Session: CT-04-01 Assembly of Bolted Joints - 1

Paper Number: 106273

106273 - Suggested Procedure for Determining the Pcc-1 – Appendix O Gasket Properties 

The ASME Pressure Vessel and Boiler Code Section VIII – Appendix 2 – Rules for Bolted Flange Connections with Ring Type Joints [1] has been used successfully for many years. An experienced engineer will apply the rules and, in most cases, the vessel will be operated for many years without leakage.  However, there have been many papers addressing its shortcomings [2, 3, 4]. The Gasket Properties of the Appendix 2 has not been updated with newer designs and materials. Its tabulated values are reminiscent of the “Asbestos time”.  Properties such us maximum gasket stress and relaxation are not considered.

The ASME – PCC-1 –Pressure Boundary Bolted Flange Joint Assembly [5] has introduced the Appendix 0 – Assembly Bolt Stress Determination to address some of the problems associated with the Appendix 2. Several new gasket properties were introduced without a procedure to determine them.  Two papers presented at PVP Conferences [6, 7] proposed a protocol to determine some of the gasket properties. 

In Europe the rules for calculating flanges and determining the gasket properties were updated with the EN 1591 - Flanges and their joints - Design rules for gasketed circular flange connections [8] and EN 13555 - Flanges and their joints – Gasket parameters and test procedures relevant to the design rules for gasketed circular flange connections [9]. Since their introduction there has been a major effort to test gaskets and determine their properties. Manufactures are publishing results and there are two public websites [10, 11] where values are posted.  With so many data available the purpose of this paper is to suggest a procedure to use the EN13555 data to determine the Appendix – O gasket properties.

Presenting Author: Carlos D. Girão Teadit Group

Presenting Author Biography: Carlos D. Girão is a Professional Mechanical Engineer with a Master of Science from the State University of Rio de Janeiro, Brazil. Senior executive with leadership roles in the Americas and India, he has been in the Fluid Sealing Industry for the past fifteen years. Mr. Girão has published several papers, patents and championed studies for standard setting organizations and conferences. He currently holds the position of Technical Director for the Teadit Group.

Authors:

Carlos D. Girão Teadit Group
Jose C. Veiga Teadit Group
Igor Meira Teadit