AutoPIPE B31.3-2014 304 material properties incorrect

Question

When selecting the B31.3-2014 material properties in AutoPIPE I get low temperature warnings at -420 F for using A312-TP304 stainless steel pipe material. The B31.3 code lists a minimum temperature for A312-TP304 as -425 F so I should not be getting this warning. 
 
 On further investigation I found that the 304 material libraries in AutoPIPE were the same for B31.3-2004 through B31.3-2012. All tables seem to have matching temperatures and coefficients of thermal expansion with the minimum temperatures corresponding to the code minimum of -425 F. The new B31.3-2014 material library has a 304 minimum temperature of -325 F and also has different coefficients of thermal expansion. 
 Can anyone at Bentely comment on what drove the change in the material library for B31.3-2014?

Mike Dattilio · Answer

Hello Eric, 
 Please see the following WIKI here. see W727-2: Temperature is outside the range specified the code for Expansion for AutoPIPE 
 Regards, 
 Mike Dattilio 
 Bentley Product Advantage Group Analyst 
 AutoPIPE Product Line Bentley Systems, Inc. 
 ===================================================

Bilal Shah · Answer

Eric, 
 
In addition to the WIKI shared by Mike below, the material grouping and table C-1 (thermal expansion pages 359-361) was revised in its entirety for 2014 edition of B31.3 piping code. The temperature intervals were also updated for the 2014 edition of B31.3. The changes in the values you are referring to are probably caused by the change in the piping code. 
 
Hope this helps.