rope is the right one for a new project depends on the specific application. Do not hesitate to contact Teufelberger for help with picking the right type of rope. For existing installations, it will be helpful
to start by taking a look at the crane log which contains the most important data concerning the rope (diameter, minimum breaking force, etc). Apart from what is described in the crane log, when using the rope in a multi-layer winding configuration, customer satisfaction can be enhanced considerably by replacing regular lay ropes with langs lay ropes. As compared with regular lay ropes, langs lay
ropes offer greater flexibility and thus a superior ease of winding. Furthermore, langs lay ropes provide greater
wear resistance due to the bigger area of contact between the various wires. Tis gives them a longer service life vis-à-vis regular lay ropes.
Exercising caution Exercise caution when using langs lay ropes on systems with heave compensation, as the greatest stresses occur not in the region of the drum, but in the region of the heave compensation. Terefore, repeated NDT inspections are necessary when using langs lay ropes. Generally, the following rule of thumb applies
to single-layer winding configurations: for a right- handed drum pitch a left-handed rope is required, and vice versa. Several years of experience and countless examples
have shown that with replacement ropes changing the rope’s lay direction from right to left or from left to right will considerably improve their life span.
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In the case of flat drums, it must be ensured that the gap between the flange and the rope is not greater than 0.5 times the actual rope diameter, as otherwise the rope will be cutting into the layer located underneath (Fig. 1). Tis causes severe winding problems and may even lead to the rope being
Fig. 1. Rope cutting in.
Before carrying out such changes, we recommend that you contact the supplier/manufacturer of the replacement rope. In multi-layer winding configurations, and when using non-rotating ropes, the drum pitch is of secondary importance.
Installing the rope Te life of a steel wire rope depends to a large extent on how the rope is installed. Pulling the rope on under load as opposed to pulling the rope on manually and in an unloaded state helps avoid damage to the rope and reduces winding problems in ongoing operations which occur due to the gap between the various 360 degree turns.
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