Dimensions
Temperature
Pressure
Ratings
Pipe couplings
Flanges
Circular shape
Flange facings
Threads
Pipe fittings
Surface treatment
Inspection
Welded joints
Marking
Testing
Steels
Bolting
Link: BS EN 1092-1:2018 Flanges and their joints. Circular flanges for pipes, valves, fittings and accessories, PN designated Steel flanges
Source: BSI Standards