ORIFICE FLANGE STANDARD

[Eabrar]

Hi
We are planning to install an orifice flange in 36" diameter line. I have the problem that i can not find any standard which deals with large dia orifice flanges. ANSI B 16.36 deals with flanges upto 24". Please let me know which standard shall i use for 36" orifice flange.
Regards

 

[unclesyd]

If you have low a pressure system we used orifice rings instead of flanges on the larger diameter lines and supposedly save a lot of money.
The following company has what they call orifice blocks which appear identical to what we used.

http://www.usaindustries.com/flowmeasurement_flanges_blocks.htm

Here is a company that makes 36" office flanges.

http://www.warrenalloy.com/home.htm