Unfortunately, COMPRESS does not provide any references to the Australian codes.
ASME Code does not place any restrictions on location or spacing of flange bolts. However, COMPRESS includes checks on recommended minimum edge distance, bolt spacing, and wrench clearances as per the TEMA (Tubular [heat] Exchanger Manufacturers Association) Standards. A Warning will be presented if the actual bolt locations do not meet the TEMA recommendations.
Tom Barsh
Codeware Technical Support