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...