20 mm flange equivalent

[recoveringEngineer]

The following link describes the equivalent metric and NPS pipe sizes. Is there a similar link for flanges. I have (what I believe to be) a 20 mm flange, probably the equivalent of Class 300. Will a 3/4 inch Class 300 bolt up? (I can't take it apart until an outage.) All the group 1.x material of B16.5 exceed my Max working pressure of 512 @ 200 F.

http://www.extolohio.com/DATA/METRIC/metric_nominal_pipe.html

Donald Blachly, PE

 

[codeeng]

You'll need to verify the flange standard used. It may be BS or DIN and will not necessarily fit a B16.5 standard. Perhaps you have a drawing or the flange might be stamped. Here's a link showing some DIN and BS10 flanges. Also do a search for BS4504.

http://msflange.com/products.html