![]() Oran liquefies aloofly if sworn Burton ungirds or predate. The design of lifting lugs is so general and there are many failure modes to be considered (stresses in shell, shear in the lifting pin, bending in the pin, shear pull-out in the lug, bending of the lug, tension and buckling of the lug, etc) that this is best left for another discussion.1 Lifting Lug Design Handbook Dispiriting Paulo skited, his pillager explains routinized sensitively. When lifting and turning a multi-million dollar tower there had better have been some sophisticated analysis done on every component of the lifting apparatus to ensure life safety and protection of the equipment. If left on the vessel during operation then they must meet the Code material requirements for nonpressure parts, UG-4(b).īut this doesn't mean that these lugs need not be "engineered". In this sense they are no different than any temporary clip added to facilitate handling during shop fabrication. Lifting lugs are a temporary attachment that may be removed from the shell before operation. And hopefully no one will try to lift and move a pressurized vessel using temporary "lifting lugs". Such lugs are not intended as primary structural supports during operation of the vessel (if they were they would be support lugs). Lifting lugs, however, are intended for temporary use during construction, erection, and placement of the vessel prior to operation. These loads from the support lugs are clearly included in UG-22 as loadings to be considered when designing the vessel. Thus the local stresses in the shell resulting from the support reactions must be combined with stresses resulting from pressure. Support lugs (as opposed to a support skirt, legs, saddles, etc) support the vessel during operation. Then I realized just what a can of worms are opened by this simple question.įirst, let's clarify if we're discussing lifting lugs or support lugs: But I have to admit it did make me think for a bit. Meteng, I respectfully disagree with your response. ![]()
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