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Requirements for Numerical Flange Calculations According to the German Nuclear Code

[+] Author Affiliations
Robert Kauer

TÜV Süddeutschland Bau und Betrieb GmbH, München, Bavaria, Germany

Paper No. PVP2002-1096, pp. 179-187; 9 pages
doi:10.1115/PVP2002-1096
From:
  • ASME 2002 Pressure Vessels and Piping Conference
  • Analysis of Bolted Joints
  • Vancouver, BC, Canada, August 5–9, 2002
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-1944-2
  • Copyright © 2002 by ASME

abstract

In Europe as well as in other countries a lot of effort is invested into developing new codes and standards for bolted joints under various loading conditions. The standardization of gasket factors and the improvement of calculation methods with respect to these factors characterize the last couple of years in this area. In Germany the nuclear code (KTA) is also influenced by this development. So, the leak rate dependency of gasket factors and the results of a research program on metal-to-metal contact type flanges were introduced into the new approach of the code for Class 2 and 3 components. Herein flange calculations can be performed for various flange types, floating type and metal-to-metal contact type. Generally, the calculations to be performed can be separated into a design step and the proof of sufficient tightness and strength of flange, bolts and gasket for the various operating conditions according to the chosen bolting method. In this step the stiffness of all components (flanges, bolts and gasket) and its influence on the mechanical behavior of the entire system is considered. Besides, influences caused by thermal effects, e.g. different thermal expansion between the flanges and the bolts, or seating effects in the gasket must be regarded. In cases, where the allowable stress values are not satisfied by performing code calculations or in cases, where the applicability of the code is not given, e.g. due to geometric facts, Finite-Element analyses often replace code calculations to show code compliance. Therefore, numerical Finite-Element analyses, performed according to a special code, e.g. KTA, must also fulfill the requirements of the code with respect to considered load cases, bolting condition, allowable stresses etc., to get an adequate testimony for a certain flange joint. In this paper certain methods for numerical calculations will be presented and compared to the results of the code for various flange types and dimensions.

Copyright © 2002 by ASME
Topics: Flanges

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