Flange Face Parallelism Standard
Flange Face Parallelism Standard
(OP)
Does anyone know of industry standards addressing parallelism of flange faces prior to installation? We have experienced a cracked fillet weld at the socket connection of a short lap-joint flange hub into a rigid pressure vessel. During installation, as the raised faces (piping flange and hub) were drawn together, the weld had to resist the strain-induced stress required to make the out-of-parallel RF faces parallel. The fillet weld complied with ASME BPV Code standards, but apparently that was inadequate to handle the structural bending load.





RE: Flange Face Parallelism Standard
Pipe Fabrication Institute
ES3- "Pipe fabrication tolerances"
www.PFI.org
RE: Flange Face Parallelism Standard
Try
pfi@pfi-institute.org
RE: Flange Face Parallelism Standard
RE: Flange Face Parallelism Standard
RE: Flange Face Parallelism Standard
http://www.standard.no/imaker.exe?id=1358
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/
RE: Flange Face Parallelism Standard
Figure F-1 for External Dimensions, Nozzle and Support Locations
and, just for general culture...
Figure F-2 for Tubesheets, Partitions, Covers, and Flanges.
Cheers
saludos.
a.
RE: Flange Face Parallelism Standard
Thanks to rconner and cvg for their anecdotal input.
Our objective is simply to establish the amount of strain that the weld connection of a flange hub would have to withstand when our flange is drawn to an axially aligned but out-of-parallel rigid flange face. We would hope that we can avoid a limitation on horsepower of a backhoe used to draw the flange faces together
RE: Flange Face Parallelism Standard