PROCESSES AND EQUIPMENT FOR CHEMICAL AND OIL-GAS PRODUCTION LIMITING PLASTIC LOAD FOR A PRESSURE VESSEL WITH A TANGENTIAL BRANCH PIPE

摘要

This paper presents results of elasto-plastic analysis of a vessel with a tangential branch pipe subject to internal pressure. The finite-element method in the two-dimensional statement and the yield theory with isotwpic hardening are employed for nonlinear analysis. Different means and characteristic curves are examined for determination of limiting plastic pressure. The influence exerted by various geometric parameters on limiting pressure is demonstrated.Pressure vessels and equipment fitted with branch pipes are widely used in chemical and petrochemical machine building. Pressure vessels with radial branch pipes are most widely employed (we will call this position of the branch pipe tangential). Results of elastic analysis [1], which indicate a high level of stress concentration in the vessel and branch pipe owing to the abrupt change in the surface geometry of the design, are known primarily for vessels with a tangential branch pipe. In addition to elastic stress analysis for the designs under consideration, determination of the limiting plastic load based on inelastic analysis is a critical problem [2].