Liberal allowable seems to turn off for maximum expansion range cases only, in B31.1 only.

Load Cases:
23 (EXP) L23=L6-L5 - High temp expansion case
24 (EXP) L24=L7-L5 - Sub-zero cold expansion case
25 (EXP) L25=L23-L24 - Maximum Expansion Range Case

When analyzing per ASME B31.1 the code allowable stress calculated by CII for case 25 is the same with the liberal allowable turned on or off. The same system analyzed per 31.3 shows as expected a big increase in allowable stress with the liberal allowable turned on. This problem does not occur for load case 23 or 25.

Is this a software error or does B31.1 somehow require the liberal allowable to be applied differently than the basic install to hot/cold cases?

-Matt Stewart