SHACKLE ASSEMBLY AND LOADING
SHACKLES & TURNBUCKLES
Shackle Assembly and Loading: Essential Guidelines
SHACKLE ASSEMBLY
Make sure that the shackle is supporting the load correctly, i.e. along the axis of the shackle body centreline, avoid introduction of bending loads, unstable loads and do not apply overloads.
SIDE LOADS
Side loads should be avoided. If side loads cannot be avoided, the following reduction factors must be taken into account.
[supsystic-tables id=482]
In line loading is considered to be a load perpendicular to the pin and in the plan of the bow. Load angles in the table are the deviating angles from the in line loads. When using shackles in connection with multi leg slings, due consideration should be given to the effect of angle between the legs of the sling. As the angle increases so does the load in the sling leg and consequently in any shackle attached to that leg.
When a shackle is used to connect two slings to the hook of a lifting device, a bow type shackle must be assembled with the slings in the shackle body and the hook engaged with the shackle pin. The angle between the slings should not exceed 120°. If symmetrically loaded the shackle may e used to the full WLL. To avoid eccentric loading of the shackle a loose spacer may be used on either end of the shackle pin. Do not reduce the width between the shackle jaws by welding washers or spacers to the inside faces of the eyes or by closing the jaws, as this will affect the properties of the shackle.
POINT LOADING
Shackles are used in lifting- and static systems as removable links to connect (steel) wire rope, chain and other fittings. Most of the times the load bearing component that connects to a shackle is of a rounded shape. Point loading of shackles during lifting operations is allowed by the minimum dimension of the rounded component to be lifted should be equal to or bigger than the bow size of the shackle being used. The maximum load of the configuration is limited by the component with the lowest WLL. Increasing the contact area by using bigger diameters and/or pad eyes can be an advantage. Sharp edges should be avoided.
Green Pin shackles can also be used below configurations. The maximum load of the configuration is limited by the component with the lowest WLL.
Pin-Pin configuration: When the shackle eyes touch and the pins do not bear properly, the configuration should not be used.
The crown of a Green Pin Sling shackle is wider than that of a standard shackle, thus creating a bigger bearing surface. The maximum load of the configuration is limited by the component with the lowest WLL.
Bow-Pin configuration: When shackle body of the inner shackle touches the shackle eyes of the outer shackle and body and pin do not bear properly, the configuration should not be used.
