ASME Code Case 2695 (CC 2695)
Using Division 2 Rules With Division 1 Allowable Stresses
COMPRESS includes ASME Code Case 2695 as a standard feature. Selecting this Division 1 design option directs COMPRESS to use Division 2 design by rule equations from ASME VIII-2, Part 4 with ASME VIII-1 allowable stresses. CC 2695 often produces more economical Division 1 pressure vessel designs due to the increased accuracy provided by the Division 2 design by rule equations. In the short video below we illustrate the economic benefits of using CC 2695 for a typical nozzle on a formed head. The option switch to activate CC 2695 is located in the Codes\ASME dialog.
Beginning with COMPRESS 2018, Code Case 2695 may now be activated for individual nozzles. This provides more flexibility in your designs as the parent component and other nozzles located on the parent component may now remain under Division 1 design. In addition, the 2017 Edition of ASME VIII-2 (Division 2) includes a new Class 1 pressure vessel designation that produces more economical vessels than CC 2695 in most cases.
Note that jurisdictional requirements may limit the use of Code Case 2695 and that Class 1 vessel fabrication requires an additional certificate of authorization from the ASME.