Session: HT-03-01 Materials & Fitness for Service Methods for High-Pressure Vessels and Piping

Paper Number: 102994

102994 - Bending Moment in Flange Design, Capacity, Allowable Loads and Fea Methodology 

There are many types of flange and clamp connectors in use and described by different standards. Most of them are based on the linear elastic methodology and allowable stress concept (ASME, API flanges). More modern designs (ISO 27509 and NORSOK L-005 Compact Flanges, NORSOK U-001 subsea flanges) are based on elastic plastic principles and plastic collapse capacities. For all of them defining the tensile structural and functional limits is relatively transparent and seamless process. Often the external allowable Bending Moment load at rated Pressure is one of the most critical characteristics for subsea use and High-Pressure connections. To predict capacity and allowable Bending Moment is more complicated especially for modern flange types. In this paper author will focus and explaining already existing design methods with relation to the FEA assessment and modern connections structural and functional capability. The topic will be discussed based on the Compact Flange (ISO 27509 and NORSOK L-005) connection example and in related structural FEA long term functionality check based on DNVGL-RP-F112 recommendations (Hydrogen Induced Stress Cracking for subsea Duplex and Super Duplex material). In the presented example the focus will be on the flange itself, but the attached pipe also be included in the evaluation. The topic discussed in the paper and the conclusions are included in the FEA recommendation in the newest national NORSOK L-005 flange design code release.

Presenting Author: Przemyslaw Lutkiewicz DNV AS

Presenting Author Biography: Przemyslaw professional engineering experience stared at CERN in 2001 (Technical Student, Fellowship and Doctoral contracts). Since 2008 he is a part of Freudenberg Oil & Gas Technologies engineering team at Norway, Drammen office. From this year is working on the new Principal Engineer position at DNV AS and piping group.

At CERN, his work was related with LHC and CLIC accelerators projects and UHV components design.
At Freudenberg he has been working for HTHP components development (new 5, 10, 15 and 20 ksi SPO CF pressure classes), participate in API 17TR8 code validation study (in frame of Deep Star project and 20 ksi flange design) and working on new ISO 27509 standard release (as a member of ISO/TC 67/SC 6/ WG 5 committee). In day to day work, he is developing bespoke FEA simulations, as well as hand calculations methodology for a range of high-profile clients and in frame of the internal R&D projects, focusing on the topside and subsea applications.

Przemyslaw graduated from CERN and Cracow University of Technology with first class master’s in civil engineering (Major in Computational Mechanics) and engineering doctorate in Mechanical Engineering (Major in Computational Mechanics) defended with distinction. He is chartered engineer with the Institute of Mechanical Engineering and holds EUR Ing license (FEANI).

Authors:

Przemyslaw Lutkiewicz DNV AS