Crosby Rigging Tips: Choker hitch, all slings

one of the basic hitches when using slings is called the choker hitch the choker hitch is formed when one leg of the sling connects back to itself a choker hitch does not have the full capacity of the straight leg vertical hitch the choker hitch capacity is approximately 75 percent of the straight leg vertical hitch choker hitch is formed in wire rope slings are stated to be approximately 75 percent of the single leg hitch synthetic slings and chain slings are stated to be 80 percent of the single leg capacity this capacity assumes that the angle of Choke is at least 120 degrees some standards such as API RP 2D offshore environments requires slings of all types when used in a choker hitch application to have a capacity of no more than 70 percent of the straight leg vertical hitch the sling's capacity is reduced further if the angle of Choke is less than 120 degrees in fact if the sling is bent back over itself with the angle of its choke approaching zero degrees the slings capacity would be reduced by 50 percent a single leg choker hitch is easy and convenient to use and can work well on simple short loads but it does not always provide the load control and grip needed for safe and effective rigging sometimes multiple leg slings choked on both ends of the load are required to gain the load control necessary if choker hitches are used the user must always ensure that the slings cannot slip or slide along the load it is important to note that a standard choker hitch does not provide a full 360 degree contact with the load a double wrap choker hitch is better for handling those Hard to Handle loads and bundles of materials like rods or pipe that require more sling contact to hold them in place make sure the slings do not overlap at the bottom of the load when you form the double wrap choker as a final note the user should always make sure that all slings are protected from edges corners protrusions or abrasive surfaces in order to protect the Sling from any damage Hardware can be used to form the various choker hitches the use of Hardware simplifies the connection as well as the operation of the swings used in choker hitches whether it is grab hooks for chain slings shackles and sliding choker hooks for wire rope slings or the webbing sling hook for synthetic choker hitches in all these cases the hardware allows the connection and disconnection of the choker hitch without pulling the sling body through an eye or a link when using chain a cradle grab hook provides the full rating of the vertical leg capacity when using wire rope a screw pin shackle with a pin in the eye offers a simple method of connecting when using a web sling the sliding choker hitch prevents bunching and simplifies the connection and disconnection of the sling

Channel: Crosby

Views: 289,694

Keywords: choker hitch, hitch, rigging, rigging tips, crosby, the crosby group

Id: il4u-97_dQg

Length: 4min 2sec (242 seconds)

Published: Tue Mar 03 2015