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The New European Flange Design Method: Theory, Advantages, Comparison With Taylor Forge and DIN — Future Developments

[+] Author Affiliations
Fernando Lidonnici

Sant’ Ambrogio Servizi Industriali, Milano, Italy

Paper No. PVP2006-ICPVT-11-93151, pp. 125-134; 10 pages
  • ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference
  • Volume 2: Computer Technology
  • Vancouver, BC, Canada, July 23–27, 2006
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4753-5 | eISBN: 0-7918-3782-3
  • Copyright © 2006 by ASME


All the national standards dealing with Flange Design are generally based either on the Taylor Forge or on the DIN 2505 method. The assumptions used in both methods are more or less the same, that is, two different bolt loads are calculated separately for two different conditions: first the load at bolting-up, necessary for the seating of the gasket, and then the load needed to obtain leak tightness in service. In this way the flange calculation is made for two independent conditions, bolting-up and service (plus possibly a hydrostatic test condition), with no relationships with each other. However a bolted joint is a complex structure composed by two (possibly different) flanges, the gasket and the bolting; the bolt load varies from one condition to another as a consequence of the initial bolt tightening and of the elastoplastic (and creep) behaviour of all the interconnected components. The European Standard EN 1591 [1] has developed, for the first time, a method based on a more complex model of the bolted assembly. The method has been further developed in Annex G of EN 13445 Part 3 [2] (the European Unfired Pressure Vessel Standard), which is now under revision following to the results of experiments, also considering the different behaviour of liquids and gases from the point of view of leak tightness. The intention of this paper is not to explain in detail the theory used by EN 1591, but simply to describe the principles on which the method is based, and to compare the results of its use as an alternative to the other methods in a series of practical examples.

Copyright © 2006 by ASME



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