Case Study 103: Tonne Bag Secured by Knot.
Incident Overview During a lifting operation, a slinger attempted to lift a tonne bag by tying a knot at the top of the bag, instead of using the designated lifting eyes provided by the manufacturer. The knot was used to “secure” the load and prevent it from falling out of the bag. No lifting accessories were connected to the lifting eyes. The bag had been previously used multiple times and contained full gas bottles, increasing the risk of catastrophic failure. There was no lift supervisor present, and the lift plan did not define any lifting methodology. What Went Wrong Tonne bag not lifted using manufacturer’s lifting eyes Load secured using a knot, not a rated lifting method Bag fabric and stitching took the full load instead of designed lifting points Bag reused beyond safe condition Gas bottles lifted in a non-approved container No lift supervisor present Lift plan missing lifting methodology Slinger demonstrated lack of understanding of safe rigging practices Key Lessons Learned Tonne bags are designed to be lifted only from certified lifting eyes Knots do not create a safe or rated lifting point Fabric and stitching are not designed to carry dynamic lifting loads Improvised methods increase risk of sudden failure Lack of supervision allows unsafe practices to happen Safety Recommendations Always use the manufacturer’s lifting eyes for tonne bags. Never tie knots or use fabric as a lifting point. Do not reuse tonne bags unless certified for repeated lifting. Never lift gas bottles in non-approved lifting containers. Ensure a competent lift supervisor is present during lifting operations. Lift plans must clearly define the lifting method and equipment required. Incident Source Real site observation – UK construction site (2026). Image evidence showing tonne bag secured by knot instead of using lifting eyes. Regulatory Mapping ● LOLER Reg. 4 – Lifting accessories must be suitable and used correctly. ● LOLER Reg. 8 – Lifting operations must be properly planned and supervised.