Select the orientation for the lug.
-
Flat - Indicates that the lug extends in the same direction as the vessel axis. This is a flat orientation.
-
Perpendicular - Indicates that the lug extends radially away from the vessel wall. These lugs are referred to as ear type lugs. They are typically used on the tops of horizontal vessels.
If you are working with a perpendicular lug and there will be no bending stresses in the lug, you will need to set the offset dimensions (moment arms) to 0. The program will run, but may give some warnings. This type of lifting lug would be one on the top of a horizontal vessel and the vessel would be lifted by a spreader bar equally distributing the weight load directly over each lug. Thus there would be no bending.