According to ASME B30.23, which of the following shall not be used for suspension systems?

• A. Synthetic web bridle
• B. Chain sling
• C. Wire rope sling
• D. Alloy steel chain sling

Answer: (D)

Suspension systems require slings that can handle dynamic loads and routing over pulleys without snagging or failing. Alloy steel chain slings are not permitted for suspended work because their rigid links and sharp load path can lead to fatigue, wear, and potential sudden failure when bent, snagged, or continually loaded in a suspended configuration. The way they interact with hooks, anchor points, and sheaves in a suspended setup increases the risk of undetected damage and unexpected drop.

The other options are allowed because they are designed or rated for suspended service and tend to route smoothly over pulleys and edges, distribute loads more predictably, and be easier to inspect for wear in this application. Always follow the platform manufacturer’s instructions and ASME B30.23 guidance for the exact sling material and rigging configuration used.