What is the correct procedure for inspecting a load chain on an overhead crane, according to ASME B30.9?

According to ASME B30.9, the correct procedure for inspecting a load chain on an overhead crane involves several steps. First, a visual inspection of the entire chain length must be performed. This inspection should check for signs of wear, nicks, gouges, cracks, stretch, distortion, and heat damage on each link. Look for corrosion, especially pitting, which weakens the chain. Next, the chain should be checked for proper lubrication. A dry or poorly lubricated chain will experience increased wear and friction, reducing its lifespan and load capacity. After the visual inspection, the chain should be measured for stretch. ASME B30.9 specifies the maximum allowable stretch, typically a percentage of the original chain length (e.g., 3% or as specified by the manufacturer). Stretch is measured using a calibrated measuring device over a specific number of links. If the stretch exceeds the allowable limit, the chain must be removed from service. Each link should be examined for damage, paying close attention to areas that come into contact with the load or other components. The master links, hooks, and connecting hardware must also be inspected for wear, distortion, and damage. Any bent, cracked, or worn components must be replaced immediately. If the chain has been subjected to an overload, it should be removed from service and inspected by a qualified person using non-destructive testing methods, such as magnetic particle inspection or dye penetrant testing, to detect any hidden cracks. All inspection findings must be documented, including the date of inspection, the inspector's name, and any identified defects. For example, if a chain link shows a crack, the chain must be immediately removed from service, tagged as defective, and replaced before the crane is used again. Regular inspections, as defined by the standard and the crane manufacturer, are crucial for maintaining the safety and reliability of the crane.