Rigging is an essential part of any construction or manufacturing process. It involves the use of various ropes, cables, and chains to lift heavy loads and move them from one place to another. One of the critical components of a rigging system is shackles.
Shackles are U-shaped metal fasteners that are used to connect various rigging components. They have a pin or bolt that secures the two ends of the shackle, making it a versatile and reliable tool in the rigging industry. Shackles come in different shapes, sizes, and capacities, with each having a specific purpose depending on the job requirements.
Standard Shackles
Standard shackles are the most commonly used shackles in rigging. They are designed to have a wide range of capacities, from 1/3 to 55 metric tons, making them a versatile tool in the field. Standard shackles are forged, quenched, and tempered, giving them superior strength and durability. Their alloy pins are also designed to withstand high loads and resist deformation.
The working load limit of every shackle is permanently shown on the shackle body, making it easy to identify its capacity. Shackles can be hot-dip galvanized or self-colored, depending on the user's preference. Hot-dip galvanizing is a process of coating the shackle with zinc, making it resistant to corrosion, while self-colored shackles are left in their natural state.
Fatigue Rated Shackles
Fatigue-rated shackles are designed to withstand high loads and repetitive motion. They are commonly used in naval applications or offshore industries, where the rigging components are exposed to harsh conditions. Fatigue-rated shackles have a higher capacity compared to standard shackles and are ideal for demanding jobs.
RFID Equipped Shackles
RFID-equipped shackles are designed to provide real-time data on the shackle's location, capacity, and usage. RFID (Radio Frequency Identification) technology involves the use of a small chip embedded in the shackle and a reader that communicates with it remotely. RFID technology enhances safety and efficiency in rigging operations by providing accurate and timely data.
Proof Tested Shackles
Proof-tested shackles are put through rigorous testing to ensure that they meet or exceed their rated capacity. Proof testing involves applying a load that is 2 to 2.5 times the shackle's working load limit, and the shackle must not deform or break under this load. Proof testing provides confidence to the user that the shackle can withstand the job requirements.
Certified Shackles
Certified shackles are tested and certified to meet specific standards set by regulatory bodies or international organizations. Certification involves an independent third party verifying that the shackle meets the specified requirements, enhancing confidence in its performance. Certificates can be provided to designated standards, such as ASTM, ISO, or EN.
Conclusion
Shackles are an essential component of any rigging system, as they provide a reliable and versatile tool for connecting various rigging components. Standard shackles, fatigue-rated shackles, RFID-equipped shackles, proof-tested shackles, and certified shackles are some of the types of shackles available in the market. Each type has its unique features designed to meet specific job requirements. Choosing the right shackle type is critical to ensuring the safety and efficiency of the rigging operation.