Tensioning a rope for a Tyrolean
The I'D may be used as a progress capture device to tension a rope. It allows the rope to be tensioned without damaging it in case of overloading, and releases easily.
- Carefully read the Instructions for Use used in this technical advice before consulting the advice itself. You must have already read and understood the information in the Instructions for Use to be able to understand this supplementary information.
- Mastering these techniques requires specific training. Work with a professional to confirm your ability to perform these techniques safely and independently before attempting them unsupervised.
- We provide examples of techniques related to your activity. There may be others that we do not describe here.
The system is designed for light loads: one or two people depending on the application and the situation.
Warning: the installation presented here is only part of a system. A complete system must include (depending on the terrain) at least one additional rescue or backup rope.
Tensioning the tyrolean:
I'D handle in "belay" mode.
Simple haul: two people pulling.
Using the tyrolean:
I'D handle in "work positioning" mode.
Mule knot in the free end of the rope at least 1 m from the I'D.
An brief overload can cause the rope in the I'D to slip (up to 80 cm). This slippage helps reduce the impact force and must not be hindered by the knot.
The knot limits rope slippage through the I'D in case of a prolonged overload.
Releasing the system:
To lower the user during the traverse, place a braking carabiner at the I'D anchor point. Use the handle in "descent" mode while gripping the brake side of the rope to control the speed of descent.
Dismantling the system:
If the tension is too high, using the handle can be difficult; re-installation of the haul system may be required.
Loads on the anchors:
Manual hauling on a 10.5 mm rope can produce a tension of 3.5 kN before the system is loaded. An initial tension that is too high reduces sag, but increases strain on the anchors.
Rope slippage in the I'D also reduces the risk of overloading the anchors: see the "Additional information" section for static slippage values.
A rope tyrolean will sag once it is loaded. Make sure there is enough clearance under the rope to allow the load to move without striking the ground or an obstacle.
WARNING: never tension a rope with a winch or a vehicle: an over-tensioned tyrolean can damage the I'D and generate significant forces on the anchors and on the rope. If you need high tension, use a cable with an appropriate tensioning system.