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CMC MPD vs Petzl I’D

Written By: Lance Piatt

CMC MPD vs Petzl I’D

In technical rescue operations, selecting the appropriate descent control device is crucial for efficiency and safety. Two prominent devices in this field are the CMC Multi-Purpose Device (MPD) and the Petzl I’D. This article provides a comparative analysis of their features, performance, and suitability for various rescue scenarios.

Overview of CMC MPD and Petzl I’D

CMC MPD: The MPD is an innovative device that combines multiple functions, including a high-efficiency pulley, a built-in rope-grabbing mechanism, and a variable friction descent control. This design allows seamless transition between lowering and raising operations without changing hardware.

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Petzl I’D: The I’D is a self-braking descender with an anti-panic function, widely used in rescue and rope access. It facilitates controlled descent and can serve as a belay device. However, it lacks an integrated pulley, which may affect mechanical advantage in certain setups.

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Comparative Analysis

The following table summarizes the key specifications and features of both devices:

Feature CMC MPD Petzl I’D
Functionality Descent control, belay device, pulley Descent control, belay device
Integrated Pulley Yes No
Mechanical Advantage High (up to 9:1 with “Inside 9” system) Lower due to lack of pulley
Rope Compatibility 11 mm (Technical Use), 13 mm (General Use) 10-11.5 mm
Maximum Breaking Strength 44 kN (Pulley), 20-23 kN (Descent Control) Not specified
Weight 1.2 kg 0.53 kg
Certifications UL Classified for pulley, descent control, and belay CE EN 341, NFPA 1983

Note: The “Inside 9” system refers to a mechanical advantage setup that achieves a 9:1 ratio, effectively utilizing the MPD’s integrated pulley.

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Performance in Rescue Scenarios

Mechanical Advantage: The CMC MPD’s integrated pulley enhances efficiency in raising systems, providing a significant mechanical advantage. In contrast, the Petzl I’D lacks this feature, potentially requiring additional equipment to achieve similar efficiency.

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Ease of Transition: The MPD allows for seamless transition between lowering and raising without changing hardware, streamlining operations. The I’D may necessitate additional steps or equipment for such transitions.

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Weight Consideration: The Petzl I’D is lighter (0.53 kg) compared to the CMC MPD (1.2 kg), which may be advantageous in scenarios where weight is a critical factor.

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Conclusion

Both the CMC MPD and Petzl I’D are reputable devices in the field of technical rescue. The choice between them should be based on specific operational needs:

  • CMC MPD: Ideal for scenarios requiring high mechanical advantage and seamless transition between lowering and raising operations.
  • Petzl I’D: Suitable for situations where a lighter device suffices, and additional mechanical advantage is not a primary concern.

Peace on your days…

Lance

 
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About The Author:

Picture of Lance Piatt

Lance Piatt

Beginning his career in the rescue and rigging world as a “blue collar” SAR member with Deschutes and Jefferson County teams. Lance Piatt owns and operates Red Ibex Solutions, a sales and marketing wheelhouse blending rope rigging education and exquisite imagery with equipment knowledge and understanding; housing Rigging Lab Academy and Rescue Response Gear… Lance is producing high-end video education, working with several experts and instructors to produce unique series of “how to videos” and courses for rope rigging: Such as; the first ever full-length rescue training DVD, 'Tower Rescue', released in fall of 2005. As well as a series of scenario-based rescues ranging from cave rescue to cliff rescue.

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