【Haichuan Safety Discussion】Hidden Dangers Around Us – Using the Chains of a Manual Winch to Directly Tie Up Loads
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Walk every day, and you need not fear thousands of miles； Do it often, and you won’t fear a thousand things. Learn one safety in production knowledge point every day, continuously strengthen memory, and improve professional skills in safety in production. As a worker, the more vigilant you are, the greater your chances of survival ； As a business manager, more strictness means fewer risks. Only by treating every detail with professionalism can the safety goal of \"zero accidents\" be truly achieved. Safety is never a \"choice question\" but a \"must-answer question.\" There is no such thing as “more or less” when it comes to safety; there is only “100%”. A little more careful inspection today means fewer risks of accidents tomorrow. Security management is never a matter of focusing on the big issues while ignoring the small ones. The significance of identifying potential hazards lies in turning \"invisible risks\" into \"visible actions for correction.\" We firmly believe that every improvement in safety awareness and every enhancement in protective capabilities serves to build a stronger shield for lives and ensure safety for businesses. Keep hidden dangers in sight and have safety by your side at all times! --------------------------------------------------------------------- All marine enthusiasts are welcome to participate in the discussion and share their insights on this thread: [HaiChuan Safety Discussion] – A compilation of potential hazards around us. https://bbs.hcbbs.com/thread-5705518-1-1.html HaiChuan is better with you all ------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------
According to the \"Technical Standards for Safety in the Construction of Petrochemical Projects (GB/T 50484-2019)\\", 5.2.10 states that when attaching a rope clip to a hook, the clip should be placed at the bottom of the hook. Gourd chains must not be used to directly tie down lifted objects. Explanation: It is prohibited to use gourd-shaped chains to directly tie down loads, as the intended purpose of such chains does not match the requirements of tying operations. This leads to four serious risks: uneven stress distribution, chain damage, load slippage, and equipment damage. I. Core reason: Severe conflict between design and operating conditions. The design of hook chains is intended for vertical, linear movement with uniform force application, with tension being transmitted through sprocket engagement; they are meant for lifting only, not for binding. When bundled, the chain is forced to bend, twist, and cross, which completely goes against its design for withstanding forces. There is a point/line contact between the chain and the load, rather than a surface contact with the lifting rigging, which makes slipping easy and can cause damage to the chain. II. Direct hazards (by risk level): 1. Chain breakage and falling of heavy objects (most fatal). Local overloading: At the sharp bends formed by the bindings, stress concentration is much higher than the allowable load of the chain, causing the chain links to break instantly. Structural damage: The sharp edges of the lifted objects directly cut or compress the chains, damaging the metal grains and welds, which results in a sharp drop in strength. Fatigue accumulation: Repeated bending and twisting accelerate metal fatigue, with tiny cracks expanding rapidly leading to fracture. Consequences: Heavy objects falling at high speed can cause mass casualties, equipment damage, and fires or explosions (especially in petrochemical scenarios). 2. Slipping or toppling of the load (high probability): The surface of the chain is smooth, and the friction from tying it is much lower than that of specialized slings/wire ropes, making it very easy for the connection to loosen. Bundling cannot ensure stable center of gravity, causing the lifted object to swing, flip, or fall. 3. Damage to the winch itself (rendering the equipment unusable): Abnormal forces on the chain can cause the sprocket to get stuck, the gears to be damaged, and the hook to bend, resulting in permanent failure of the winch. The braking system is subjected to impact loads, the ratchet and friction pads fail, causing the heavy object to slide uncontrollably. III. Compliant alternatives (mandatory): Use specialized lifting gear: select wire ropes, synthetic fiber slings, special lifting chains, shackles, etc., based on the weight and shape of the load to be lifted. Proper hanging: The rope clip must be attached to the bottom of the hook; it is strictly prohibited to attach it to the tip of the hook ； Use shackles for a secure connection to ensure that the forces are applied vertically and evenly. Substitution is strictly prohibited: Gourd chains are intended solely for lifting heavy objects, and must never be used as tools for tying, pulling, or securing. Read 3376 Manual Hoist Safety Rules
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