For vertical vessels which undergo a rotational lift from horizontal shipping to vertical inservice, the lift lug is checked for all lift. The design ultimate load for an axially loaded lug is the minimum of the. Heres a simple sizing calculator for the most basic type of lifting lug. Lifting lug design mecalug software meca enterprises inc. Mecalug is a lifting lug software package that is used to design lifting lugs as well as analyze loads acting on lifting lugs for a structure or piece of equipment. This is a worldwide safety standard that is required for all commercial lift manufacturers. Different worksheets are reported for a complete verification of common configurations.
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 pullout in the lug, bending of the lug, tension and buckling of the lug, etc that this is best left for another discussion. It is important, however, that appropriate, are applied to any design load especially if the padeye is to be used repeatedly in illdefined conditions. Design lifting lugs with tank reinforcing pads that can we welded to the pm2a top and bottom half tanks. Rss on sheet 4 for the dimensions used to calculate the tail load. Several different styles of lifting lug are offered giving the user multiple options in selecting an appropriate lifting lug. See the instructions within the documentation for more details on performing this analysis. The basic structural design guides on the lifting lug of. The user can enter a desired factor of safety most applications, f. Lugs are connector type elements used as structural supports for pin connections. Download the study for lifting lug by kawish shaikh liftinglug. Hydraulic cylinder design all of bendpak lift cylinders use internal flow. Pad eye lug design with a side load as design engineers, it is our responsibility to make sure that our lug designs meet the latest codes before they are issued for fabrication, but due to the variables in fabrication, installation, field implementation, etc, the designs might not fit right or be used right to code. The asme bth1 standard for the design of belowthehook lifting devices has been revised.
Check it out, and as always you can download this, and many other excel tools at. This feature calculates the stresses within the lug as well as the local stresses of the vessel at the lug attachment location. Designevaluation of overhead lifting lugs pdh online. The spreadsheet verifies some configurations of lifting lugs and padeyes. This supporting document details calculations for the proper design of a lifting beam and redesigned lifting lugs for the 241az01a decant pump. Lateral loads are converted to bolt tension loads via the concept of shear friction. Proposed design criterion for vessel lifting lugs in lieu of asme b30. Design calculations and results the calculations and results are obtained from analyse option in the software. Pressure vessel lifting and rigging analysis codeware. The anchor load capacity depends on multiplefactors such as. Design evalution of overhead lifting lugs page 7 1. Lifting lug calculation asme mechanical code issues.
Design and verification of lifting lugs mec engineering. I injection system a6810 permas field substructure weight of component to be lifted component force acting on beam, f impact factor skid lug sizing distance from lug hole to edge of beam, k. Some lifting beams are made with a bottom lug aligned directly below the top lug so that, if the need arises, an occasional straight pick can be made without the inconvenience of having to remove the lifting beam. Analysis of lifting beam and redesigned lifting lugs for 241az01a. Horizontal to vertical lifting forces calculations. The officer responded to the question by saying that it was an emergency. A simple and conservative approach is to calculate the length of a single shear. This design uses the anchor bolt to clamp the steel baseplate down onto the concrete slabfoundation. Lifting lug design calculation tl rl d k tl htl hp r hc wp b a tp lp weight of vessel, we 1. Lifting solutions group lifting solutions lifting solutions certified shacklelok shacklestyle hoist rings shacklelok combines the strength of a hoist ring with the versatility of a shackle. Pdf this paper describes a method for evaluating the structural adequacy of various lifting lugs utilized. In this thesis an padeye engineering tool is developed, which is used to improve the calculations on padeyetochs connections used within seaway heavy lifting. Handling and storage when removing shackles from the lifting setup, it is good practice to reassemble the shackle immediately. Its unique, 3piece design is ideal for use with a variety of lift methods, and shackles are interchangeable.
Padeye design guidelines the following guide gives an overview of padeye design based on dnv design rules and common industry practice. Pdf proposed design criterion for vessel lifting lugs in lieu of. When lifting and carrying precast elements, the lifting load has to be. Padeye calculator technical helpthe padeye calculator is based upon the following calculation procedure. The lug analysis calculator allows for analysis of lifting lugs under axial, transverse, or oblique loading.
I agreed to design the lifting lugs and sent an email asking for the following information. For 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. Spreadsheet part 2 for the design and verification of lifting lugs and padeyes. Design engineering design engineering may 15, 2020. There are also several different configurations in the lifting lug software for different equipment and.
Therefore, design engineers are left without adequate technical guidance on. The printout below shows the design for a plate lug without any side load, but it is the basis for calculating the additional stress that a side load imposes on a plate lug and the weld. Engineering excel spreadsheet downloads welding design and engineering pressure vessel design and engineering. The new edition, released as asme bth12017 design of belowthehook lifting devices, updates and supersedes the 2014 version of the standard, continuing to serve as a guide for designers, manufacturers, purchasers, and users of belowthehook lifting devices. Design and analysis of lug joint in an airframe structure. A lug, also known as a lifting lug is essentially a plate with. Design calculations for lifting lug welded onto equipment, like pressure vessels etc. Module 4 lifting and rigging sm 4 1 introduction a fire officer on a pumper was once asked why he ordered the pumper engineer to drive the 30,000 pound fire apparatus on a road that had a bridge with a 10,000 load limit. For large vessels trunnion or standard heavy lifting lugs are used. A lug, also known as a lifting lug or a padeye, is essentially a plate with a hole in it. A lifting beam can also be used as a strong back to provide multiple lifting points on a relatively flexible object see fig. From this it seems that asme bth1 is more applicable to your condition than aisc 360 section d5.
Load capacity of an asymmetrical padeye welded to a jacket. Pdf proposed design criterion for vessel lifting lugs in. Design calculations for a lifting pad eye free pdf file. Lifting beams, lifting frames and lifting spreaders are a means of providing two or more lifting points from the hook of the lifting machine or crane spaced so as to match the position of the lifting points on the load. For clarification, the lug is part of a safety device and the force. Fea, lugs, pin, margin of safety, vonmises stress, ansys. Modern steel construction steel questions or comments to. Petersons stress concentration factors 3 rd edition loading kn p b cyclic loading design of belowthehook lifting devices asme bth12008 reference. The objective of this thesis would not have been reached without the help of others. Plate, ear, trunnion and tail type lift lugs are included. A basic study on the lifting lug design has performed through the rational and systematic process. There are many other lug calculations on the site with good. Design data total empty weight safety factor number of lifting lug sketch of lifting lug.
The verification is performed considering the reference design and construction of lifting beams david t. Design of vertical pressure vessel using pv elite software. Pdf design of belowthehook lifting devices sasikumar. Ricker, pe, aisc engineering journal, fourth quarter1991 and its. Lifting lug calculation structural steel bending scribd. Asme bth12017 design of belowthehook lifting devices. This failure mode involves bearing failure at the pinlifting lug interface. A guide to shackles for lifting purposes turn your.
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