Evaluation of the Structural Suitability of Lifting Trunnions in Large Pressure Vessels

Abstract

Pressure vessels are designed to meet operational requirements, and their primary purpose is to maintain the required pressure without sustaining damage. In addition, pressure vessels must be equipped with appropriate attachments to allow for proper lifting, transportation, and erection. When designing a pressure vessel, it is important to consider the size of the trunnion structure and the location of such lifting trunnions. Compared with normal pressure vessels, large pressure vessels are very heavy and can weigh up to several tons. Because of the substantial weight, the lifting components of pressure vessels can fail during erection and transportation if they are not properly designed. Several analyses, including Welding Research Council Bulletin 107 (WRC 107), must be performed to predict the failure of these components. Such predictive evaluations can prevent errors at the site. This study validates methods for evaluating the structural suitability of lifting trunnions used in the erection and lifting of large pressure vessels.