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Characteristics of Commercially Available Integrally Reinforced Weld-On Fittings

[+] Author Affiliations
Charles Becht, V

Becht Engineering Inc., Liberty Corner, NJ

Anthony Paulin

Paulin Research Group, Houston, TX

Mark Stonehouse

Becht Engineering Canada Ltd., Calgary, AB, Canada

Donald Edwards

Consultant, Bartlesville, OK

John Cates

WFI International, Houston, TX

Paper No. PVP2016-63690, pp. V003T03A022; 8 pages
  • ASME 2016 Pressure Vessels and Piping Conference
  • Volume 3: Design and Analysis
  • Vancouver, British Columbia, Canada, July 17–21, 2016
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5039-8
  • Copyright © 2016 by ASME


Integrally Reinforced Weld-On Fittings (IRWO Fittings) are used often as branch connections in piping systems. Original taper-bore designs are from Bonney Forge, and original straight-bore designs are from WFI. Numerous other manufacturers now fabricate these fittings under various names, but all Markl-type Code testing of these fittings was performed on either the Bonney Forge or WFI geometries. The original IRWO fittings were not intended to be used in large size-on-size configurations and were designed with various area replacement strategies (50% or 100% reinforcement in the fitting) and were based on an extensive series of burst tests. Stress Intensification Factors (SIFs) were developed by extending existing ASME Section III [3] Equations for fabricated tees after several series of tests were conducted, (See WRC 329 [2]). Taper-bore designs were developed to facilitate handling during fabrication, but inadvertently also produced larger footprints which reduced stress intensification factors but introduced installation issues that were all but eliminated with the straight thru bore design, (i.e. with the taper bore design, should the hole in the run pipe fit the taper ID or the branch ID?) IRWO tests on partially welded-out geometries and on alternate geometry designs are presented along with finite element (FEA) results that indicate where additional testing is needed and where the pipe designer should exercise additional caution.

Copyright © 2016 by ASME
Topics: Fittings



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