Instructions for use of Lifting Lugs
These instructions deal specifically with container lifting lugs known as the 'Preston Shoe' and covers it's handing, slinging and use for normal lifting.
Care must be exercised when attaching any type of lifting lug to the top lifting device, be it a hook on a crane, to strops suspended from a conventional top lifting frame when handling out of gage units. The general rule is that all items in any sling assembly must be rated at the same WLL. At the bottom end, the appropriately handed lug must be attached to the slings for coupling with the right or left hand corner fitting apertures. The handing features of the Preston Shoe are shown below. The lug, in turn, is usually attached by chain connectors or shackles to the slings. The slings in turn may be chain, cable or webbing, the latter being used for empty or lightly loaded containers only.
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Corner Fittings Handing for Normal Lifting.
For the purpose of explanation only, the corner box aperture faces in the above diagrams are shown colour coded, therefore, lugs should normally be used in the appropriate left hand or right hand aperture as shown in the above diagrams. Instructions for use are found under Normal Lifting
Under certain circumstances where access to the normal aperture used for lifting is obstructed, it may be necessary to use the adjacent aperture to move the container to a more favourable position for lifting in the preferred manner.
What is important, in this scenario, is that an adjacent aperture is of the opposite hand to that of the lug as can be seen in above handing diagram and is referred to as Reverse Hand Lifting, however, the 'EAR' must ALWAYS be upermost when lug is inserted into any corner fitting aperture.
Slinging Lifting Lugs
These lugs can be used with either cables or chains having the same WLL, 8.5t (16mm chain) or 12t (20mm chain).
When choosing slings for lifting fully laden freight units the sling forces must be within the WLL range of lifting lugs. When lifting slings are at an angle the sling forces increase and when at 30° sling forces are twice those when lifting slings are vertical.
Any suitable connector can be used but for most applications chain connectors and Screw Pin "Bow" or "Dee"shackles are recommended as shown here.
Whatever connector is used, the lug face must be parallel to corner fitting face being coupled with. If at right angles after assembly, it may be necessary to remove one link to remedy this.
When screw pin shackles are used, shown here, the screw-pin head must be on the same side as the 'EAR' on lug side so that the assembly can be laid horizontally when in the insert position.
Irrespective of use, the 'EAR' must ALWAYS be upermost when lug is inserted into corner fitting aperture.