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  How Fast Should You Test Lifting Slings? When testing lifting slings, most people focus on  test load  and  safety factor . But there is another critical parameter that is often overlooked:   Testing speed (loading rate). The speed at which the load is applied can directly affect: Test accuracy Safety during testing Final test results Sling performance evaluation In this article, we explain  why testing speed matters , how it affects different sling types, and best practices for setting the correct speed during sling testing. Why Testing Speed Matters for Lifting Slings Testing speed refers to  how fast the load is applied  to the sling during proof or breaking tests. If the loading speed is: Too fast  → shock load, unstable readings, unsafe conditions Too slow  → inefficient testing, possible creep effects on synthetic slings Proper speed ensures: Stable load application Accurate test data Compliance with industry standards Protection...

In port loading and unloading, offshore engineering, mining, wind power installation, and lifting operations in high-latitude regions,   shackles  often need to be used for extended periods in frigid environments. However, low temperatures are not simply a matter of being “a little colder”—they directly affect the mechanical properties of metal materials, thereby impacting lifting safety. Understanding and mitigating this change is crucial for ensuring the safety of every critical lift. How Low Temperatures Affect the Material Properties of Shackles？ Most shackles are made of carbon steel or alloy steel, which offer good strength and toughness under normal temperatures. However, in cold environments, steel undergoes the following changes:   Decreased Toughness and Increased Brittleness As temperatures drop, the ductility and energy absorption capacity of steel significantly decrease. Under impact or sudden loading, it becomes more prone to brittle fracture.   Increas...

  Weather conditions are often neglected in lifting operations. While most operators focus on the Working Load Limit (WLL) of a sling, environmental factors—particularly rain and moisture—can significantly impact its safe use. So, does rain actually weaken a lifting sling? Or does it introduce different risks altogether? This article explains  how wet conditions affect lifting slings , using clear examples and practical guidance for safe operations. Do Wet Slings Lose Load Capacity? Rainwater  does not reduce the rated working load limit (WLL)  of a lifting sling. A  1-ton sling remains rated at 1 ton , provided the sling is structurally sound and undamaged. However, moisture conditions introduce a range of other serious risks, which can indirectly and significantly compromise the safe load-bearing capacity of a sling. Therefore, it is essential to reduce its safe working load. Key Risks Introduced by a Moisture Environment Increased Weight (For Synthetic Slings...

  Incorrect calculation of sling load is one of the most common causes of lifting accidents. Many people assume that the force on a lifting sling is simply equal to the weight of the object being lifted—but in reality, the tension acting on a sling is often far greater than the weight of the load itself. This article breaks down how sling load is calculated, what factors affect sling tension, and how to avoid the most common mistakes in actual lifting operations. 1. What Is A Lifting Sling Load? Lifting sling load  refers to the actual force applied to each sling leg during a lifting operation. Key point to remember:  Sling load ≠ Load weight The load acting on a sling depends on: Lifting angle Number of sling legs Center of gravity Hitch type (vertical, choker, basket) Ignoring these factors can result in sling overload—even when the load weight is within the rated capacity. Impact of Sling Configuration on Load Distribution Different sling configurations significantly a...