slip on flange set back

[andersun]

I'm looking for something in print that state how to determine the proper setback on a slip on flange.
Bentley's catalogs from what I can determine use the standard wall thickness plus 1/16 of an inch. how ever a couple piping users groups answered wall thk plus 1/8 of an inch.
unless I can find an overridding answer I beleive I will default to the out of box wall thk + 1/16 when I update my catalogs.

[Zortar]

http://www.davetyner.com/forum/picture.php?albumid=6&pictureid=9
ASME B16.5 doesn't specify this value but ASME B31.3 does and it says the setback isn't that simple. It is the raised face thickness PLUS the wall thickness UP TO 1/4" maximum. See the above illustration. Since 150# and 300# flanges have a 1/16" raised face and higher ratings have a 1/8" raised face this might account for the confusion out there whether the setback is 1/16" or 1/18".

[andersun]

thanks thats what I was hoping to get a asme standard to follow. I was even thinking of buying the pipe fitter handbook to try to get better information.