Create Optimized ASME Appendix 2 Flanges Paul Daniel
ASME Flange Design Simplified
Standard ASME B16.5 /16.47 rated flanges usually provide the most cost effective bolted connections but are not always the correct solution for the job at hand. For these cases, the more complex rules of ASME VIII-1, Appendix 2 are used to create custom flange configurations. The number of variables that must be input to produce a workable Appendix 2 flange make this a time consuming task even with software that performs the basic Appendix 2 calculations. This is where the COMPRESS Flange Wizard comes in. It creates optimized Appendix 2 (custom or body) flange designs with minimal time and effort.
In addition to the Flange Wizard, the Appendix 2 flange design dialog has a handy ASME B16.5 /16.47 flange lookup feature. This is used to quickly enter the geometry when doing an Appendix 2 analysis on a standard ASME B16.5 /16.47 rated flange. One common use for this is to re-rate an in-service flange that has had its face re-machined to remove corrosion. Note that both the COMPRESS Appendix 2 flange design and ASME B16.5 / B16.47 standard flange ratings include consideration of external loadings and comply with ASME Interpretation BPV VIII-1-16-85.
The COMPRESS Flange Wizard:
Finds a balance between bolt number and size, gasket location, hub dimensions and flange thickness with the goal of minimizing flange weight and machining time.
Provides options to use a minimum bolt size, limit the maximum bolt count and specify a minimum gasket to bolt hole clearance.
Detects and optimizes mating flange pairs.
Automatically uses the mating Appendix 2 flange bolt loads when designing ASME bolted covers.