9.4 Materials Handling, Storage, Slings & Overhead Cranes (1910.176, 1910.179, 1910.184)
Key Takeaways
- 29 CFR 1910.176 requires materials stored in tiers to be stacked, blocked, interlocked, and limited in height to prevent sliding, collapse, or falling.
- Overhead and gantry cranes (29 CFR 1910.179) must have their rated load clearly marked on each side, and new or modified cranes require an initial load test of at least 125% of rated capacity.
- Crane inspections are categorized into frequent (daily to monthly) and periodic (1 to 12 month) inspection intervals, with upper hoist limit switches tested daily.
- All rigging slings (29 CFR 1910.184) must feature permanently attached, legible capacity tags detailing manufacturer, material, and rated capacities for straight, choker, and basket hitches.
- Slings must be immediately removed from service when removal criteria are met, such as 10 broken wires in one rope lay for wire rope, or missing capacity tags and melt marks for synthetic web slings.
9.4 Materials Handling, Storage, Slings & Overhead Cranes (1910.176, 1910.179, 1910.184)
General Materials Handling and Storage (29 CFR 1910.176)
Under 29 CFR 1910.176(a), clearance must be provided in aisles, at loading docks, through doorways, and wherever turns must be made. Aisles and passageways must be kept clear, appropriately marked, and maintained in good repair with no obstruction that could create a hazard.
Stacking and Material Storage Rules (1910.176(b))
Storage of materials shall not create a hazard. Bags, containers, bundles, pallets, and lumber stored in tiers must be:
- Stacked: Placed systematically to maintain structural equilibrium.
- Blocked and Interlocked: Cross-tied or blocked to prevent lateral movement.
- Height-Limited: Stacked only to heights that ensure stability against sliding or collapse.
- Housekeeping: Storage areas must be kept free from accumulations of materials that pose tripping, fire, explosion, or pest harborage hazards.
Overhead and Gantry Cranes (29 CFR 1910.179)
29 CFR 1910.179 applies to overhead and gantry cranes, including semigantry, cantilever gantry, wall cranes, and storage bridge cranes.
Marking Rated Load (1910.179(b)(5))
The rated load of the crane shall be plainly marked on each side of the crane, and if the crane has more than one hoisting unit, each hoist shall have its rated load marked on it or its load block, legible from the ground or floor level.
Initial Load Testing (1910.179(k)(2))
Before initial use, all new, extensively repaired, or altered cranes must be load tested by or under the direction of an appointed person. Test loads shall not be less than 125% of the rated load (unless manufacturer recommendations state otherwise).
Crane Inspection Classifications (1910.179(j))
Crane inspections are divided into two primary operational classes based on component exposure to wear:
- Frequent Inspection: Visual and operational inspections performed at daily to monthly intervals:
- All functional operating mechanisms for maladjustment (daily).
- Limit switches governing upper hoist travel (tested at start of each shift).
- Lines, tanks, valves, drain pumps, and hydraulic systems for deterioration/leakage (daily).
- Hooks for deformation, cracks, or throat opening increase (monthly visual with signed record).
- Hoist chains and wire rope for wear or distortion (monthly).
- Periodic Inspection: Complete visual and structural inspections performed at 1 to 12 month intervals:
- Deformed, cracked, or corroded structural members and bridge girders.
- Loose bolts, rivets, or fasteners.
- Worn sheaves, drums, pins, bearings, shafts, and locking devices.
- Electrical apparatus, controller switches, limit switches, and pushbuttons.
Rigging Slings (29 CFR 1910.184)
29 CFR 1910.184 covers slings used in conjunction with material handling equipment for hoisting loads. It covers five primary sling types: alloy steel chain, wire rope, metal mesh, natural/synthetic fiber rope, and synthetic web.
Mandatory Identification Tags (1910.184(e)(1), (f)(1), (g)(1))
UNIVERSAL SLING RULE: Every sling must feature a permanently attached, legible capacity tag or identification marking. If the tag is missing, illegible, or defaced, the sling must be immediately removed from service.
Capacity tags must specify: manufacturer name, rated load capacities for specific hitch configurations (straight, choker, basket), and sling material grade.
Comprehensive Breakdown of Sling Removal / Rejection Criteria
| Sling Type | Mandatory Inspection Interval | Specific Criteria Requiring Immediate Removal from Service |
|---|---|---|
| Alloy Steel Chain Sling (Grade 80 / 100) | Thorough inspection at least once every 12 months (documented with written record). | • Missing or illegible rated capacity identification tag.<br/>• Cracks, severe nicks, or gouges in chain links or attachments.<br/>• Wear exceeding allowable manufacturer limits on link diameter.<br/>• Stretched, bent, twisted, or deformed chain links.<br/>• Evidence of heat damage or weld spatter. |
| Wire Rope Sling | Visual inspection daily before use by competent person. | • Missing capacity tag.<br/>• 10 randomly distributed broken wires in one rope lay, or 5 broken wires in one strand in one lay.<br/>• Wear or scraping of 1/3 the original diameter of outside individual wires.<br/>• Kinking, crushing, birdcaging, main strand displacement, or heat damage. |
| Synthetic Web Sling (Nylon / Polyester) | Visual inspection daily before use by designated person. | • Missing or illegible capacity tag.<br/>• Acid or caustic chemical burns.<br/>• Melting, charring, or weld spatter on any part of the web.<br/>• Holes, tears, cuts, snags, or embedded abrasive particles.<br/>• Broken or worn stitches in load-bearing splices. |
| Metal Mesh Sling | Visual inspection daily before use. | • Missing capacity tag.<br/>• Reduction in wire diameter of 25% due to abrasion.<br/>• Lack of flexibility due to distortion of mesh links.<br/>• Cracked weld or brazed joint in terminal handle attachment. |
What is the minimum test load requirement under 29 CFR 1910.179(k)(2) for initial load testing of a new or extensively modified overhead crane?
Under 29 CFR 1910.184(f)(5), what threshold of broken wires requires immediate removal of a wire rope sling from service in general industry?
Under 29 CFR 1910.184(e)(3)(i), how frequently must employers perform a thorough, documented periodic inspection of alloy steel chain slings?
What defect or condition requires immediate removal of a synthetic web sling from service under 29 CFR 1910.184(i)(9)?