Wester Forge

Flange Tolerances

  OUTSIDE DIAMETER ***     HUB
     
  When O.D. is 24" or less------------------------ ± .06"   Welding Neck  
  When O.D. is over 24"---------------------------- ± .12"   Outside Diameter of hub at point of Weld  
     
  INSIDE DIAMETER   5" and smaller------------------------------------- + .09" - .03"
     
  Slip-On, Lap Joint   6" and larger-------------------------------------- + .16" - .03"
     
  10" and smaller------------------------------------- + .03" - .0"   Long Welding Neck ( O.D. of Neck )  
  12" to 24"-------------------------------------------- + .06" - .0"   10" and smaller---------------------------------- + .09" - .03"
  26" and larger---------------------------------------- + .12" - .06"   12" and larger------------------------------------ + .09" - .06"
     
  Welding Neck, Long Welding Neck
  DRILLING
     
  10" and smaller------------------------------------- ± .03"   Bolt Circle Diameter---------------------------- ± .06"
  12" to 18"-------------------------------------------- ± .06"   Bolt Hole Spacing------------------------------- ± .03"
  20" and larger--------------------------------------- + .12" - .06"   Concentricity of Bolt Circle and Facing ≥ 2 1/2" ± .03"
≤ 3" ± .06"
     
  DIAMETER OF CONTACT FACE   OVERALL HEIGHT
     
  1/16" Raised Face--------------------------------- ± .03"   Threaded, Slip-On, Lap Joint  
  1/4" Raised Face, Tongue and Groove,   All Sizes-------------------------------------------- ± .06"
  Male or Female------------------------------------- ± .02"   Welding Neck  
     
  DIAMETER OF COUNTERBORE   4" and smaller------------------------------------ ± .06"
     
  Threaded   5" to 10"-------------------------------------------- + .06" - .12"
     
  10" and smaller------------------------------------- + .03" - .0"   12" and larger------------------------------------ + .12" - .18"
  12" and larger--------------------------------------- + .06" - .0"    
     
  Socket Weld   DEPTH OF SOCKET WELD***
     
  3" and smaller-------------------------------------- ± .01"   All Sizes-------------------------------------------- + .03" - .0"
     
  FLANGE THICKNESS   Thickness of Hub at Point of Weld Not less than 87½ % of the nominal thickness of the pipe to which the flange is to be attached.
   
  18" and smaller------------------------------------- + .12" - .0"  
  Over 18"----------------------------------------------- + .19" - .0"  
             
  FACINGS
  150 # and 300# Standard 400#, 600#, 900#, 1500# and 2500# Standard
   
  1/16" raised face is standard and is INCLUDED in the flange 1/4" raised face is standard and is ADDED to the flange
  thickness thickness  
             
*** Not covered by B16.5, added for completeness
Wester Forge