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ANSI/API TR 6AF

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Technical Report on Capabilities of API Flanges Under Combinations of Load, Third Edition
Edition: 3rd
American Petroleum Institute / 01-Sep-2008 / 79 pages

This technical report presents the results of analysis work done to establish the load capacity of all flanges given in the April 1986 Editions of API 6A and API 6AB. A total of 69 different geometries were analyzed initially. The various loads considered were:

  • Bolt makeup (preload).
  • Internal pressure.
  • Tension.
  • Bending moment.



All flanges were analyzed with an axisymmetric finite element model for each of the four load cases. A post-processor program was written to calculate the maximum moment capacity for various levels of pressure and tension, based on linear superposition of results. Three different criteria were used to establish the maximum moment:
  • ASME Section VIII, Division 2 allowable stress categories for the flange with the basic membrane stress allowable established by API;
  • Allowable bolt stresses as established by API; and,
  • Loss of preload on the ring joint.


The results of this post-processing are presented in plots of pressure vs. allowable moment for various tension levels. There are several limitations to this work which should be understood. First, the effects of transverse shear or torsion were not considered in the analysis. Second, the results are for static loading only. No dynamic, fatigue, or fretting phenomena were considered in these results. Third, no thermal stresses or elevated temperature effects were considered for this Bulletin.

These charts are not intended to replace a critical evaluation of any particular connection in an application where the charts show the flange to be marginal. The charts are intended to be used only as general guidelines for design. These charts are not intended to replace a critical evaluation of any particular ocnnection in an application where the charts show the flange to be marginal.



Product Code(s): G6AF03,G6AF03



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