Lowering 150 kg - 280 kg with the I’D L on the anchor - Petzl United Kingdom
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Lowering 150 kg - 280 kg with the I’D L on the anchor

When the load exceeds 150 kg, descent control becomes very difficult. Braking improvement techniques are recommended.

Warnings

  • Read the technical notice before viewing the following techniques.
  • It is important to fully understand the information provided in the technical notice before using this complementary information
  • Mastering these techniques requires training.
  • Consult a professional before attempting to perform these techniques on your own.

Reminder of factors affecting the difficulty of a descent:

  • Increased load.
  • Wear state of the I’D used.
  • Diameter and condition of the rope used (new ropes tend to be slippery).
  • High rate of descent
  • Friction in the system: if the rope path passes through directional points, there is more friction than if the mass is directly suspended.

Techniques to improve braking:

  • Using a rope greater than 12.5 mm in diameter.
  • Using a Munter hitch with a directional carabiner on the anchor.
  • Two-person operation (only on pre-2019 I’D)

For a mass of up to 280 kg hanging freely with no directional point:

Braking improvement for a mass of up to 280 kg hanging freely with no directional point 1/2.
Braking improvement for a mass of up to 280 kg hanging freely with no directional point 1/2.
Braking improvement for a mass of up to 272 kg hanging freely with no directional point 2/2.
Braking improvement for a mass of up to 272 kg hanging freely with no directional point 2/2.

For a mass of up to 280 kg with a directional point:

Braking improvement for a mass of up to 280 kg with a directional point.

A directional point can increase friction in the system, helping control descent.

Any lowering of a load exceeding 150 kg must begin with the use of all the braking improvement techniques. During the descent, if there is too much friction, (light load, friction on a directional anchor, a swollen or dirty rope that does not slide properly...), the operator may decide to undo the Munter hitch, the rope that always passes from the directional carabiner to the anchor.

Warning: in this case, at the slightest sign of uncontrolled acceleration, stopping the descent and retying the Munter hitch are recommended.