Following an identical failure of another Zigzag, Petzl have issued a product recall for the Petzl Zigzag.
Following the Petzl statement on 15th April and having now had an opportunity to assess the Zigzag that failed in use, Petzl have released an urgent STOP USE notice. Users of the Petzl Zigzag are being asked to stop using the mechanical prussik immediately. Anyone with a ‘ZZ’ can either return the device to their supplier and ask for a refund or can keep hold of it until Petzl have tested methods they are developing to stop the karabiner from rotating and causing the canter-levering effect cause caused the catastrophic failure in Germany. For more information and the full Petzl Stop Use notice please click here.
Petzl have released the following statement on the Petzl Zigzag following the incident in Germany we tweeted about over the weekend.
Note from Abaris International: We would like reassure any Petzl customer that having been involved with Petzl for 12 years we know that they will indeed investigate fully and would not shy away from a decision to recall any device if they deemed it necessary, whatever the cost to them. Petzl take your safety very seriously.
Safety Information: Petzl ZIGZAG mechanical Prusik
April 15th 2013
On Friday, April 12, Petzl was informed of an accidental fall in a training center in Germany. The injured person was moving at height using a Petzl ZIGZAG mechanical Prusik. The first observations have shown that the fall was due to a failure of the rope-end attachment hole. After hospitalization, the injured person returned home on April 14. We are deeply concerned and we wish him a very quick recovery.
Current information regarding the accident (as of April 15):
As of today, Petzl has been able to gather the following information:
• Photos of the Petzl ZIGZAG and the rope-end attachment hole
• A preliminary telephone account by the injured person.
This information seems to indicate that:
• The upper carabiner may have been cantilevered and cross-loaded
• The injured person was descending while performing repeated, sudden stops while using the device in a training center.
Nevertheless, to have a clearer vision of the accident’s cause, Petzl is in contact with the injured person to obtain the following missing information and equipment as quickly as possible:
• A description of the complete system used by the injured person
• The ZIGZAG, the two connectors, the rope and any other devices that may have been used.
• The ZIGZAG is CE-certified PPE and designed to resist static loads greater than 15 kN.
• The side plates are constructed with the same materials and adhere to the same side plate requirements as similar products (ID, GRIGRI, RIG).
Use of connectors:
A carabiner should always be loaded on its major axis. If it is cross-loaded, side-loaded or loaded off axis, it can:
• Break under low loads (ex: gate breakage at 1 to 2 kN)
• Or, if cantilevered, it can transmit very high loads (4 to 5 times the applied load)
Sudden stopping during a descent could transmit dynamic loads up to 3 to 4 kN. The combination of both incorrectly loaded carabiners and sudden stops could generate dynamic forces greater than 15 kN and exceed the minimum breaking strength of the attachment points of the connected device.
Taking into account the information that we currently know of this incident, Petzl is now conducting a battery of tests to understand the precise causes of this accident. To date, our preliminary in-house tests do not show this potential failure even under high loads (cross-loaded, side-loaded or loaded off axis) of 10-15 kN. We are continuing different testing scenarios to try to understand the failure.
Follow-up action and recommendations
• Petzl takes this accident and the safety of its users very seriously. We will communicate the final results of our tests and our conclusions on our website by Tuesday, April 23, 2013.
• Until then, you can continue to use your ZIGZAG in accordance with the technical notice, ensuring that the attachment carabiners remain oriented on their major axes.
• As an additional measure of precaution, we recommend that you put in place a connector retaining solution that keeps the connectors oriented on their major axes.
We draw your attention to the following points, which are applicable to all metallic PPE:
• Inspect before use for the following:
– the absence of cracks or fissures
– the absence of product deformation.
• Verify during use that your carabiners are always correctly loaded on their major axis.
• Ensure the compatibility of all components in your system.