#Lifting lug design calculations formula full#

If welding directly onto horizontal plate then the plate must be specified as EMZ grade to prevent delamination of the plate under tensile load. It is good practure to extend the base of the padeye to pass it completely through the structural member which it is connected to.

#Lifting lug design calculations formula full#

Padeye WeldingДЄll padeyes must be welded to the primary struture by use of full penetration welds. These must be fitted as additional plates welded onto the padeye profile and not a single boss as shown below.ДЇor equipment used in a marine environment, all padeye materials are to be S335J2 (BS EN 10025) supplied with 3.1 material inspection certificates to BS EN 10204. If required plated supports can be added to the symmetric design to increase the lateral stiffness of the padeye, useful when the padeye will be subjected to dynamic load angles.ДЇor a multi-point lift it is essential that the padeyes point directly to the lift point centre to prevent lateral bending moments on the padeyes, DNV suggest a tolerances of 2.5 degrees as an allowable misalignment.ДЇor padeyes rated above 2000kg capacity cheek plates must be fitted to reduce the play in the shackle-padeye connection. For straight lifting angles a symmetric padeye design should be used, for a multi-point lift as in a offshore container or frame then a nonsymmetric design can be used. The correct design of padeye should be selected based on the particular load application. The thickness of the padeye at the hole shall not be less than 75% of the inside width of the joining shackle.The diameter of the holes in the padeye shall match the shackle used, clearance between shackle pin and padeye hole shall not exceed 6% of the shackle pin diameter.The following guide gives an overview of padeye design based on DNV design rules and common industry practice.ДЇor any manufactured equipment, the geometry of the padeye must match the size of shackle to be used to ensure a rated connection between the equipment and the lifting set.ДNV states two key sizing rules which are of importance: