Lowering 150 kg - 250 kg with the I'D S on the anchor - Petzl USA
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Lowering 150 kg - 250 kg with the I'D S on the anchor

Above 150 kg, descent control becomes very difficult. It is recommended to take technical measures to improve braking.

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.

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:

  • Use of a rope greater than 10.5 mm in diameter.
  • Two-person operation.
  • Munter hitch on the braking carabiner.

In the most critical situations, it is necessary to use all three techniques combined.

250 kg mass hanging freely with no directional point:

Techniques to improve braking:
Techniques to improve braking:
 

In less critical situations, too much friction can be a handicap. Thus it is recommended to use only two of the braking improvement techniques.

250 kg mass with a directional point:

The directional point provides additional braking.

250 kg mass with a directional point.
250 kg mass with a directional point.
 

Mass greater than 150 kg hanging freely with no directional point:

A mass of less than 200 kg requires less braking force.

Mass greater than 150 kg hanging freely with no directional point:
Mass greater than 150 kg hanging freely with no directional point: