This document is provided for educational purposes only. E blatch has written a paper published by asme called bolted flanged connections for non circular pressure vessels from advances in bolted technology 1989 this may be of some help. Flange, obround, noncircular, pressure vessel, linearization, fea 1. It covers the design of obround and rectangular shaped flanges which comply with the asme bpvc codes. The handbook reflects the continuous revisions of the asme boiler and pressure vessel code, section viii, division 1. There are, however, certain cases of pressure vessels or pressure ducts when a rectangular or other noncircular shape is required, be it for space reasons cyclone inlets, or for process reasons pulp chutes and feeders, etc. The pressure vessel handbook covers design and construction methods of pressure vessels made of carbon steel. The method for design of noncircular pressure vessel flange is developed by adolf e. Shortcomings in the proposed asme flange design method asme bfj and current cen flange design methods en1591 are highlighted and methods for resolution of these issues are suggested. Noncircular pressure vessel flanges new design methods most pressure vessel and pipe flanges are circular in cross section for the obvious favorable geometry of the cylindrical shape. An update on improved flange design methods pressure. Design of obround flange for pressure vessel application. Further analysis on aspects such as gasket creep and the use of leakagebased design has been conducted. Loads on flanges the asme way asme viii1 appendix 2 provides a method of sizing flanges.