Session: CT-01-02 Design and Analysis of Bolted Flange Joints-2

Paper Number: 124252

124252 - Flange Deformations Induced by Ring Joints: An Fea and Experimental Approach 

In the petrochemical and off-shore industry, ring joints are crucial for their ability to handle high-pressure and temperature demands. Nonetheless, the tightening forces combined with direct metal-to-metal contact might cause flange sealing surfaces damage. The present study investigates the deformations in flanges sealing surfaces due to ring joints, with a particular focus on different ring geometries, materials and hardnesses. Leveraging finite element analysis (FEA) and a series of laboratory tests, this research evaluates how these variables impact the integrity and performance of ring joint-flange assemblies.

Two novel types of rings were introduced: the first is a hollowed ring, inspired by a topology optimization study that identified unnecessary interior regions of a standard ring. The second employs metal 3D-printing techniques, specifically Selective Laser Sintering (SLS) and Metal Fused Filament Fabrication (MFFF), utilizing stainless steel grade 316L. Both designs underwent testing and were compared with standard oval & octagonal ASME B16.20 R-16 rings in terms of deformation and sealability.

The study also addressed a common claim regarding a hardness difference of 30 HB (Brinell hardness) between the ring and flange, exploring the theoretical hardness gap necessary to avoid permanent flange deformation. The research, while facing challenges in material data and measurement techniques, offers novel ring design approaches and an in-depth understanding of the plasticity effects on ring joint assemblies.

Presenting Author: Leonardo De La Roca TEADIT

Presenting Author Biography: Leonardo is a Mechanical Engineer with a degree from Rio de Janeiro State University. Currently holds the position of Research & Development Specialist at Teadit Group.

Authors:

Leonardo De La Roca TEADIT
Carlos D. Girão TEADIT
Jose C. Veiga TEADIT