ANSI Flanges or ASME Flanges?
Some customers call us asking for ANSI Flanges and others call us asking for ASME Flanges. We even have customers calling us to ask if there is a difference between ANSI and ASME Flanges.
In reality there is no difference. ASME is 'The American Society Of Mechanical Engineers' and ANSI is the 'American National Standards Institute'. The ANSI standards (i.e. ANSI B16.5 or ANSI B16.47) are developed by ASME working under procedures accredited by ANSI and hence these standards are adopted by ANSI to become the standards for ANSI Flanges.
Specifications for ANSI Flanges
Flanges are specified by:
Size (NPS 2", 4" etc.) - NPS is Nominal Pipe Size
Rating Class (150# or 150lb, 300# or 300lb etc.)
Pipe Wall Thickness - where applicable (SCHEDULE 40, SCHEDULE 80 etc.)
Flange Facing (Raised Face, Ring Joint Face etc.)
Flange Type (Welding Neck Flange, Blind Flange etc.)
Flange Material (ASTM A350 LF2, ASTM A182 316L etc.)
Of course on a daily basis you would not need to write all these specifications to the letter when ordering ANSI Flanges at Esbjerg Oiltool A/S. You could just write 2" 150# SCH.40 RF WN A350 LF2 and we would know exactly which flanges you need. BTW: We have those in stock.