Lifting lugs must be provided for moving and erecting a pressure vessel. The location of these lugs and the loads that will be applied to them depend on how the vessel will be moved and erected. The details are usually worked out between the fabricator of the vessel and the construction contractor who will be responsible for erection. A rigging diagram should be provided to the fabricator by the construction contractor. The static loads on the lugs resulting from the weight of the vessel are usually multiplied by a factor, depending on the construction contractor’s lifting procedure and experience, to accommodate dynamic loads that can be developed during the lifting.
There are no Code criteria for maximum allowable stresses that can be used for design of the lifting lugs. They are designed to prevent damage to the vessel during installation only, and they have no effect on the integrity and reliability of the vessel during operation.
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