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verification. (September 2013) |
A padeye is a device often found on boats or ships that a line runs through or provides an attachment point. It is a kind of fairlead and often is bolted or welded to the deck or hull.
It is also used in oil and gas projects to assist in the purpose of lifting.
It is made of steel plate with radius at one side. Lifting is done with the help of a D-shackle or sling, which fits into the hole of the padeye. There may be one or more circular plates (cheek plates) welded around the hole.
The following check should be done for the design of padeyes and to keep the stress less than the allowable stresses:
At the hole:
At the base
Analysis on a padeye is commonly performed in accordance with the Air Force Stress Analysis Manual [2] or ASME BTH-1. [3] The methodology in ASME BTH-1 only allows for axially loaded lugs, whereas the methodology in the Air Force Stress Analysis Manual allows for axial loading, transverse loading, or oblique (combined) loading. [4]
Tests have confirmed that there are four potential failure modes for a lug plate: